Ranking of California Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, among all the counties in California, Los Angeles County had the highest voting-age population (18 years and over) (7.96M), followed by San Diego County (2.61M), and Orange County (2.52M).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all California counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: California Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of California Counties By Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | Los Angeles County | 7959791 |
| 2 | San Diego County | 2608768 |
| 3 | Orange County | 2519658 |
| 4 | Riverside County | 1823505 |
| 5 | San Bernardino County | 1629042 |
| 6 | Santa Clara County | 1529717 |
| 7 | Alameda County | 1338388 |
| 8 | Sacramento County | 1217309 |
| 9 | Contra Costa County | 902672 |
| 10 | San Francisco County | 760738 |
| 11 | Fresno County | 730245 |
| 12 | Ventura County | 656198 |
| 13 | Kern County | 651739 |
| 14 | San Mateo County | 610236 |
| 15 | San Joaquin County | 573400 |
| 16 | Stanislaus County | 407908 |
| 17 | Sonoma County | 393152 |
| 18 | Solano County | 354770 |
| 19 | Santa Barbara County | 350805 |
| 20 | Tulare County | 331093 |
| 21 | Monterey County | 327777 |
| 22 | Placer County | 313117 |
| 23 | San Luis Obispo County | 231744 |
| 24 | Santa Cruz County | 219764 |
| 25 | Marin County | 209451 |
| 26 | Merced County | 200223 |
| 27 | Yolo County | 171256 |
| 28 | Butte County | 168339 |
| 29 | El Dorado County | 152083 |
| 30 | Shasta County | 143512 |
| 31 | Imperial County | 132200 |
| 32 | Madera County | 113229 |
| 33 | Kings County | 111935 |
| 34 | Napa County | 110473 |
| 35 | Humboldt County | 109809 |
| 36 | Nevada County | 84331 |
| 37 | Sutter County | 74581 |
| 38 | Mendocino County | 72751 |
| 39 | Yuba County | 59545 |
| 40 | Lake County | 54080 |
| 41 | Tehama County | 49851 |
| 42 | San Benito County | 47915 |
| 43 | Tuolumne County | 46268 |
| 44 | Calaveras County | 37337 |
| 45 | Siskiyou County | 35590 |
| 46 | Amador County | 34042 |
| 47 | Lassen County | 27226 |
| 48 | Del Norte County | 22052 |
| 49 | Glenn County | 21464 |
| 50 | Plumas County | 16340 |
| 51 | Colusa County | 15733 |
| 52 | Inyo County | 15180 |
| 53 | Mariposa County | 14187 |
| 54 | Trinity County | 13419 |
| 55 | Mono County | 10555 |
| 56 | Modoc County | 6905 |
| 57 | Sierra County | 2698 |
| 58 | Alpine County | 1009 |