Ranking of California Counties By Percentage of Black or African American Alone Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)

Updated on September 5, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the California Black or African American Alone population (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 9.60%. Among all California counties, Sierra County had the highest percentage of its Black or African American Alone population (aged 25 years and above) with an educational attainment of Less than High School Diploma (100.00%), followed by Del Norte County (41.81%), and Lassen County (41.80%).

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, and for other races and ethnicities.

You can also see similar information for other states and for the United States.

Ranking of California Counties By Percentage of Black or African American Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Sierra County
Del Norte County
Lassen County
Amador County
Calaveras County
Humboldt County
Tuolumne County
Glenn County
Imperial County
Colusa County
Ranking of California Counties By Percentage of Black or African American Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Items per page:
0 of 0
Rank County Percentage of Population (Aged 25yrs+) (%)
1 Sierra County 100.00
2 Del Norte County 41.81
3 Lassen County 41.80
4 Amador County 33.02
5 Calaveras County 31.99
6 Humboldt County 29.51
7 Tuolumne County 25.84
8 Glenn County 25.77
9 Imperial County 25.52
10 Colusa County 24.78
11 Tehama County 22.58
12 Kings County 19.92
13 Shasta County 18.86
14 Trinity County 18.75
15 San Luis Obispo County 17.81
16 Madera County 17.61
17 Mariposa County 17.39
18 Siskiyou County 17.20
19 Kern County 15.85
20 Butte County 15.66
21 Marin County 15.21
22 Lake County 14.39
23 Sonoma County 12.82
24 Merced County 12.68
25 San Francisco County 12.67
26 El Dorado County 12.42
27 Monterey County 12.02
28 San Bernardino County 11.66
29 Santa Cruz County 11.18
30 Tulare County 11.15
31 Fresno County 11.06
31 Yuba County 11.06
32 Sutter County 10.78
33 San Joaquin County 10.62
34 Nevada County 10.42
35 Stanislaus County 10.35
36 Yolo County 10.16
37 Los Angeles County 9.59
38 Sacramento County 8.99
39 Alameda County 8.39
39 Napa County 8.39
40 San Diego County 8.38
40 Solano County 8.38
41 Inyo County 7.79
42 Orange County 7.73
43 Modoc County 7.63
44 Santa Clara County 7.61
45 Mendocino County 7.33
46 Contra Costa County 7.16
46 Riverside County 7.16
47 San Mateo County 6.86
48 Santa Barbara County 6.80
49 Plumas County 5.96
50 San Benito County 5.93
51 Ventura County 5.51
52 Placer County 3.66
53 Alpine County 0.00
53 Mono County 0.00