Ranking of Oklahoma 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 Oklahoma (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 11.25%. Among all Oklahoma counties, Texas County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (26.81%), followed by Tillman County (21.01%), and Adair County (19.02%).
The chart below shows the top 10 Oklahoma counties, and the table below shows the ranking of all Oklahoma 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: Oklahoma ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Oklahoma 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 | Texas County | 26.81 |
| 2 | Tillman County | 21.01 |
| 3 | Adair County | 19.02 |
| 4 | Marshall County | 18.73 |
| 5 | Harmon County | 18.26 |
| 6 | Okfuskee County | 18.22 |
| 7 | Sequoyah County | 17.46 |
| 8 | Greer County | 17.07 |
| 9 | Blaine County | 17.01 |
| 10 | Hughes County | 16.66 |
| 11 | Jefferson County | 16.52 |
| 12 | Cotton County | 16.38 |
| 13 | Choctaw County | 16.34 |
| 14 | Atoka County | 16.31 |
| 15 | Seminole County | 15.98 |
| 16 | McCurtain County | 15.94 |
| 17 | Le Flore County | 15.78 |
| 18 | Love County | 15.71 |
| 19 | Haskell County | 15.31 |
| 20 | Beaver County | 15.12 |
| 20 | Coal County | 15.12 |
| 21 | Delaware County | 14.83 |
| 22 | Beckham County | 14.80 |
| 23 | Pushmataha County | 14.48 |
| 24 | Alfalfa County | 14.45 |
| 25 | Murray County | 14.35 |
| 26 | Caddo County | 14.34 |
| 27 | Kiowa County | 13.96 |
| 28 | Cimarron County | 13.82 |
| 29 | Muskogee County | 13.71 |
| 30 | McIntosh County | 13.70 |
| 30 | Ottawa County | 13.70 |
| 31 | Jackson County | 13.63 |
| 32 | Latimer County | 13.56 |
| 33 | Okmulgee County | 13.42 |
| 34 | Craig County | 13.14 |
| 35 | Pittsburg County | 12.98 |
| 36 | Bryan County | 12.89 |
| 37 | Johnston County | 12.83 |
| 38 | Carter County | 12.81 |
| 39 | Ellis County | 12.21 |
| 40 | Stephens County | 12.13 |
| 41 | Woodward County | 12.10 |
| 42 | Mayes County | 11.95 |
| 43 | Garvin County | 11.83 |
| 44 | Garfield County | 11.81 |
| 45 | Cherokee County | 11.80 |
| 46 | Custer County | 11.78 |
| 47 | Kay County | 11.73 |
| 48 | Oklahoma County | 11.58 |
| 49 | Pottawatomie County | 11.34 |
| 50 | Pawnee County | 11.21 |
| 51 | Lincoln County | 11.01 |
| 52 | Nowata County | 10.89 |
| 53 | Kingfisher County | 10.79 |
| 54 | Harper County | 10.76 |
| 55 | McClain County | 10.69 |
| 56 | Osage County | 10.68 |
| 57 | Pontotoc County | 10.59 |
| 58 | Major County | 10.46 |
| 59 | Noble County | 10.45 |
| 60 | Washita County | 10.44 |
| 61 | Creek County | 10.20 |
| 62 | Tulsa County | 10.17 |
| 63 | Grady County | 9.76 |
| 64 | Washington County | 9.49 |
| 65 | Comanche County | 9.40 |
| 66 | Grant County | 9.06 |
| 67 | Wagoner County | 9.00 |
| 68 | Roger Mills County | 8.71 |
| 69 | Woods County | 8.50 |
| 70 | Logan County | 8.36 |
| 71 | Rogers County | 8.14 |
| 72 | Cleveland County | 7.99 |
| 73 | Canadian County | 7.94 |
| 74 | Payne County | 7.92 |
| 75 | Dewey County | 7.40 |