Ranking of Colorado Counties By Percentage of American Indian and Alaska Native 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 Colorado American Indian and Alaska Native Alone population (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 15.72%. Among all Colorado counties, Mineral County had the highest percentage of its American Indian and Alaska Native Alone population (aged 25 years and above) with an educational attainment of Less than High School Diploma (100.00%), followed by Huerfano County (80.50%), and Chaffee County (69.01%).

The chart below shows the top 10 Colorado counties, and the table below shows the ranking of all Colorado 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 Colorado Counties By Percentage of American Indian and Alaska Native Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Mineral County
Huerfano County
Chaffee County
Morgan County
Alamosa County
Fremont County
Prowers County
Montrose County
Las Animas County
Delta County
Ranking of Colorado Counties By Percentage of American Indian and Alaska Native Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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Rank County Percentage of Population (Aged 25yrs+) (%)
1 Mineral County 100.00
2 Huerfano County 80.50
3 Chaffee County 69.01
4 Morgan County 60.85
5 Alamosa County 57.02
6 Fremont County 40.12
7 Prowers County 38.41
8 Montrose County 31.60
9 Las Animas County 31.55
10 Delta County 30.15
11 Saguache County 23.96
12 Pueblo County 22.90
13 Weld County 21.86
14 Conejos County 21.05
15 Gunnison County 20.83
16 Elbert County 19.60
17 Adams County 18.78
18 Rio Grande County 16.67
19 Jefferson County 16.41
20 Otero County 13.43
21 Arapahoe County 13.31
22 Denver County 13.21
23 El Paso County 11.51
24 Mesa County 11.43
25 Larimer County 10.35
26 Douglas County 10.22
27 Montezuma County 8.33
28 La Plata County 8.24
29 Costilla County 6.80
30 Boulder County 6.65
31 Garfield County 6.54
32 Crowley County 5.59
33 Baca County 5.26
34 Moffat County 5.11
35 Clear Creek County 3.57
36 Logan County 3.31
37 Teller County 0.69
38 Archuleta County 0.00
38 Bent County 0.00
38 Broomfield County 0.00
38 Custer County 0.00
38 Dolores County 0.00
38 Eagle County 0.00
38 Gilpin County 0.00
38 Grand County 0.00
38 Hinsdale County 0.00
38 Kiowa County 0.00
38 Kit Carson County 0.00
38 Lake County 0.00
38 Lincoln County 0.00
38 Ouray County 0.00
38 Park County 0.00
38 Phillips County 0.00
38 Pitkin County 0.00
38 Rio Blanco County 0.00
38 Routt County 0.00
38 San Miguel County 0.00
38 Sedgwick County 0.00
38 Summit County 0.00
38 Yuma County 0.00