The number of coronavirus cases in the Bay Area continues to climb. Visit our coronavirus page and live blog for more coverage. A county-by-county breakdown of the cases announced by officials can be viewed below.
TUESDAY, APRIL 21 UPDATE
- Santa Cruz County announced two new cases for a total of 108.
- San Francisco reported 15 new cases, bringing its total to 1,231.
- San Mateo County is up to 935 cases with 15 new ones.
Santa Clara County
There are at least 1,922 coronavirus cases confirmed in Santa Clara County.
April 20 – Santa Clara County is up to 83 COVID-19 deaths and 1,922 confirmed cases.
April 17 – Santa Clara County’s COVID-19 death toll has increased to 73 with four additional deaths. The county’s case count is up to 1,870 with 37 new cases being announced.
April 16 – Santa Clara County reported four more COVID-19 deaths for a total of 69 and 40 new cases for a total of 1,833.
April 15 – Santa Clara County is up to 65 COVID-19 deaths and 1,793 confirmed cases.
April 13 – Santa Clara County announced six new COVID-19 deaths for a total of 60 and 45 new cases for a total of 1,666.
April 12 – Santa Clara County reports 55 new cases of coronavirus, and 3 more deaths.
April 11 – Santa Clara County has reported 82 new cases and one new death, bringing the totals to 1,566 and 51.
April 10 – Santa Clara County reported 42 new coronavirus cases and three new deaths, bringing the total numbers to 1,484 cases and 50 deaths.
April 9 – Santa Clara County reported 62 new coronavirus cases and one new death, bringing the total numbers to 1,442 cases and 47 deaths.
How Coronavirus Has Grown in Each State — in 1 Chart
New York has quickly become the epicenter of the American coronavirus outbreak. This chart shows the cumulative number of cases per state by number of days since the 10th case.
Source: The COVID Tracking Project
Credit: Amy O’Kruk/NBC
April 8 – Santa Clara County announced three additional COVID-19 deaths, raising the county death toll to 46. The county also announced 95 new cases for a total of 1,380.
April 7 – Santa Clara County announced one more COVID-19 death for a total of 43 and 61 new cases for a total of 1,285.
April 6 – Santa Clara County reported three additional COVID-19 deaths for a total of 42 and 17 new cases for a total of 1,224.
April 5 – Santa Clara County reports 59 new cases of coronavirus, raising the total to 1,207.
April 4 – Santa Clara County has 54 new cases for a total of 1,148 cases in the county, officials announced. The county also announced its 39th coronavirus-related death.
April 3 – Santa Clara County reported two new COVID-19 deaths, raising the death toll to 38. The county also reported 75 new cases, bringing the county case count to 1,094.
April 2 – Santa Clara County announces four additional COVID-19 deaths for a total of 36 and 63 new cases for a total of 1,019.
A USPS employee at the Hillview Post Office in San Jose tested positive for coronavirus. USPS said it has reached out to Santa Clara County health officials and following guidance provided.
April 1 – Santa Clara County reported two additional deaths for a total of 32 and 66 new cases for a total of 956.
The Santa Clara County Sheriff’s Office reported 11 employees with COVID-19, including a patrol deputy and eight deputies in custody bureau.
March 31 – Santa Clara County announced 42 new coronavirus cases for a total of 890 and two additional deaths for a total of 30.
March 30 – Santa Clara County reported three additional coronavirus-related deaths for a total of 28 and 202 new cases for a county total of 848. The county stressed that some of the new cases were not previously reported over the past two days. “This increase reflects a reporting delay, not necessarily a significant single day increase,” the public health department said in a statement.
March 29 – Santa Clara County officials report 55 new cases, raising the total to 646.
March 28 – Santa Clara County reported 17 new cases and five additional deaths from the coronavirus, bringing the total number of cases to 591 and the total number of deaths to 25.
Santa Clara County announced its 20th coronavirus-related death and 32 new cases for a county total of 574.
March 26 – Santa Clara County announced 83 new coronavirus cases, bringing the county total to 542. The county also reported two additional deaths from the virus, raising the county death toll to 19.
The Santa Clara County Sheriff’s Office now has a sixth confirmed case of COVID-19. Officials say the deputy was assigned to the Custody Bureau and was one of the three deputies who were previously identified as potential exposures during the Sheriff’s Office contact tracing.
March 25 – Santa Clara County announced 84 new cases, bringing the county total to 459. The county also reported another death, raising the county death toll to 17.
Half of the patients at Kaiser Permanente’s San Jose facility have tested positive for COVID-19 or are showing symptoms of the virus, Kaiser’s Executive Vice President Stephen M. Parodi said in an interview with JAMA Network.
The Santa Clara County Sheriff’s Office said it now has five confirmed coronavirus cases among its staff.
March 24 – Santa Clara County reported three more coronavirus-related deaths, bringing the county’s death toll to 16. The county also reported 54 new cases for county total of 375.
The Santa Clara County Sheriff’s Office confirms four cases of COVID-19 in the department.
March 23 – The Santa Clara County Public Health Department announced three new deaths from COVID-19, bringing the total number of deaths to 13 in Santa Clara County. The county’s total number of confirmed cases also increased to 321.
A San Jose FoodMaxx is shut down for cleaning after an employee who tested positive for COVID-19 died
The Santa Clara County Sheriff’s Office announced three confirmed coronavirus cases amongst its staff. Two deputies are self-quarantining at home. One deputy is in stable condition at a local hospital.
A Santa Clara County Jail inmate has tested positive for coronavirus. The inmate is quarantined and is being closely monitored by medical staff. SJPD notified of the possible exposure to initial arresting officers.
The Milpitas Fire Department says two firefighters and one family member have tested positive for the novel coronavirus. All three are in self-quarantine at home. They have not been hospitalized.
March 22 – Santa Clara County’s Director of Communications and Public Affairs has tested positive and is in self-isolation. This case is one of the cases previously reported.
Santa Clara County reports 39 new cases of coronavirus, raising the total to 302. The county also reported two more deaths, raising the total number of deaths to 10. The ninth death was a woman in her 60s. The 10th death was a woman in her 40s. Both died on Saturday.
