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State and county totals come from a ongoing Times survey of California’s 58 county health agencies as well as the three run by cities. Those figures are ahead of the totals periodically released by the state’s Department of Public Health. State officials acknowledge that their tallies lag behind the updates posted by local agencies throughout the day and do not dispute The Times’ method.
Data on hospitalizations, tests, demographics and reopening plans come from California’s Department of Public Health.
Nursing home totals include skilled-nursing facilities tracked by the state public health department, as well as assisted-living facilities monitored by the California Department of Social Services.
Data from other states, Washington, D.C. and Puerto Rico are collected by researchers at the Johns Hopkins University Center for Systems Science and Engineering.
The Times database is available to the public on Github, a popular website for hosting data and computer code. The files will be updated daily at github.com/datadesk/california-coronavirus-data.
Learn more about The Times count by reading this list of frequently asked questions or by reading this interview with members of our team.
If you see information here that you believe is incorrect or out of date, please contact Data and Graphics Editor Ben Welsh at [email protected]