Population of Counties in California (2018)

Name 2018 Population Growth Rate
Los Angeles County10,150,5583.32%
San Diego County3,317,2006.88%
Orange County3,177,7035.32%
Riverside County2,386,5228.38%
San Bernardino County2,137,1314.70%
Santa Clara County1,931,5758.12%
Alameda County1,653,2369.24%
Sacramento County1,513,2606.44%
Contra Costa County1,138,6458.15%
Fresno County979,5345.08%
Kern County885,0865.23%
San Francisco County876,1038.73%
Ventura County851,0963.13%
San Mateo County769,5616.90%
San Joaquin County734,2946.84%
Stanislaus County541,3535.07%
Sonoma County503,8333.92%
Tulare County460,8354.01%
Santa Barbara County446,2965.17%
Solano County440,3186.34%
Monterey County436,3634.78%
Placer County379,7428.49%
San Luis Obispo County282,2824.62%
Santa Cruz County275,1964.55%
Merced County268,8784.71%
Marin County261,5323.40%
Butte County226,5252.99%
Yolo County215,9597.39%
El Dorado County186,2722.83%
Imperial County180,9803.55%
Shasta County178,7740.84%
Madera County154,9662.60%
Kings County149,797-1.71%
Napa County141,6493.55%
Humboldt County136,4491.06%
Nevada County99,0530.27%
Sutter County96,0581.37%
Mendocino County87,609-0.22%
Yuba County75,1853.92%
Lake County63,950-1.22%
Tehama County63,444-0.19%
San Benito County59,3356.85%
Tuolumne County53,787-2.54%
Calaveras County45,315-0.34%
Siskiyou County43,511-3.18%
Amador County37,473-1.08%
Lassen County30,944-11.16%
Glenn County27,967-0.58%
Del Norte County27,450-3.91%
Colusa County21,6450.89%
Plumas County18,787-5.66%
Inyo County18,034-2.61%
Mariposa County17,524-4.14%
Mono County14,101-0.73%
Trinity County12,839-6.62%
Modoc County8,941-7.82%
Sierra County2,964-7.98%
Alpine County1,057-8.96%