Ranking of Colorado Counties By Percentage of Population Aged 25 years and above with an Educational attainment of Less than High School Diploma 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 Colorado (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 7.64%. Among all Colorado counties, Morgan County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (19.28%), followed by Prowers County (17.83%), and Adams County (15.14%).
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.
You can also see similar information for other states and for the United States.
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Related Topics: Colorado ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Colorado Counties By Percentage of 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 | Morgan County | 19.28 |
| 2 | Prowers County | 17.83 |
| 3 | Adams County | 15.14 |
| 4 | Baca County | 14.46 |
| 5 | Jackson County | 13.90 |
| 6 | Saguache County | 13.34 |
| 7 | Phillips County | 13.23 |
| 8 | Costilla County | 13.14 |
| 9 | Alamosa County | 13.05 |
| 10 | Bent County | 12.92 |
| 11 | Yuma County | 12.52 |
| 12 | Otero County | 12.16 |
| 13 | Weld County | 11.91 |
| 14 | Las Animas County | 11.82 |
| 15 | Lake County | 11.72 |
| 16 | Lincoln County | 11.27 |
| 17 | Sedgwick County | 11.26 |
| 18 | Montrose County | 11.22 |
| 19 | Crowley County | 10.97 |
| 20 | Rio Grande County | 10.92 |
| 21 | Kit Carson County | 10.80 |
| 22 | Conejos County | 10.54 |
| 23 | Garfield County | 10.40 |
| 24 | Delta County | 10.36 |
| 25 | Fremont County | 10.32 |
| 26 | Denver County | 9.97 |
| 27 | Pueblo County | 9.47 |
| 28 | Montezuma County | 9.12 |
| 29 | Washington County | 8.58 |
| 30 | Logan County | 8.57 |
| 31 | Rio Blanco County | 8.53 |
| 32 | Mesa County | 8.45 |
| 33 | Eagle County | 8.30 |
| 34 | Moffat County | 8.02 |
| 35 | Arapahoe County | 7.93 |
| 36 | Huerfano County | 7.90 |
| 37 | Cheyenne County | 6.97 |
| 38 | Gilpin County | 6.27 |
| 39 | Archuleta County | 5.96 |
| 40 | Chaffee County | 5.59 |
| 41 | El Paso County | 5.55 |
| 41 | Grand County | 5.55 |
| 42 | Summit County | 5.46 |
| 43 | Jefferson County | 4.86 |
| 44 | Boulder County | 4.51 |
| 45 | Larimer County | 3.68 |
| 46 | Elbert County | 3.65 |
| 47 | Hinsdale County | 3.63 |
| 48 | Dolores County | 3.57 |
| 49 | Broomfield County | 3.42 |
| 49 | San Juan County | 3.42 |
| 50 | La Plata County | 3.41 |
| 51 | Routt County | 3.33 |
| 52 | Kiowa County | 2.90 |
| 53 | Clear Creek County | 2.65 |
| 54 | Park County | 2.54 |
| 55 | Pitkin County | 2.49 |
| 56 | Teller County | 2.16 |
| 57 | Douglas County | 2.12 |
| 58 | Mineral County | 2.09 |
| 59 | Gunnison County | 2.04 |
| 60 | Custer County | 1.71 |
| 60 | San Miguel County | 1.71 |
| 61 | Ouray County | 1.38 |
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