Counties in California
Each county page says how cases move there under California's rules, and lists the police agencies that serve it.
58 counties, largest first
- Los Angeles County9,694,934 people · 122 agencies
- San Diego County3,282,248 people · 37 agencies
- Orange County3,149,507 people · 45 agencies
- Riverside County2,544,916 people · 43 agencies
- San Bernardino County2,224,091 people · 44 agencies
- Santa Clara County1,914,391 people · 27 agencies
- Alameda County1,636,630 people · 31 agencies
- Sacramento County1,618,460 people · 29 agencies
- Contra Costa County1,170,070 people · 26 agencies
- Fresno County1,035,456 people · 29 agencies
- Kern County927,068 people · 24 agencies
- Ventura County830,851 people · 21 agencies
- San Francisco County826,079 people · 10 agencies
- San Joaquin County823,815 people · 15 agencies
- San Mateo County743,568 people · 27 agencies
- Stanislaus County557,719 people · 15 agencies
- Sonoma County486,444 people · 17 agencies
- Tulare County485,146 people · 15 agencies
- Solano County455,376 people · 14 agencies
- Placer County442,081 people · 11 agencies
- Santa Barbara County442,065 people · 15 agencies
- Monterey County433,729 people · 18 agencies
- Merced County297,260 people · 13 agencies
- San Luis Obispo County282,367 people · 18 agencies
- Santa Cruz County258,852 people · 12 agencies
- Marin County253,694 people · 16 agencies
- Yolo County224,410 people · 8 agencies
- Butte County209,211 people · 10 agencies
- El Dorado County192,323 people · 7 agencies
- Shasta County181,648 people · 9 agencies
- Imperial County181,411 people · 12 agencies
- Madera County167,927 people · 6 agencies
- Kings County154,327 people · 7 agencies
- Napa County132,949 people · 10 agencies
- Humboldt County131,647 people · 14 agencies
- Nevada County101,911 people · 8 agencies
- Sutter County98,787 people · 5 agencies
- Yuba County88,691 people · 4 agencies
- Mendocino County88,122 people · 8 agencies
- San Benito County70,082 people · 4 agencies
- Lake County67,772 people · 4 agencies
- Tehama County64,665 people · 8 agencies
- Tuolumne County53,160 people · 3 agencies
- Calaveras County46,605 people · 6 agencies
- Siskiyou County42,013 people · 16 agencies
- Amador County41,876 people · 10 agencies
- Glenn County28,141 people · 5 agencies
- Lassen County28,117 people · 5 agencies
- Del Norte County26,410 people · 3 agencies
- Colusa County21,836 people · 5 agencies
- Plumas County18,583 people · 4 agencies
- Inyo County18,158 people · 4 agencies
- Mariposa County16,918 people · 3 agencies
- Trinity County15,720 people · 3 agencies
- Mono County12,505 people · 5 agencies
- Modoc County8,426 people · 4 agencies
- Sierra County3,098 people · 3 agencies
- Alpine County1,043 people · 1 agencies
Population: Census Bureau county population estimates, Vintage 2025 (cc-est2025-alldata), July 1, 2025.