County Level Postal Hub • 58 Counties
All 58 Counties in California (CA)
California has 58 counties. Explore county seats, FIPS identifiers, Census demographics, and associated municipalities and ZIP codes.
Total Counties 58
Most Populous Los Angeles County (10,014,009)
Municipalities 997 Major Cities
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Showing 58 counties
| County Name | FIPS | County Seat | Largest City | Population | Area (sq mi) | Action |
|---|---|---|---|---|---|---|
| Alameda County | 06001 | Oakland | Oakland | 1,682,353 | 739 | View County → |
| Alpine County | 06003 | Markleeville | Markleeville | 1,204 | 738 | View County → |
| Amador County | 06005 | Jackson | Ione | 40,474 | 595 | View County → |
| Butte County | 06007 | Oroville | Chico | 211,632 | 1,636 | View County → |
| Calaveras County | 06009 | San Andreas | Angels Camp | 45,292 | 1,020 | View County → |
| Colusa County | 06011 | Colusa | Colusa | 21,839 | 1,151 | View County → |
| Contra Costa County | 06013 | Martinez | Concord | 1,165,927 | 716 | View County → |
| Del Norte County | 06015 | Crescent City | Crescent City | 27,743 | 1,006 | View County → |
| El Dorado County | 06017 | Placerville | South Lake Tahoe | 191,059 | 1,708 | View County → |
| Fresno County | 06019 | Fresno | Fresno | 1,008,654 | 5,958 | View County → |
| Glenn County | 06021 | Willows | Orland | 28,917 | 1,314 | View County → |
| Humboldt County | 06023 | Eureka | Eureka | 136,463 | 3,568 | View County → |
| Imperial County | 06025 | El Centro | El Centro | 179,702 | 4,177 | View County → |
| Inyo County | 06027 | Independence | Bishop | 19,016 | 10,181 | View County → |
| Kern County | 06029 | Bakersfield | Bakersfield | 909,235 | 8,132 | View County → |
| Kings County | 06031 | Hanford | Hanford | 152,481 | 1,389 | View County → |
| Lake County | 06033 | Lakeport | Clearlake | 68,163 | 1,256 | View County → |
| Lassen County | 06035 | Susanville | Susanville | 32,730 | 4,541 | View County → |
| Los Angeles County | 06037 | Los Angeles | Los Angeles | 10,014,009 | 4,058 | View County → |
| Madera County | 06039 | Madera | Madera | 156,255 | 2,137 | View County → |
| Marin County | 06041 | San Rafael | San Rafael | 262,321 | 520 | View County → |
| Mariposa County | 06043 | Mariposa | Mariposa | 17,131 | 1,449 | View County → |
| Mendocino County | 06045 | Ukiah | Ukiah | 91,601 | 3,506 | View County → |
| Merced County | 06047 | Merced | Merced | 281,202 | 1,935 | View County → |
| Modoc County | 06049 | Alturas | Alturas | 8,700 | 3,918 | View County → |
| Mono County | 06051 | Bridgeport | Mammoth Lakes | 13,195 | 3,049 | View County → |
| Monterey County | 06053 | Salinas | Salinas | 439,035 | 3,281 | View County → |
| Napa County | 06055 | Napa | Napa | 138,019 | 748 | View County → |
| Nevada County | 06057 | Nevada City | Truckee | 102,241 | 958 | View County → |
| Orange County | 06059 | Santa Ana | Anaheim | 3,186,989 | 791 | View County → |
| Placer County | 06061 | Auburn | Roseville | 404,739 | 1,407 | View County → |
| Plumas County | 06063 | Quincy | Portola | 19,790 | 2,553 | View County → |
| Riverside County | 06065 | Riverside | Riverside | 2,418,185 | 7,206 | View County → |
| Sacramento County | 06067 | Sacramento | Sacramento | 1,585,055 | 965 | View County → |
| San Benito County | 06069 | Hollister | Hollister | 64,209 | 1,389 | View County → |
| San Bernardino County | 06071 | San Bernardino | San Bernardino | 2,181,654 | 20,056 | View County → |
| San Diego County | 06073 | San Diego | San Diego | 3,298,634 | 4,207 | View County → |
| San Francisco County | 06075 | San Francisco | San Francisco | 873,965 | 47 | View County → |
| San Joaquin County | 06077 | Stockton | Stockton | 779,209 | 1,391 | View County → |
| San Luis Obispo County | 06079 | San Luis Obispo | San Luis Obispo | 282,424 | 3,299 | View County → |
| San Mateo County | 06081 | Redwood City | Daly City | 764,442 | 448 | View County → |
| Santa Barbara County | 06083 | Santa Barbara | Santa Maria | 448,229 | 2,735 | View County → |
| Santa Clara County | 06085 | San Jose | San Jose | 1,936,259 | 1,290 | View County → |
| Santa Cruz County | 06087 | Santa Cruz | Santa Cruz | 270,861 | 445 | View County → |
| Shasta County | 06089 | Redding | Redding | 182,155 | 3,775 | View County → |
| Sierra County | 06091 | Downieville | Loyalton | 3,236 | 953 | View County → |
| Siskiyou County | 06093 | Yreka | Yreka | 44,076 | 6,278 | View County → |
| Solano County | 06095 | Fairfield | Vallejo | 453,495 | 822 | View County → |
| Sonoma County | 06097 | Santa Rosa | Santa Rosa | 488,863 | 1,575 | View County → |
| Stanislaus County | 06099 | Modesto | Modesto | 552,878 | 1,494 | View County → |
| Sutter County | 06101 | Yuba City | Yuba City | 99,633 | 602 | View County → |
| Tehama County | 06103 | Red Bluff | Red Bluff | 65,829 | 2,950 | View County → |
| Trinity County | 06105 | Weaverville | Weaverville | 16,112 | 3,179 | View County → |
| Tulare County | 06107 | Visalia | Visalia | 473,117 | 4,824 | View County → |
| Tuolumne County | 06109 | Sonora | Sonora | 55,620 | 2,221 | View County → |
| Ventura County | 06111 | Ventura | Oxnard | 843,843 | 1,843 | View County → |
| Yolo County | 06113 | Woodland | Davis | 216,403 | 1,015 | View County → |
| Yuba County | 06115 | Marysville | Marysville | 81,575 | 632 | View County → |