Ranking of Colorado 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 Colorado (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 20.60%. Among all Colorado counties, Crowley County had the highest percentage of its population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (51.45%), followed by Lincoln County (49.51%), and Bent County (48.56%).
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 High School Graduate or Equivalent in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Crowley County | 51.45 |
| 2 | Lincoln County | 49.51 |
| 3 | Bent County | 48.56 |
| 4 | Dolores County | 42.38 |
| 5 | Moffat County | 41.92 |
| 6 | Fremont County | 40.48 |
| 7 | Logan County | 38.53 |
| 8 | Delta County | 36.48 |
| 9 | Rio Blanco County | 32.92 |
| 10 | Conejos County | 32.78 |
| 11 | Otero County | 31.92 |
| 12 | Montrose County | 31.70 |
| 13 | Morgan County | 31.21 |
| 14 | Washington County | 31.13 |
| 15 | Saguache County | 30.67 |
| 16 | Grand County | 30.26 |
| 17 | Cheyenne County | 29.97 |
| 18 | Montezuma County | 29.93 |
| 19 | San Juan County | 29.91 |
| 20 | Pueblo County | 29.41 |
| 21 | Costilla County | 29.27 |
| 22 | Prowers County | 29.26 |
| 23 | Rio Grande County | 29.21 |
| 24 | Kit Carson County | 29.08 |
| 25 | Baca County | 28.88 |
| 26 | Alamosa County | 28.43 |
| 27 | Yuma County | 28.41 |
| 28 | Adams County | 28.30 |
| 29 | Phillips County | 28.07 |
| 30 | Mesa County | 27.33 |
| 31 | Kiowa County | 27.07 |
| 32 | Las Animas County | 26.56 |
| 33 | Sedgwick County | 26.30 |
| 34 | Huerfano County | 26.11 |
| 35 | Chaffee County | 25.76 |
| 36 | Garfield County | 25.74 |
| 37 | Weld County | 25.39 |
| 38 | Park County | 25.21 |
| 39 | Teller County | 24.94 |
| 40 | Lake County | 24.00 |
| 41 | Jackson County | 23.45 |
| 42 | Elbert County | 23.41 |
| 43 | Archuleta County | 21.85 |
| 44 | La Plata County | 20.42 |
| 45 | Clear Creek County | 20.02 |
| 46 | Arapahoe County | 19.67 |
| 47 | El Paso County | 19.60 |
| 47 | Jefferson County | 19.60 |
| 48 | Custer County | 17.97 |
| 49 | Larimer County | 17.43 |
| 50 | Summit County | 17.39 |
| 51 | San Miguel County | 17.27 |
| 52 | Gunnison County | 16.72 |
| 53 | Routt County | 16.23 |
| 54 | Hinsdale County | 16.13 |
| 55 | Denver County | 15.98 |
| 56 | Eagle County | 15.61 |
| 57 | Gilpin County | 14.20 |
| 58 | Pitkin County | 13.62 |
| 59 | Ouray County | 13.60 |
| 60 | Mineral County | 13.28 |
| 61 | Broomfield County | 12.98 |
| 62 | Douglas County | 12.15 |
| 63 | Boulder County | 11.10 |