The county now has a total of 302 confirmed cases and 10 deaths due to coronavirus.
March 21 – San Jose Police have confirmed that one of their reserve officers has tested positive for COVID-19. It is not yet clear if the case was already included in Santa Clara County’s total of 263 cases.
Santa Clara County announces a total of 263 confirmed cases of coronavirus.
March 20 – Santa Clara County announced two more deaths from COVID-19, raising the county death toll to eight. One of the deceased was a man in his 80s. He was hospitalized on March 3 and died on March 17. The other person who died was a man in his 70s. The county also reported seven new cases, bringing the county total to 196.
March 19 – Santa Clara County announces 14 new cases. The county total now stands at 189.
March 18 – Santa Clara County health officials announced that there are now 175 confirmed cases in the county.
County health officials also confirmed the sixth death of COVID-19 in the county. The case was an adult male in his 60s who was hospitalized on March 5 and passed away March 17.
March 17 – San Jose State University announced an off-campus student has been diagnosed with coronavirus. The student is recovering at home.
Santa Clara County reports another coronavirus-related death. This is the county’s fifth death reported due to coronavirus.
The county also reports 17 new cases, bringing the county total up to 155.
March 16 – Santa Clara County confirms a total of 138 cases of coronavirus.
Officials announced two more coronavirus-related deaths bringing the total number of deaths in the county to four. One patient was in his 80s and the other in his 50s.
A Santa Clara police officer tested positive for coronavirus, the department said. He last worked March 9 and is self-isolating for 14 days. It is unclear how he was infected.
San Jose Fire Department now says 10 sworn personnel have tested positive for coronavirus and 57 others who may have been exposed are being monitored.
Gilroy Mayor Roland Velasco announced that a coronavirus patient died. This brings the number of COVID-19 related deaths in Santa Clara County to three.
March 15 – Santa Clara County announced 23 new cases of coronavirus, bringing the total amount to 114.
March 14 – Santa Clara County announced 12 new cases of coronavirus in the county. This brings the total amount of cases to 91.
March 13 – A second person in Santa Clara County has died from the novel coronavirus, the county health department announced. The person was a woman in her 80s.
Dr. Sara Cody, Santa Clara County Public Health Officer, says there are now 79 cases in the county.
In San Jose, officials now say eight sworn personnel have tested positive for coronavirus. Authorities are also tracking status of 46 other employees who may have been exposed.
March 12 – The San Jose Sharks have announced that a part-time employee at the SAP Center has tested positive for the coronavirus. The team has confirmed that the person last worked at the SAP Center in San Jose on March 3. The employee is now self-quarantined. It is not known if this person has been counted Santa Clara County’s total of 66, or if the person is from Santa Clara County.
The Santa Clara County Public Health Department announced 18 new cases, bringing the county total to 66.
Four San Jose firefighters have tested positive for the coronavirus, according to the firefighters union, and at least 77 fellow fire department colleagues have been placed under quarantine, officials confirmed.
March 11 – Three new cases of coronavirus announced by officials in Santa Clara County.
March 10 – Santa Clara County now has 45 confirmed cases after announcing an additional two cases.
March 8 – Officials in Santa Clara County announced five new confirmed cases, bringing the county’s total to 37. In a tweet, officials emphasized that having new cases is not unexpected.
The Centers for Disease Control and Prevention announced that the Gilroy patient suspected of having coronavirus tested negative for the virus. The Gilroy Police Department released a statement you can read here.
Fire officials in Gilroy reported that a resident tested positive for coronavirus on Thursday. This is Gilroy’s first reported case of the virus, but it was not immediately clear if that case was already counted in Santa Clara County’s total of 32 confirmed cases.
Gilroy firefighters came into contact with the patient, who had been experiencing chest pain before testing positive for the virus, city officials said. The firefighters are symptom free and are allowed to remain at work.
March 6 – Health officials confirmed four new cases in the county: a man who is a household contact of a previously confirmed case who is now under home isolation, a female who is hospitalized, a hospitalized male who recently traveled to India, and a male who is isolated at home.
Stanford University announced a case among its faculty members. The person, who works in a clinic, has not been at work since experiencing symptoms, school officials said. The clinic has been closed for cleaning and all people who may been exposed to the faculty member have been advised to self-isolate. It is not immediately known if this case is a new or existing case in the county.
March 5 – Health officials announced six new cases, bringing the county total up to 20 confirmed cases. The six new cases announced by health officials include three women and three men.
In addition, Lockheed Martin announced a case among its Sunnyvale employees. It was not immediately known if this case is a new or existing case in the county.
Authorities also said seven cases in the county have no known travel history to impacted countries or have had any known contact with an infected person.
March 4 – Officials announced a man is hospitalized after contracting the virus. How he was exposed is under investigation. In addition, two other men are in isolation at home after being in close contact with a previous case.
March 3 – Two cases confirmed: a woman and man. Both are hospitalized and how they contracted the virus is under investigation.
March 2 – Two additional cases announced: a man who had household contact of a confirmed case in another county, and a man who is a a household contact of a previous case in the county. Both men are under home isolation.
March 1 – Three new cases confirmed: A woman with chronic health conditions who is hospitalized, and a husband and wife. The couple is hospitalized and recently traveled to Egypt.
Feb. 29 – A woman who is a household contact of a previous case now confirmed to have the virus.
Feb. 28 – Officials confirm new case of a woman. She did not have a travel history or any known contact with anyone infected.
Feb. 2 – Woman who traveled to Wuhan, China, confirmed to have coronavirus. She had been self-isolating at home and was never hospitalized.
Jan. 31 – Man who traveled to Wuhan, China, and had been self-isolating at home. (Update: The man has fully recovered and released from isolation)
San Francisco
There are at least 1,231 confirmed cases in San Francisco.
April 21 – San Francisco reported 15 new cases, bringing its total to 1,231.
April 20 – San Francisco reported 59 additional cases, raising its total to 1,216.
