List of Counties In California State

The state of California is divided into 58 counties. Butte County is the oldest (founded in 1850), whereas Imperial County is the youngest (established in 1907).

Los Angeles County is the most populous, with a population of 10,163,507 people. San Bernardino County has the most land area (1853 km2), whereas San Francisco County has the smallest (122 km2).

Please find a list of all California counties sorted alphabetically below.

• Alameda County, CA
• Alpine County, CA
• Amador County, CA
• Butte County, CA
• Calaveras County, CA
• Colusa County, CA
• Contra Costa County, CA
• Del Norte County, CA
• El Dorado County, CA
• Fresno County, CA
• Glenn County, CA
• Humboldt County, CA
• Imperial County, CA
• Inyo County, CA
• Kern County, CA
• Kings County, CA
• Lake County, CA
• Lassen County, CA
• Los Angeles County, CA
• Madera County, CA
• Marin County, CA
• Mariposa County, CA
• Mendocino County, CA
• Merced County, CA
• Modoc County, CA
• Mono County, CA
• Monterey County, CA
• Napa County, CA
• Nevada County, CA
• Orange County, CA
• Placer County, CA
• Plumas County, CA
• Riverside County, CA
• Sacramento County, CA
• San Benito County, CA
• San Bernardino County, CA
• San Diego County, CA
• San Francisco County, CA
• San Joaquin County, CA
• San Luis Opispo County, CA
• San Mateo County, CA
• Santa Barbara County, CA
• Santa Clara County, CA
• Santa Cruz County, CA
• Shasta County, CA
• Sierra County, CA
• Siskiyou County, CA
• Solano County, CA
• Sonoma County, CA
• Stanislaus County, CA
• Sutter County, CA
• Tehama County, CA
• Toulumne County, CA
• Trinity County, CA
• Tulare County, CA
• Ventura County, CA
• Yolo County, CA
• Yuba County, CA