Ranking of Colorado Counties By 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 population of Colorado (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 810,976. Among all Colorado counties, Adams County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (94,610), followed by El Paso County (92,459), and Arapahoe County (87,772).
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 Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Adams County | 94610 |
| 2 | El Paso County | 92459 |
| 3 | Arapahoe County | 87772 |
| 4 | Jefferson County | 82874 |
| 5 | Denver County | 82175 |
| 6 | Weld County | 53024 |
| 7 | Larimer County | 41169 |
| 8 | Pueblo County | 33834 |
| 9 | Mesa County | 29507 |
| 10 | Douglas County | 28669 |
| 11 | Boulder County | 24354 |
| 12 | Fremont County | 15356 |
| 13 | Garfield County | 10536 |
| 14 | Montrose County | 9615 |
| 15 | Delta County | 8368 |
| 16 | La Plata County | 8171 |
| 17 | Broomfield County | 6603 |
| 18 | Eagle County | 6210 |
| 19 | Logan County | 5851 |
| 20 | Morgan County | 5826 |
| 21 | Montezuma County | 5553 |
| 22 | Teller County | 4782 |
| 23 | Elbert County | 4341 |
| 24 | Summit County | 4207 |
| 25 | Otero County | 4040 |
| 26 | Chaffee County | 3939 |
| 27 | Moffat County | 3748 |
| 28 | Grand County | 3591 |
| 29 | Park County | 3502 |
| 30 | Routt County | 3035 |
| 31 | Las Animas County | 2830 |
| 32 | Alamosa County | 2790 |
| 33 | Rio Grande County | 2331 |
| 34 | Prowers County | 2255 |
| 35 | Archuleta County | 2228 |
| 36 | Bent County | 2203 |
| 37 | Crowley County | 2166 |
| 38 | Lincoln County | 2083 |
| 39 | Yuma County | 1858 |
| 40 | Pitkin County | 1831 |
| 41 | Gunnison County | 1826 |
| 42 | Conejos County | 1633 |
| 43 | Clear Creek County | 1517 |
| 44 | Saguache County | 1460 |
| 45 | Rio Blanco County | 1420 |
| 46 | Kit Carson County | 1392 |
| 47 | Huerfano County | 1335 |
| 48 | Lake County | 1288 |
| 49 | San Miguel County | 1078 |
| 50 | Washington County | 1052 |
| 51 | Dolores County | 831 |
| 52 | Phillips County | 800 |
| 53 | Costilla County | 762 |
| 54 | Baca County | 735 |
| 55 | Gilpin County | 664 |
| 56 | Custer County | 661 |
| 57 | Ouray County | 542 |
| 58 | Sedgwick County | 460 |
| 59 | Cheyenne County | 344 |
| 60 | Jackson County | 253 |
| 61 | Kiowa County | 252 |
| 62 | San Juan County | 166 |
| 63 | Hinsdale County | 120 |
| 64 | Mineral County | 89 |
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