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Major California Counties
Given below is a list of major California Counties with their areas and population:
California County Maps
| Counties | County Seat | Area | Population |
| Alameda County | Oakland | 738 sq mi | 1,510,271 |
| Alpine County | Markleeville | 739 sq mi | 1,175 |
| Amador County | Jackson | 593 sq mi | 38,091 |
| Butte County | Oroville | 1,640 sq mi | 220,000 |
| Calaveras County | San Andreas | 1,020 sq mi | 45,578 |
| Colusa County | Colusa | 1,151 sq mi | 21,419 |
| Contra Costa County | Martinez | 720 sq mi | 1,049,025 |
| Del Norte County | Crescent City | 1,008 sq mi | 28,610 |
| El Dorado County | Placerville | 1,712 sq mi | 181,058 |
| Fresno County | Fresno | 5,963 sq mi | 930,450 |
| Glenn County | Willows | 1,315 sq mi | 28,122 |
| Humboldt County | Eureka | 3,573 sq mi | 134,623 |
| Imperial County | El Centro | 4,175 sq mi | 174,528 |
| Inyo County | Independence | 10,192 sq mi | 18,546 |
| Kern County | Bakersfield | 8,142 sq mi | 839,631 |
| Kings County | Hanford | 1,390 sq mi | 152,982 |
| Lake County | Lakeport | 1,258 sq mi | 64,665 |
| Lassen County | Susanville | 4,558 sq mi | 34,895 |
| Los Angeles County | Los Angeles | 4,060 sq mi | 9,818,605 |
| Madera County | Madera | 2,138 sq mi | 150,865 |
| Marin County | San Rafael | 520 sq mi | 252,409 |
| Mariposa County | Mariposa | 1,451 sq mi | 18,251 |
| Mendocino County | Ukiah | 3,509 sq mi | 87,841 |
| Merced County | Merced | 1,929 sq mi | 255,793 |
| Modoc County | Alturas | 3,944 sq mi | 9,686 |
| Mono County | Bridgeport | 3,044 sq mi | 14,202 |
| Monterey County | Salinas | 3,322 sq mi | 415,057 |
| Napa County | Napa | 754 sq mi | 136,484 |
| Nevada County | Nevada City | 958 sq mi | 98,764 |
| Orange County | Santa Ana | 790 sq mi | 3,010,232 |
| Placer County | Auburn | 1,503 sq mi | 348,432 |
| Plumas County | Quincy | 2,554 sq mi | 20,007 |
| Riverside County | Riverside | 7,208 sq mi | 2,189,641 |
| Sacramento County | Sacramento | 966 sq mi | 1,418,788 |
| San Benito County | Hollister | 1,389 sq mi | 55,269 |
| San Bernardino County | San Bernardino | 20,062 sq mi | 2,035,210 |
| San Diego County | San Diego | 4,204 sq mi | 3,095,313 |
| San Francisco County | San Francisco | 47 sq mi | 805,235 |
| San Joaquin County | Stockton | 1,399 sq mi | 685,306 |
| San Luis Obispo County | San Luis Obispo | 3,304 sq mi | 269,637 |
| San Mateo County | Redwood City | 449 sq mi | 718,451 |
| Santa Barbara County | Santa Barbara | 2,738 sq mi | 423,895 |
| Santa Clara County | San Jose | 1,291 sq mi | 1,781,642 |
| Santa Cruz County | Santa Cruz | 446 sq mi | 262,382 |
| Shasta County | Redding | 3,786 sq mi | 177,223 |
| Sierra County | Downieville | 953 sq mi | 3,240 |
| Siskiyou County | Yreka | 6,287 sq mi | 44,900 |
| Solano County | Fairfield | 828 sq mi | 413,344 |
| Sonoma County | Santa Rosa | 1,576 sq mi | 483,878 |
| Stanislaus County | Modesto | 1,495 sq mi | 514,453 |
| Sutter County | Yuba City | 603 sq mi | 94,737 |
| Tehama County | Red Bluff | 2,951 sq mi | 63,463 |
| Trinity County | Weaverville | 3,179 sq mi | 13,786 |
| Tulare County | Visalia | 4,824 sq mi | 442,179 |
| Tuolumne County | Sonora | 2,236 sq mi | 55,365 |
| Ventura County | Ventura | 1,846 sq mi | 823,318 |
| Yolo County | Woodland | 1,012 sq mi | 200,849 |
| Yuba County | Marysville | 630 sq mi | 72,155 |
