Ranking of California Counties By Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the population of California (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 5,477,154. Among all California counties, Los Angeles County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (1,411,475), followed by Riverside County (423,504), and San Diego County (409,660).
The chart below shows the top 10 California counties, and the table below shows the ranking of all California counties.
You can see similar information for other educational attainments.
You can also see similar information for other states and for the United States.
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Related Topics: California ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of California Counties By Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Los Angeles County | 1411475 |
| 2 | Riverside County | 423504 |
| 3 | San Diego County | 409660 |
| 4 | Orange County | 378888 |
| 5 | San Bernardino County | 370115 |
| 6 | Sacramento County | 235075 |
| 7 | Alameda County | 198825 |
| 8 | Santa Clara County | 184860 |
| 9 | Kern County | 152266 |
| 10 | Contra Costa County | 140633 |
| 11 | Fresno County | 140532 |
| 12 | San Joaquin County | 140468 |
| 13 | Ventura County | 113615 |
| 14 | Stanislaus County | 104577 |
| 15 | San Mateo County | 82159 |
| 16 | San Francisco County | 78359 |
| 17 | Solano County | 74274 |
| 18 | Tulare County | 73748 |
| 19 | Sonoma County | 65278 |
| 20 | Monterey County | 56912 |
| 21 | Placer County | 49539 |
| 22 | Santa Barbara County | 47957 |
| 23 | Merced County | 43880 |
| 24 | San Luis Obispo County | 37215 |
| 25 | Shasta County | 33218 |
| 26 | Butte County | 31704 |
| 27 | El Dorado County | 28993 |
| 28 | Santa Cruz County | 28627 |
| 29 | Imperial County | 28187 |
| 30 | Kings County | 24622 |
| 31 | Madera County | 22929 |
| 32 | Yolo County | 22654 |
| 33 | Humboldt County | 21654 |
| 34 | Marin County | 19589 |
| 35 | Napa County | 17698 |
| 36 | Mendocino County | 17147 |
| 37 | Sutter County | 15907 |
| 38 | Nevada County | 14963 |
| 39 | Lake County | 14601 |
| 40 | Tehama County | 13014 |
| 41 | Yuba County | 11785 |
| 42 | San Benito County | 11037 |
| 43 | Calaveras County | 10815 |
| 44 | Tuolumne County | 10658 |
| 45 | Amador County | 9724 |
| 46 | Siskiyou County | 8724 |
| 47 | Lassen County | 7891 |
| 48 | Del Norte County | 6101 |
| 49 | Glenn County | 5538 |
| 50 | Trinity County | 4800 |
| 51 | Colusa County | 4246 |
| 52 | Inyo County | 4188 |
| 53 | Plumas County | 4108 |
| 54 | Mariposa County | 3028 |
| 55 | Modoc County | 2136 |
| 56 | Mono County | 2124 |
| 57 | Sierra County | 681 |
| 58 | Alpine County | 249 |