Data / Rankings / High school graduate or higher, population 25 and over / Counties in Colorado

Counties in Colorado by high school graduate or higher, population 25 and over

Ouray County had the highest high school graduate or higher, population 25 and over of 64 counties in 2021, at 98.6%. Morgan County had the lowest, at 80.7%. The median was 91.6% and the figure for Colorado was 92.4%. Source: the U.S. Census Bureau.

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Highest98.6Ouray County
Lowest80.7Morgan County
Median91.664 counties
Colorado92.4History

Map of counties, 2021

Adams County: 84.9 %Alamosa County: 87 %Arapahoe County: 92.1 %Archuleta County: 94 %Baca County: 85.5 %Bent County: 87.1 %Boulder County: 95.5 %Broomfield County: 96.6 %Chaffee County: 94.4 %Cheyenne County: 93 %Clear Creek County: 97.4 %Conejos County: 89.5 %Costilla County: 86.9 %Crowley County: 89 %Custer County: 98.3 %Delta County: 89.6 %Denver County: 90 %Dolores County: 96.4 %Douglas County: 97.9 %Eagle County: 91.7 %Elbert County: 96.4 %El Paso County: 94.5 %Fremont County: 89.7 %Garfield County: 89.6 %Gilpin County: 93.7 %Grand County: 94.5 %Gunnison County: 98 %Hinsdale County: 96.4 %Huerfano County: 92.1 %Jackson County: 86.1 %Jefferson County: 95.1 %Kiowa County: 97.1 %Kit Carson County: 89.2 %Lake County: 88.3 %La Plata County: 96.6 %Larimer County: 96.3 %Las Animas County: 88.2 %Lincoln County: 88.7 %Logan County: 91.4 %Mesa County: 91.6 %Mineral County: 97.9 %Moffat County: 92 %Montezuma County: 90.9 %Montrose County: 88.8 %Morgan County: 80.7 %Otero County: 87.8 %Ouray County: 98.6 %Park County: 97.5 %Phillips County: 86.8 %Pitkin County: 97.5 %Prowers County: 82.2 %Pueblo County: 90.5 %Rio Blanco County: 91.5 %Rio Grande County: 89.1 %Routt County: 96.7 %Saguache County: 86.7 %San Juan County: 96.6 %San Miguel County: 98.3 %Sedgwick County: 88.7 %Summit County: 94.5 %Teller County: 97.8 %Washington County: 91.4 %Weld County: 88.1 %Yuma County: 87.5 %
  • Under 88
  • 88 to 89
  • 89 to 92
  • 92 to 95
  • 95 to 97
  • 97 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Ouray County: 98.6 %Ouray County98.6Custer County: 98.3 %Custer County98.3San Miguel County: 98.3 %San Miguel County98.3Gunnison County: 98 %Gunnison County98Mineral County: 97.9 %Mineral County97.9Douglas County: 97.9 %Douglas County97.9Teller County: 97.8 %Teller County97.8Pitkin County: 97.5 %Pitkin County97.5Park County: 97.5 %Park County97.5Clear Creek County: 97.4 %Clear Creek County97.4Kiowa County: 97.1 %Kiowa County97.1Routt County: 96.7 %Routt County96.7La Plata County: 96.6 %La Plata County96.6Broomfield County: 96.6 %Broomfield County96.6San Juan County: 96.6 %San Juan County96.6Dolores County: 96.4 %Dolores County96.4Hinsdale County: 96.4 %Hinsdale County96.4Elbert County: 96.4 %Elbert County96.4Larimer County: 96.3 %Larimer County96.3Boulder County: 95.5 %Boulder County95.5Jefferson County: 95.1 %Jefferson County95.1Summit County: 94.5 %Summit County94.5El Paso County: 94.5 %El Paso County94.5Grand County: 94.5 %Grand County94.5Chaffee County: 94.4 %Chaffee County94.4Archuleta County: 94 %Archuleta County94Gilpin County: 93.7 %Gilpin County93.7Cheyenne County: 93 %Cheyenne County93Huerfano County: 92.1 %Huerfano County92.1Arapahoe County: 92.1 %Arapahoe County92.1Moffat County: 92 %Moffat County92Eagle County: 91.7 %Eagle County91.7Mesa County: 91.6 %Mesa County91.6Rio Blanco County: 91.5 %Rio Blanco County91.5Logan County: 91.4 %Logan County91.4Washington County: 91.4 %Washington County91.4Montezuma County: 90.9 %Montezuma County90.9Pueblo County: 90.5 %Pueblo County90.5Denver County: 90 %Denver County90Fremont County: 89.7 %Fremont County89.7Ouray County: 98.6 %Ouray County98.6Custer County: 98.3 %Custer County98.3San Miguel County: 98.3 %San Miguel County98.3Gunnison County: 98 %Gunnison County98Mineral County: 97.9 %Mineral County97.9Douglas County: 97.9 %Douglas County97.9Teller County: 97.8 %Teller County97.8Pitkin County: 97.5 %Pitkin County97.5Park County: 97.5 %Park County97.5Clear Creek County: 97.4 %Clear Creek County97.4Kiowa County: 97.1 %Kiowa County97.1Routt County: 96.7 %Routt County96.7La Plata County: 96.6 %La Plata County96.6Broomfield County: 96.6 %Broomfield County96.6San Juan County: 96.6 %San Juan County96.6Dolores County: 96.4 %Dolores County96.4Hinsdale County: 96.4 %Hinsdale County96.4Elbert County: 96.4 %Elbert County96.4Larimer County: 96.3 %Larimer County96.3Boulder County: 95.5 %Boulder County95.5Jefferson County: 95.1 %Jefferson County95.1Summit County: 94.5 %Summit County94.5El Paso County: 94.5 %El Paso County94.5Grand County: 94.5 %Grand County94.5Chaffee County: 94.4 %Chaffee County94.4Archuleta County: 94 %Archuleta County94Gilpin County: 93.7 %Gilpin County93.7Cheyenne County: 93 %Cheyenne County93Huerfano County: 92.1 %Huerfano County92.1Arapahoe County: 92.1 %Arapahoe County92.1Moffat County: 92 %Moffat County92Eagle County: 91.7 %Eagle County91.7Mesa County: 91.6 %Mesa County91.6Rio Blanco County: 91.5 %Rio Blanco County91.5Logan County: 91.4 %Logan County91.4Washington County: 91.4 %Washington County91.4Montezuma County: 90.9 %Montezuma County90.9Pueblo County: 90.5 %Pueblo County90.5Denver County: 90 %Denver County90Fremont County: 89.7 %Fremont County89.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Ouray County98.6
2Custer County98.3
2San Miguel County98.3
4Gunnison County98
5Mineral County97.9
6Douglas County97.9
7Teller County97.8
8Pitkin County97.5
9Park County97.5
10Clear Creek County97.4
11Kiowa County97.1
12Routt County96.7
13La Plata County96.6
14Broomfield County96.6
14San Juan County96.6
16Dolores County96.4
17Hinsdale County96.4
18Elbert County96.4
19Larimer County96.3
20Boulder County95.5
21Jefferson County95.1
22Summit County94.5
23El Paso County94.5
23Grand County94.5
25Chaffee County94.4
26Archuleta County94
27Gilpin County93.7
28Cheyenne County93
29Huerfano County92.1
30Arapahoe County92.1
31Moffat County92
32Eagle County91.7
33Mesa County91.6
34Rio Blanco County91.5
35Logan County91.4
36Washington County91.4
37Montezuma County90.9
38Pueblo County90.5
39Denver County90
40Fremont County89.7
41Delta County89.6
42Garfield County89.6
43Conejos County89.5
44Kit Carson County89.2
45Rio Grande County89.1
46Crowley County89
47Montrose County88.8
48Sedgwick County88.7
49Lincoln County88.7
50Lake County88.3
51Las Animas County88.2
52Weld County88.1
53Otero County87.8
54Yuma County87.5
55Bent County87.1
56Alamosa County87
57Costilla County86.9
58Phillips County86.8
59Saguache County86.7
60Jackson County86.1
61Baca County85.5
62Adams County84.9
63Prowers County82.2
64Morgan County80.7

Other periods

About this ranking

People aged 25 and over who hold a regular high school diploma, a GED or alternative credential, or any higher level of education, as a percentage of all people aged 25 and over. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Measures the adult population, not students: it is not the high school graduation rate of a class. Not comparable with the EU share below upper secondary education, which covers ages 25 to 64.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Colorado by high school graduate or higher, population 25 and over, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Colorado by high school graduate or higher, population 25 and over, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/colorado-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Colorado by high school graduate or higher, population 25 and over, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/colorado-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Colorado by high school graduate or higher, population 25 and over, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/colorado-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_colorado_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Colorado by high school graduate or higher, population 25 and over, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/colorado-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Colorado by high school graduate or higher, population 25 and over, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/colorado-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/colorado-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Colorado by high school graduate or higher, population 25 and over using official data, and cite the source.
rank_places {"indicator":"high_school_graduate_share","level":"province","within":"Colorado","limit":10}
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Questions

Which county has the highest high school graduate or higher, population 25 and over?

Ouray County, with 98.6% in 2021, according to the U.S. Census Bureau.

Which county has the lowest high school graduate or higher, population 25 and over?

Morgan County, with 80.7% in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

High school graduate or higher, population 25 and over: other rankings

Counties in Colorado: more rankings