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State and county totals come from a continual 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.
The tallies here are limited to residents of California, which is the standard method used to count patients by the state’s health authorities. Those totals do not include people from other states who are quarantined or hospitalized here, but do include inmates at state prisons.
Cases and deaths are recorded here based on the date they were reported by public health officials.
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.
Data on hospitalizations, tests, demographics and nursing homes come from California’s Department of Public Health.
Closures and restrictions are drawn from an ongoing Times survey of county governments.
In an effort to aid scientists and researchers in the fight against COVID-19, The Times has released its database of California coronavirus cases to the public.
The database is available on Github, a popular website for hosting data and computer code. The files will be updated daily at github.com/datadesk/california-coronavirus-data.
If you see information here that you believe is incorrect or out of date, please contact Data and Graphics Editor Ben Welsh at firstname.lastname@example.org.