April 19 – San Francisco officials report 20 new cases of coronavirus, raising the total amount of cases to 1,157
April 18 – San Francisco officials report 79 new cases of coronavirus, raising the total to 1,137.
April 17 – San Francisco reported three more COVID-19 deaths for a total of 20 and 39 new cases for a total of 1,058.
April 16 – San Francisco reported six new cases, bringing its total to 1,019.
April 15 – San Francisco reported two additional COVID-19 deaths, bringing the city and county’s death toll to 17. It also crossed 1,000 confirmed cases with 26 new ones. The new case count is 1,013.
April 14 – San Francisco reported 30 additional cases, raising the city and county’s total to 987.
April 13 – San Francisco reported its 15th COVID-19 death and 85 new cases for a city and county total of 957.
April 12 – Authorities confirm 15 new cases of coronavirus and one more death. The total now is 872 confirmed cases of coronavirus and 14 deaths.
April 11 – San Francisco reports 60 new cases, raising the total to 857.
April 10 – San Francisco reported three additional COVID-19 deaths for a total of 13 and 73 new cases for a total of 797.
April 9 – San Francisco reported 48 new cases, raising the city and county total to 724.
April 8 – San Francisco reported its tenth COVID-19 death and 54 new cases for a total of 676.
April 7 – San Francisco reported 39 new cases for a city and county total of 622.
April 6 – San Francisco reported its ninth COVID-19 death and 15 new cases for a total of 583.
April 5 – San Francisco now has a total of 568 confirmed cases of coronavirus.
April 4 – San Francisco reported its eighth coronavirus-related death as well as 32 new cases, bringing the city and county total to 529.
April 3 – San Francisco reported 47 new coronavirus cases, bringing the city and county total to 497.
April 2 – San Francisco announced 16 new COVID-19 cases, raising the city and county total to 450.
San Francisco also confirmed its first case of COVID-19 at a homeless shelter. More details here.
April 1 – San Francisco reported its seventh COVID-19 death and 37 new cases, bringing the city and county total to 434.
March 31 – San Francisco reported 23 new cases for a city and county total of 397.
March 30 – San Francisco reported its sixth coronavirus-related death. The city and county also reported 34 new cases, raising the total to 374.
March 29 – There are 32 new coronavirus cases, raising the total number of cases to 340. Another death was reported, bringing the total number of deaths to five.
March 28 – There are now a total of 308 confirmed cases of coronavirus and four deaths in the county.
March 27 – San Francisco announced its third coronavirus-related death and an additional 56 confirmed cases for a total of 279.
March 26 – San Francisco reported its second coronavirus-related death and an additional 45 cases for a new city and county total of 223.
March 25 – The city and county of San Francisco announced 26 new confirmed cases for a total of 178.
A total of five employees at San Francisco’s Laguna Honda Hospital have tested positive for coronavirus.
The San Francisco Sheriff’s Office announced that four more staff have tested positive for the novel coronavirus.
In the San Francisco Police Department, the partner of a sergeant confirmed with coronavirus has also tested positive for COVID-19, according to the police union.
San Francisco Municipal Transportation Agency confirmed an employee has tested positive for COVID-19.
March 24 – San Francisco announced its first coronavirus-related death. The resident who died was a man in his 40s who had “multiple, significant underlying health conditions,” according to the mayor’s office.
The city and county of San Francisco is up to 152 confirmed cases after announcing 21 new cases.
The San Francisco Police Department announced a sergeant has tested positive for coronavirus. The sergeant was assigned to the SFPD Special Victims Unit at the Hall of Justice.
March 23 – The number of confirmed coronavirus cases in the city and county of San Francisco has climbed to 131.
The University of San Francisco announced that there are two confirmed cases among “members of our USF community.” The two people haven’t been on campus for at least two weeks. They are at home recovering.
At least one member of the care staff at San Francisco’s Laguna Honda Hospital has tested positive for COVID-19, officials say.
March 22 – A San Francisco County Sheriff’s deputy assigned to a jail has tested positive for coronavirus. Officials said that there are no confirmed cases among inmates at this time.
San Francisco officials announce 24 new cases in the city, bringing San Francisco’s total number of cases to 108.
March 21 – Officials announce a total of 84 cases in the city and county.
March 20 – San Francisco announces six new cases for a city and county total of 76.
March 19 – Officials announce 19 new cases in San Francisco, bringing the city and county total to 70.
March 18 – San Francisco now has 51 confirmed cases in the city and county.
March 17 – San Francisco officials announce three new confirmed cases, bringing the city and county total to 43.
March 16 – San Francisco officials announce three new cases of coronavirus, bringing the city and county’s total to 40.
March 15 – San Francisco authorities report nine new cases of coronavirus.
March 14 – An Alaska Airlines customer service agent who worked at San Francisco International Airport tested positive for coronavirus after leaving work on March 10, the airline announced. According to a spokesperson from the airline, the employee is in quarantine and recovering. It is not believed that the employee had prolonged exposure to any customers. Other employees who had exposure to the person are self-isolating, the spokesperson said.
Officials confirmed five new cases of coronavirus in the city and county. This brings the total number of cases to 28.
March 13 – Officials announce five new cases, bringing the city and county’s total to 23.
March 12 – Officials announce four new cases. Two are hospitalized. Two are isolated at home. One of the cases had close contact with a confirmed case. The other three appear to have been infected via community spread.
March 10 – San Francisco officials confirm another case of coronavirus in the city, bringing the total amount of cases to 14.
March 9 – The San Francisco Department of Emergency announced five new cases of coronavirus have been reported in the city and county. This person has had known contact with a person confirmed to have COVID-19.
March 7 – San Francisco announced six residents of the city were in contact with someone confirmed to have COVID-19. These six residents were reported presumptive positive for coronavirus and are now in isolation at home.
