Ranking of California Counties By Percentage of 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 percentage of the population of California (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 20.44%. Among all California counties, Trinity County had the highest percentage of its population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (38.42%), followed by Modoc County (32.54%), and Lassen County (32.44%).
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 Percentage of Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Trinity County | 38.42 |
| 2 | Modoc County | 32.54 |
| 3 | Lassen County | 32.44 |
| 4 | Del Norte County | 30.97 |
| 5 | Calaveras County | 30.94 |
| 6 | Amador County | 30.65 |
| 7 | Inyo County | 30.47 |
| 8 | Colusa County | 30.46 |
| 9 | Glenn County | 30.27 |
| 10 | Stanislaus County | 29.97 |
| 11 | Lake County | 29.89 |
| 12 | Sierra County | 29.52 |
| 13 | Tehama County | 28.99 |
| 14 | San Joaquin County | 28.76 |
| 15 | Kern County | 27.57 |
| 16 | Plumas County | 27.30 |
| 17 | Siskiyou County | 27.07 |
| 18 | Riverside County | 26.93 |
| 19 | San Bernardino County | 26.87 |
| 20 | San Benito County | 26.79 |
| 21 | Merced County | 26.52 |
| 22 | Tulare County | 26.48 |
| 23 | Mendocino County | 26.32 |
| 24 | Kings County | 26.12 |
| 25 | Shasta County | 25.83 |
| 26 | Alpine County | 25.70 |
| 27 | Imperial County | 25.56 |
| 28 | Tuolumne County | 25.21 |
| 29 | Sutter County | 24.52 |
| 30 | Solano County | 23.77 |
| 31 | Madera County | 23.26 |
| 32 | Yuba County | 23.20 |
| 33 | Humboldt County | 23.08 |
| 34 | Fresno County | 22.69 |
| 35 | Mariposa County | 22.41 |
| 36 | Mono County | 22.37 |
| 37 | Butte County | 22.30 |
| 38 | Sacramento County | 22.01 |
| 39 | El Dorado County | 20.79 |
| 40 | Los Angeles County | 20.39 |
| 41 | Monterey County | 20.29 |
| 42 | Ventura County | 19.77 |
| 43 | San Luis Obispo County | 19.55 |
| 44 | Nevada County | 19.04 |
| 45 | Sonoma County | 18.31 |
| 46 | San Diego County | 18.20 |
| 47 | Napa County | 17.96 |
| 48 | Yolo County | 17.74 |
| 49 | Placer County | 17.58 |
| 50 | Contra Costa County | 17.47 |
| 51 | Santa Barbara County | 17.26 |
| 52 | Orange County | 17.24 |
| 53 | Alameda County | 16.65 |
| 54 | Santa Cruz County | 15.91 |
| 55 | San Mateo County | 14.89 |
| 56 | Santa Clara County | 13.70 |
| 57 | San Francisco County | 11.37 |
| 58 | Marin County | 10.17 |