Business planning by county

California county reference

58 counties and county equivalents in California. Search names or FIPS codes, compare Census geography and keep the original sources with your work.

• Alameda County

  California · FIPS 06001

  1,636,630 residents · 2025 estimate

• Alpine County

  California · FIPS 06003

  1,043 residents · 2025 estimate

• Amador County

  California · FIPS 06005

  41,876 residents · 2025 estimate

• Butte County

  California · FIPS 06007

  209,211 residents · 2025 estimate

• Calaveras County

  California · FIPS 06009

  46,605 residents · 2025 estimate

• Colusa County

  California · FIPS 06011

  21,836 residents · 2025 estimate

• Contra Costa County

  California · FIPS 06013

  1,170,070 residents · 2025 estimate

• Del Norte County

  California · FIPS 06015

  26,410 residents · 2025 estimate

• El Dorado County

  California · FIPS 06017

  192,323 residents · 2025 estimate

• Fresno County

  California · FIPS 06019

  1,035,456 residents · 2025 estimate

• Glenn County

  California · FIPS 06021

  28,141 residents · 2025 estimate

• Humboldt County

  California · FIPS 06023

  131,647 residents · 2025 estimate

• Imperial County

  California · FIPS 06025

  181,411 residents · 2025 estimate

• Inyo County

  California · FIPS 06027

  18,158 residents · 2025 estimate

• Kern County

  California · FIPS 06029

  927,068 residents · 2025 estimate

• Kings County

  California · FIPS 06031

  154,327 residents · 2025 estimate

• Lake County

  California · FIPS 06033

  67,772 residents · 2025 estimate

• Lassen County

  California · FIPS 06035

  28,117 residents · 2025 estimate

• Los Angeles County

  California · FIPS 06037

  9,694,934 residents · 2025 estimate

• Madera County

  California · FIPS 06039

  167,927 residents · 2025 estimate

• Marin County

  California · FIPS 06041

  253,694 residents · 2025 estimate

• Mariposa County

  California · FIPS 06043

  16,918 residents · 2025 estimate

• Mendocino County

  California · FIPS 06045

  88,122 residents · 2025 estimate

• Merced County

  California · FIPS 06047

  297,260 residents · 2025 estimate

• Modoc County

  California · FIPS 06049

  8,426 residents · 2025 estimate

• Mono County

  California · FIPS 06051

  12,505 residents · 2025 estimate

• Monterey County

  California · FIPS 06053

  433,729 residents · 2025 estimate

• Napa County

  California · FIPS 06055

  132,949 residents · 2025 estimate

• Nevada County

  California · FIPS 06057

  101,911 residents · 2025 estimate

• Orange County

  California · FIPS 06059

  3,149,507 residents · 2025 estimate

• Placer County

  California · FIPS 06061

  442,081 residents · 2025 estimate

• Plumas County

  California · FIPS 06063

  18,583 residents · 2025 estimate

• Riverside County

  California · FIPS 06065

  2,544,916 residents · 2025 estimate

• Sacramento County

  California · FIPS 06067

  1,618,460 residents · 2025 estimate

• San Benito County

  California · FIPS 06069

  70,082 residents · 2025 estimate

• San Bernardino County

  California · FIPS 06071

  2,224,091 residents · 2025 estimate

• San Diego County

  California · FIPS 06073

  3,282,248 residents · 2025 estimate

• San Francisco County

  California · FIPS 06075

  826,079 residents · 2025 estimate

• San Joaquin County

  California · FIPS 06077

  823,815 residents · 2025 estimate

• San Luis Obispo County

  California · FIPS 06079

  282,367 residents · 2025 estimate

• San Mateo County

  California · FIPS 06081

  743,568 residents · 2025 estimate

• Santa Barbara County

  California · FIPS 06083

  442,065 residents · 2025 estimate

• Santa Clara County

  California · FIPS 06085

  1,914,391 residents · 2025 estimate

• Santa Cruz County

  California · FIPS 06087

  258,852 residents · 2025 estimate

• Shasta County

  California · FIPS 06089

  181,648 residents · 2025 estimate

• Sierra County

  California · FIPS 06091

  3,098 residents · 2025 estimate

• Siskiyou County

  California · FIPS 06093

  42,013 residents · 2025 estimate

• Solano County

  California · FIPS 06095

  455,376 residents · 2025 estimate

• Sonoma County

  California · FIPS 06097

  486,444 residents · 2025 estimate

• Stanislaus County

  California · FIPS 06099

  557,719 residents · 2025 estimate

• Sutter County

  California · FIPS 06101

  98,787 residents · 2025 estimate

• Tehama County

  California · FIPS 06103

  64,665 residents · 2025 estimate

• Trinity County

  California · FIPS 06105

  15,720 residents · 2025 estimate

• Tulare County

  California · FIPS 06107

  485,146 residents · 2025 estimate

• Tuolumne County

  California · FIPS 06109

  53,160 residents · 2025 estimate

• Ventura County

  California · FIPS 06111

  830,851 residents · 2025 estimate

• Yolo County

  California · FIPS 06113

  224,410 residents · 2025 estimate

• Yuba County

  California · FIPS 06115

  88,691 residents · 2025 estimate

Use the county data

Use a county reference when organizing a market-research brief, outreach territory or business calculation. County population gives geographic context; it does not measure the number of qualified customers.

These are geographic reference records, not contact lists or verified sales leads.

Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.