March 6 – The FBI San Francisco Division said an employee has been diagnosed with coronavirus. Here’s a statement from the FBI: “This employee works in a small satellite office. The other employees at the site have returned to their homes until further notice, and everyone known to have been in contact with the infected employee has been notified of possible exposure. The FBI has contacted local health officials as well as the Centers for Disease Control, and the Bureau will take all necessary remedial and precautionary measures to protect our employees, their families and our community. At this time, we assess our operations have not been negatively impacted by COVID-19, and we will continue steadfast in our mission to protect the American people and uphold the Constitution.”
March 5 – San Francisco Mayor London Breed announced the city’s first two cases. The two patients, both hospitalized, appear to have been infected via community spread.
Alameda County
There are at least 1,193 confirmed cases in the county, including the city of Berkeley. One of the cases, however, is a presumptive positive case involving a health care worker who had exposure to a confirmed case in Solano County.
April 20 – Alameda County, including the city of Berkeley, is up to 1,193 confirmed cases.
April 19 – Alameda County has reported one new COVID-19 death, bringing the total number of deaths to 42.
Alameda County officials report 50 new cases of coronavirus, raising the total amount of cases to 1,164
April 18 – Alameda County officials report a total of 1,114 cases of coronavirus in the county. Officials also reported one more death, raising the total number of deaths to 41.
April 17 – Alameda County reported its 40th COVID-19 death. The county, including the city of Berkeley, also announced more cases. The total is up to 1,063.
April 16 – Alameda County reported three more COVID-19 deaths, raising its death toll to 39. The county also became the third Bay Area county to surpass 1,000 confirmed cases. The case count for the county, including the city of Berkeley, is now at 1,009.
April 15 – Alameda County’s COVID-19 death toll has increased from 23 to 36. The county, including the city of Berkeley, is up to 964 confirmed cases.
April 13 – Alameda County, including the city of Berkeley, is up to 888 confirmed cases.
April 12 – Alameda County reports 37 new cases of coronavirus and two more deaths.
April 11 – Alameda County has announced 38 new cases and one new death, bringing the totals for the county to 808 cases and 21 deaths.
Alameda County reported two new cases, raising the county’s total number of coronavirus cases to 770.
April 10 – Alameda County reported three new coronavirus-related deaths for a total of 20 and added 49 new cases for a total of 768.
April 9 – Alameda county officials announced 41 new cases for a total of 715.
Berkeley reported its first COVID-19 death.
April 8 – Alameda County reported its 16th COVID-19 death. The county, including the city of Berkeley, also reported 40 new cases for a total of 674.
Six infected residents have died following a COVID-19 outbreak at a Hayward nursing home. In addition, at least 29 other residents and 24 staff members at Gateway Care and Rehab Center have tested positive for coronavirus. Details here.
The Alameda County Sheriff’s Office reports eight new inmates at Santa Rita Jail in Dublin have COVID-19, bringing the total to 11.
April 7 – Alameda County reported two more COVID-19 deaths, raising the county death toll to 15. The county, including the city of Berkeley, is up to 634 total cases with 46 new ones being announced.
Three inmates at Santa Rita Jail in Dublin have tested positive for the novel coronavirus. Details here.
April 6 – Alameda County reported an additional COVID-19 death for a total of 13. The county, including the city of Berkeley, also announced a total of 588 coronavirus cases.
April 5 – Alameda County reported 27 new cases for a countywide total of 566.
Alameda County officials report two new cases, raising the total to 539.
April 4 – Alameda County officials reported 94 new cases, for a total of 537.
April 3 – Alameda County reported three additional COVID-19 deaths. The county, including the city of Berkeley, also announced 47 new cases for a total of 443.
April 2 – Alameda County and the city of Berkeley are up to 396 total coronavirus cases. The county also reported an additional COVID-19 death, bringing the death toll to nine.
April 1 – Alameda County, including the city of Berkeley, is up to eight COVID-19 deaths and 359 confirmed cases.
March 31 – Alameda County, including the city of Berkeley, is up to 313 confirmed cases.
March 30 – There are now 283 confirmed cases in Alameda County and the city of Berkeley.
March 29 – Alameda County, including the city of Berkeley, is up to 270 confirmed cases. The county death toll increased by one to seven.
March 28 – Alameda County officials confirmed 20 new cases for a countywide total of 240, and two new coronavirus-related deaths for a total of six.
March 27 – There are now 220 confirmed coronavirus cases in Alameda County, including the city of Berkeley.
March 26 – Alameda County reported two more coronavirus-related deaths, raising the county’s death toll to four. The county’s confirmed coronavirus case total also increased to 178. This number includes 14 total cases in Berkeley.
March 25 – A gate agent at Oakland International Airport has tested positive for COVID-19.
March 24 – Alameda County reported its second coronavirus-related death. The county’s number of confirmed coronavirus cases increased to 124. The city of Berkeley, which is not included in the county’s total, reported 11 total cases.
March 23 – The Alameda County Public Health Department announced the county’s first death from COVID-19. The person who died was elderly and had underlying conditions. The health department also reported that the county is up to 112 coronavirus cases. The city of Berkeley, which is not included in the county’s total, reported 10 cases.
March 22 – Alameda County officials confirm a total of 106 cases of coronavirus in the county.
March 21 – Officials with the city of Berkeley and the County of Alameda have announced 26 new cases, bringing the total number of cases in the county to 71.
Sunrise Senior Living home in Pleasanton has confirmed that it has a case of coronavirus. It is not known if this case has already been counted in Alameda County’s total of 45 cases.
March 20 – Alameda County is now at 45 confirmed cases, with 10 new cases being announced.
March 19 – Alameda County reports 35 total cases in the county.
March 18 – Alameda County reports that there are now 31 confirmed cases in the county.
March 17 – Alameda County reports six new cases, with the county total now climbing to 27.
March 16 – Authorities confirm three more cases of coronavirus in Alameda County, bringing the total to 21.
March 15 – Officials in Alameda County have announced five new coronavirus cases, bringing the county total to 18.
March 14 – A UC Berkeley grad student has tested positive for coronavirus, school officials said. The student is self-isolating in their home that is not on campus or in the city of Berkeley.
March 13 – Alameda County Public Health Department confirms four new positive cases of coronavirus. Two of the four cases are the first incidence of community-acquired transmission in the county. Alameda County now has a total of 11 cases.
March 12 – The county health department reported four new cases, bringing the county total to seven. Two of the cases appear to have been infected via community spread. The other two cases are linked to other confirmed cases.
March 10 – Health officials announce a new case, bringing the total to three confirmed coronavirus cases in Alameda County. The individual is the spouse of the second confirmed case, and is an older adult, who had disembarked from the Grand Princess cruise ship in February (11th-21st). This individual had already been quarantined at home and remains isolated.
March 6 – Alameda County Public Health Department reports another case of coronavirus. Officials said the patient was aboard the Grand Princess. The case is an older adult who has underlying medical conditions. The individual is hospitalized and their family members are in quarantine.
March 3 – Berkeley health officials announce the city’s first confirmed case of coronavirus — a resident who recently traveled abroad.
Contra Costa County
There are at least 707 cases in the county.
April 20 – Contra Costa County reported two more COVID-19 deaths, raising its death toll to 22. The county also reported 14 new cases for a total of 707.
April 19 – Contra Costa County officials report eight new cases of coronavirus and one new death. The total number of cases is now 693 with 20 deaths.
April 18 – Contra Costa County officials report 37 new cases of coronavirus, raising the total to 685.
April 17 – Contra Costa County announced three additional COVID-19 deaths, raising its total to 19. The county also reported 17 new cases for a total of 648.
April 16 – Contra Costa County reported two additional COVID-19 deaths, raising the county death toll to 16. The county also reported 16 new cases for a total of 631.
April 15 – Contra Costa County announced two additional COVID-19 deaths for a total of 14 and 15 new cases for a total of 615.
April 14 – Contra Costa County reported 48 new cases, raising the county total to 600, and one new death, raising the total to 12.
April 13 – Contra Costa County reported 13 new cases, raising the county total to 552.
April 12 – Contra Costa County now has a total of 539 cases of coronavirus.
April 11 – Contra Costa County reports a total of 11 deaths and 530 confirmed cases of coronavirus.
April 10 – Contra Costa County reported its ninth COVID-19 death and 27 new cases for a total of 511.
April 9 – Contra Costa County reported its eighth COVID-19 death and 22 more cases for a total of 484.
April 8 – Contra Costa County reported 20 new cases for a total of 462.
April 7 – Contra Costa County reported 25 new cases, raising the county total to 442.
April 6 – Contra Costa County announced its seventh COVID-19 death and 31 new cases, bringing the county case count to 417.
April 5 – Contra Costa County reported 33 new cases for a total of 386 and one new death, making the total for the county six coronavirus-related deaths.
April 4 – Contra Costa County announced 46 new coronavirus cases for total of 353.
April 3 – Contra Costa County announced two additional COVID-19 deaths for a total of five and 31 new cases for a total of 307.
April 2 – Contra Costa County is up to 276 coronavirus cases after announcing 26 new cases.
April 1 – Contra Costa County announced 28 new cases for a county total of 250.
March 31 – Contra Costa County reports 35 new cases, raising the county’s total to 222.
March 30 – Contra Costa County reports an additional 12 cases for a county total of 187.
March 29 – Contra Costa County officials have confirmed seven new cases for a countywide total of 175 cases.
March 28 – Contra Costa County announced 17 new coronavirus cases and one new death, bringing the totals to 168 cases and three deaths.
March 27 – Contra Costa County has announced its second COVID-19 related death and four new cases, bringing the county’s total number of cases to 151.
Contra Costa County announced 16 new cases for a county total of 147.
March 26 – Contra Costa County reports 23 new cases, bringing the county total to 131.
March 25 – Contra Costa County reports 22 new cases for a county total of 108.
March 24 – Contra Costa County reported 15 new cases for a county total of 86.
March 23 – Contra Costa County is up to 71 confirmed coronavirus cases.
March 22 – Health officials announce 10 new cases of coronavirus, bringing the county’s total to 61.
March 21 – Contra Costa County officials announce a total of 51 cases of coronavirus.
March 20 – Contra Costa County confirmed its first death linked to COVID-19. The patient died in a hospital in Contra Costa County. The Contra Costa County resident was in their 70s and had a pre-existing condition that put them at higher risk of serious illness from COVID-19, and a history of recent overseas travel, officials said. The county also reported four additional cases, raising the county total to 46.
March 19 – Contra Costa County announces another case, bringing the county total to 42.
March 18 – Contra Costa County reports 41 confirmed cases in the county.
March 17 – Contra Costa County announces five new cases. The county total is now 39.
March 16 – Contra Costa County officials announced that the total number of confirmed cases is at 34.
March 13 – Contra Costa Health Services announced there are now 25 total cases in the county.
March 12 – Contra Costa County Health Services now says the county has a total of 16 cases.
March 10 – Officials announce an additional presumptive positive case.
March 8 – Contra Costa Health Services officials confirmed five new cases of coronavirus in the county. Our previous number of cases in the county was 12, which had included three evacuees from Travis Air Force Base in Fairfield.
March 6 – County health officials announce three new cases. Two of the patients were passengers aboard the Grand Princess cruise ship and one is known to have had close contact with a COVID-19 patient in another jurisdiction. They are all isolated in their homes.
March 3 – County health officials announced the first local confirmed case of coronavirus. Officials said the resident is being treated at a local hospital, did not travel to recently impacted countries, and had no known contact with an infected person.
San Mateo County
There are at least 935 cases reported in the county.
April 21 – San Mateo County is up to 935 cases with 15 new ones.
April 20 – San Mateo County announced 82 new cases for a total of 920.
April 18 – San Mateo officials report 41 new cases of coronavirus, raising the total to 838.
April 16 – San Mateo County has reported 30 new cases, bringing the total to 797.
April 15 – San Mateo County reports 20 new cases and seven new deaths.
April 14 – San Mateo County reported 26 new cases, bringing the county’s total to 747.
April 13 – San Mateo County is up to 721 confirmed cases.
April 11 – San Mateo County reports a total of 652 confirmed cases of coronavirus.
April 10 – San Mateo County announced five new cases for a total of 638.
April 9 – San Mateo County added 16 new cases for a total of 633.
April 8 – San Mateo County reported 28 new cases, raising the county total to 617.
April 7 – San Mateo County announced eight additional COVID-19 deaths for a total of 21 and 10 new cases for a total of 589.
April 6 – San Mateo County announced 24 new cases, raising the countywide total to 579.
April 5 – San Mateo County reports a total of 555 cases of coronavirus.
April 4 – San Mateo County reported 52 new coronavirus cases, bringing the total number of cases in the county to 538.
April 3 – San Mateo County reported three additional COVID-19 deaths for a total of 13 and 33 new cases for a total of 486.
April 2 – San Mateo County reported 65 new coronavirus cases for a total of 453.
April 1 – San Mateo County reported 79 new cases for a countywide total of 388.
March 31 – San Mateo County announced four additional coronavirus-related deaths, bringing the county death toll to 10.
March 30 – San Mateo County announced 32 new cases, bringing the county total to 309.
March 29 – Authorities confirm more new cases, raising the total to 277.
March 27 – San Mateo County reported its sixth coronavirus-related death and 44 new cases for a total of 239.
March 26 – San Mateo County announced 30 new cases for a county total of 195.
A first responder with the San Mateo Consolidated Fire Department has tested positive for COVID-19. Officials say the infected employee is recovering at home and has not been hospitalized.
March 25 – The number of coronavirus cases in San Mateo County is now at 165 — up from 161 the previous day. The county also reported four additional deaths from the disease, bringing the county death toll to five.
March 24 – San Mateo County reports 19 new cases for a total of 161.
March 23 – San Mateo County says it now has 142 confirmed coronavirus cases.
March 22 – San Mateo County officials announce seven new cases, bringing the county’s total to 117.
March 21 – San Mateo County reports 10 new cases, bringing the total to 110.
March 20 – San Mateo County reports 11 new cases, bringing the county total to 100.
March 19 – San Mateo County is up to 89 confirmed coronavirus cases.
March 18 – San Mateo County reported 16 new cases of coronavirus, bringing the total number to 80.
March 17 – San Mateo County health officials reported 22 new cases of coronavirus, raising the total number to 64.
March 16 – San Mateo County updated its number of coronavirus cases from 32 to 42, including one death.
March 14 – San Mateo County health officials have reported an increase in coronaviurs cases, bringing the total to 32. All gatherings of over 50 people are now banned.
March 12 – San Mateo County Health officials now say the county has 20 cases.
March 11 – San Mateo County Health officials said there are now a total of 15 positive cases of coronavirus reported in the county.
March 9 – Officials now say there are nine cases in the county: five adult cases are presumptive positive and awaiting CDC confirmation, four adult cases that have been confirmed by the CDC.
March 2 – Officials said a resident is presumptive positive for the coronavirus and the case is pending confirmation from the Centers for Disease Control and Prevention (CDC).
Feb. 27 – The CDC transferred a confirmed case of a repatriated patient to the county. Officials are not releasing any further information.
Solano County
There are at least 180 cases in the county.
April 20 – Solano County reported 11 new cases for a total of 180.
April 17 – Solano County reported 13 new cases for a total of 169.
April 16 – Solano County has announced 15 new cases for a total of 156.
April 15 – Solano County announced one additional case for a total of 141.
April 14 – Solano County reported five additional cases, bringing its total to 140.
April 13 – Solano County reports 14 new cases, bringing the county total to 135.
April 10 – Solano County reported six new cases for a total of 121.
April 9 – Solano County reported three new cases for a total of 115.
April 8 – Solano County reported 13 new cases for a total of 112.
April 7 – Solano County reported its second COVID-19 death and 11 new cases for a total of 99.
April 6 – Solano County announced 15 new cases for a total of 88.
April 3 – Solano County reported 12 new cases, bringing the total in the county to 73.
April 2 – Solano County reported its first COVID-19 death and seven news cases for a total of 61. Officials say the resident who died was 85 years old, recently traveled out of the country, and had multiple severe underlying health conditions.
April 1 – Solano County added five new cases, bringing its total to 54.
March 31 – Solano County is up to 49 total cases with the addition of six new cases.
March 30 – Solano County is up to 43 confirmed cases.
March 26 – Solano County has reported a total of 34 cases.
March 25 – Solano County announces seven new cases, bringing the total number of confirmed cases to 31.
March 24 – Solano County officials announce three new confirmed coronavirus cases, bringing the total to 24.
March 23 – A Vallejo police officer has tested positive for the novel coronavirus, according to the police department. The officer traveled internationally earlier this month. When he returned, he was directed to self-quarantine. He has not been to the police department since returning from his trip. He continues to self-quarantine at home. His symptoms are said to be mild.
March 21 – Solano County officials have a total of 14 confirmed cases of coronavirus so far.
March 20 – Solano County adds three new cases for a county total of 13.
March 19 – Solano County announces that there are now 10 confirmed cases in the county.
March 16 – Solano County has a total of seven cases of coronavirus, plus two Travis Air Force Base cases confirmed through their Facebook page.
March 15 – Health officials in Solano County announced a new case of coronavirus, bringing the total to seven. The person is an adult dependent of a service person at Travis Air Force Base and became infected due to community exposure, officials said.
March 9 – Solano County Public Health says the county now has six confirmed cases.
March 7 – Solano County officials report at least three confirmed cases in the county. Our previous number of cases in the county was eight, which had included evacuees from Travis Air Force Base in Fairfield.
Feb. 28 – A health care worker is being called a presumptive positive case after being in contact with a Vacaville woman infected with the virus.
Feb. 26 – A Vacaville woman is believed to be the first United States case with an unknown origin. She is being treated at UC Davis Medical Center.
Sonoma County
There are at least 182 cases in the county, including a patient transferred from Travis Air Force Base.
April 20 – Sonoma County reported one new case, bringing the total to 182.
April 19 – Sonoma County has reported a new case, bringing the total to 181.
April 17 – Sonoma County has reported nine new coronavirus cases, bringing the total to 180.
April 16 – Sonoma County has reported nine new coronavirus cases, bringing the total to 171.
April 15 – Sonoma County reports three new cases, bringing the county’s total to 163.
April 14 – Sonoma County reported eight new cases, bringing the county’s total to 160.
April 13 – Sonoma County reported five new cases, bringing the county’s total to 152.
April 12 – Sonoma County is up to 147 confirmed cases.
April 10 – Sonoma County reported three new cases and one new death bringing the county’s totals to 145 cases and two deaths.
April 9 – Sonoma County is up to 142 confirmed cases.
April 8 – Sonoma County announced 16 additional cases, raising the county total to 136.
April 7 – Sonoma County added five new cases, bringing the county total to 120.
April 6 – Sonoma County added four new cases, bringing the county total to 115.
April 5 – Sonoma County reported four more cases, raising the county total to 111.
April 4 – Sonoma County announced two new cases for a total of 107.
April 3 – Sonoma County reported five new cases, bringing the total to 105.
Sonoma County reported five additional cases for a countywide total of 100.
April 2 – Sonoma County reported four new cases for a total of 95.
April 1 – Sonoma County reported six new cases, raising the county total to 91.
March 31 – Sonoma County reports 12 new cases, raising the county total to 85.
Santa Rosa police say a detective has died from COVID-19. Chief Rainer Navarro identified the detective as Marylou Armer, who served in the department for 20 years. Updates on this story here.
March 30 – Sonoma County announces 15 new cases, bringing the county’s total to 73.
March 29 – Sonoma County officials announce four new cases, raising the total to 58.
March 27 – Sonoma County has announced an additional four cases for a total of 54.
Sonoma County announces an additional case for a county total of 50.
Santa Rosa Police Department announced two more employees tested positive for COVID-19. The department now has a total of five employees with coronavirus.
March 26 – Sonoma County has reported a total of 49 cases.
Sonoma County’s case total rises to 44 with five new cases being announced.
March 25 – Sonoma County reports two new cases. The total for the county is now at 39.
Sonoma County reports three new cases for a county total of 37.
March 24 – Sonoma County announces five new cases, bringing the county’s total to 34.
March 23 – Sonoma County reports 29 total coronavirus cases in the county.
March 22 – Sonoma County’s coronavirus case count is now at 27.
March 21 – Sonoma County officials confirm a total of 24 cases of coronavirus.
March 20 – Sonoma County reports three new cases. This brings the county’s total to 11.
March 18 – The number of cases in Sonoma County has increased to eight.
March 16 – Sonoma County officials confirm one more case of coronavirus, bringing the county’s total to 6.
March 15 – The Department of Health Services in Sonoma County confirmed a new case of coronavirus spread through community exposure. This case brings the county’s total number of cases to five. It is the second case reportedly spread by an unknown source.
March 14 – Health officials in Sonoma County announced a new case of the coronavirus. This is the county’s first case of infection from community exposure and brings the county total to four.
March 5 – A presumptive positive case announced involving a Santa Rosa resident who traveled on the Grand Princess cruise ship from San Francisco to Mexico.
March 2 – Officials announced a presumptive positive case involving an individual who was on a sea cruise between San Francisco and Mexico.
Napa County
There are at least 48 cases reported in the county.
Two patients announced earlier in the county, both of which were tied to evacuees from Travis Air Force Base, have been transferred to facilities outside of the Bay Area.
April 20 – Napa County reported one additional case for 48 in total.
April 18 – Napa County announces three more cases, bringing the total to 47.
April 17 – Napa County announced five more cases, bringing its total to 44.
April 16 – Napa County announced one additional case, raising its total to 39.
April 14 – Napa County announced four additional cases, bringing its total to 38.
April 11 – Napa County has reported two new cases for a total of 34.
April 10 – Napa County added four cases, bringing the county’s total to 32.
April 9 – Napa County reported three new cases, bringing the county total to 28.
April 8 – Napa County announced two more cases, bringing its total to 25.
April 7 – Napa County adds one additional case for a total of 23.
April 6 – Napa County reported two more cases for 22 in total.
April 3 – Napa County Public Health announced the second confirmed death of a county resident due to COVID-19. Officials say the adult patient was being treated at a hospital in another county. The county also reported two more cases for a total of 20.
April 1 – Napa County announced three new cases, bringing the county total to 18.
March 31 – Napa County reported its first coronavirus-related death and an additional case, bringing the county case count to 15.
March 29 – Napa County reported two new coronavirus cases for a total of 14.
Napa County has two new confirmed coronavirus cases, bringing the total to 12, according to county officials.
March 28 – Napa county has announced its 10th coronavirus case.
Napa County’s number of confirmed coronavirus cases rose to nine.
March 27 – Napa County reported two new coronavirus cases, bringing the total to nine.
March 26 – Napa County Public Health announced one additional case, bringing the county total to seven.
March 25 – Officials in Napa County have announced the sixth confirmed COVID-19 case there. The patient is a resident of American Canyon and is currently in a hospital in another county.
Napa County Public Health announced two new cases, bringing the county total to five.
March 24 – Napa County Public Health confirms a third coronavirus case in the county.
March 22 – Health officials in Napa County have announced another new case, bringing the county total to two. The second patient is isolated in St. Helena, and officials said there is no known connection to the first case.
Napa County announced its first confirmed case of coronavirus.
Marin County
There are at least 199 cases reported in the county.
April 20 – Marin County has announced four new cases for a total of 199.
April 19 – Marin County has announced eight new cases for a total of 195.
April 16 – Marin County has announced three new cases for a total of 187 cases countywide.
April 15 – Marin County has reported 13 new cases for a total of 184.
April 14 – Marin County has reported one new case for a total of 171.
April 13 – Marin County has reported six new cases for a total of 170.
April 11 – Marin County has reported 10 new cases for a total of 164.
April 9 – Marin County reported five new cases for a total of 154.
April 8 – Marin County reported one new coronavirus case bringing the county total to 149.
April 7 – Marin County reported its 10th coronavirus-related death as well as five new cases, bringing the county total to 148.
April 6 – Marin County reported two new cases, bringing the total to 143, and two additional deaths for a total of nine.
April 5 – Marin County reported four new cases, bringing the total to 141, and an additional death for a total of seven.
April 4 – Marin County announced six new cases, for a total of 137 cases countywide.
April 3 – Marin County reported 13 new cases for a county total of 131.
April 2 – Marin County reported 10 new cases for a total of 118.
April 1 – Marin County has announced one new case of coronavirus, and one new death related to the disease. That brings the county to 108 cases and six deaths.
March 31 – Marin County officials have confirmed nine new COVID-19 cases, bringing the total to 107 cases countywide. They also announced one new death, bringing the total to five.
March 30 – Marin County officials have confirmed five new COVID-19 cases, bringing the total to 98 cases countywide. They also announced three new deaths, bringing the total to 4.
March 29 – Marin County officials have confirmed 19 new cases, bringing the total to 93 cases countywide.
Marin County officials have announced five new cases for a countywide total of 74.
March 28 – Marin County has announced one more case of coronavirus, bringing the total to 69.
March 27 – Marin County has announced three new cases, bringing the total to 68.
Marin County reported its first coronavirus-related death. The person who died was a man in his 70s who had been hospitalized for nearly three weeks, according to the county. He was exposed to the virus while on the Grand Princess cruise ship.
March 26 – Marin County has reported a total of 65 confirmed cases.
March 25 – Marin County reports seven new cases, bringing the county total to 60 confirmed cases.
March 24 – Marin County reports six new confirmed coronavirus cases, bringing the county total to 53.
March 23 – Marin County reports nine new confirmed coronavirus cases, bringing the county total to 47.
Marin County Public Health Officer Dr. Matt Willis announced he’s been diagnosed with the novel coronavirus. Here’s his video message to the public.
March 20 – Marin County reported 13 new coronavirus cases, making this the biggest jump in cases since the county reported its first case on March 4. This brings the county’s current cases total to 38.
March 19 – Marin County reported 10 new coronavirus cases. This brings the county’s total to 25.
March 17 – Marin County officials announced four new confirmed cases of coronavirus, bringing the county total to 15.
March 16 – Marin County officials announced two new confirmed cases of coronavirus, bringing the county total to 11.
March 15 – Marin County officials announced four new confirmed cases of coronavirus, bringing the county total to nine.
March 14 – Marin County health officials have announced two new cases of coronavirus, bringing the county’s total to five. According to the county public health officer, the two new cases have not been connected to other known cases and appear to have been infected through community exposure.
March 11 – Officials announced two new cases, bringing the total cases to three in the county. Both people were living with the person who was the county’s first confirmed case.
March 9 – Marin County officials report the first case of coronavirus affecting a Marin County resident. The individual was a passenger on the Grand Princess Cruise Ship that returned to San Francisco from Mexico on Feb. 21.
Officials have previously reported at least one case in the county, which is an evacuee from Travis Air Force Base being treated at a local hospital.
Santa Cruz County
There are at least 108 cases in the county.
April 21 – Santa Cruz County announced two new cases for a total of 108.
April 20 – Santa Cruz County’s case count rose to 106 with two more confirmed cases.
April 19 – Santa Cruz County reports three more cases of coronavirus, raising the total number of cases to 104
April 18 – Santa Cruz County officials report three new cases of coronavirus, raising the total to 101.
April 17 – Santa Cruz County reported two more cases, raising its total to 98.
April 15 – Santa Cruz County reported five additional cases for a total of 96.
April 14 – Santa Cruz County reported its second COVID-19 death. The person who died was a man in his late 60s who had an underlying health condition, according to county health officials.
April 13 – Santa Cruz County’s confirmed case count has increased to 91.
April 11 – Santa Cruz County now has a total of 82 confirmed cases of coronavirus.
April 9 – Santa Cruz County added four new cases for a total of 80.
April 7 – Santa Cruz County is up to 76 total cases after reporting five new ones.
April 6 – Santa Cruz County is up to 71 total cases after announcing two more.
April 5 – Santa Cruz County reports a total of 69 cases of coronavirus.
April 3 – Santa Cruz County announced two new cases, bringing the county total to 59.
April 2 – Santa Cruz County reported three new cases, bringing its total to 57.
April 1 – Santa Cruz County reported five new cases for a total of 54.
March 31 – Santa Cruz County is up to 49 total cases after announcing four new ones.
March 30 – Santa Cruz County reports an additional case. This brings the county to 45 total cases.
March 29 – Authorities report the first coronavirus death in Santa Cruz County. The individual was a man in his 70s with underlying health conditions.
In addition, Santa Cruz County reported 10 new cases of coronavirus raising the total to 44.
March 27 – Santa Cruz County reports two new cases, bringing the county to a total of 34.
March 26 – Santa Cruz County is up to 32 total cases after reporting seven additional cases.
March 25 – Santa Cruz County is up to 25 total cases after announcing one new case.
March 24 – Santa Cruz County announces two new cases. This brings the county’s total to 24.
March 23 – Santa Cruz County announces 22 total cases in the county.
March 20 – Santa Cruz County adds another case, marking the 15th in the county.
March 19 – Santa Cruz County reports another case, marking the 14th in the county.
March 17 – The number of confirmed cases in Santa Cruz County is at 13, officials announced.
March 9 – Health officials announced the second case of coronavirus in the county. The patient previously traveled to Seattle.
Authorities from Santa Cruz County said a resident who recently traveled on the Grand Princess cruise ship is the county’s first confirmed case of COVID-19 as of March 7.
Mendocino County
There are at least five cases reported in the county.
April 17 – Health officials in Mendocino County have announced a fifth case of coronavirus.
March 29 – Mendocino County has reported one new case, bringing the total to four.
March 28 – Mendocino County has reported its third confirmed coronavirus case.
March 24 – Mendocino County reported two confirmed cases in the county.
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