Ranking of Ohio 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 Ohio (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 8.86%. Among all Ohio counties, Holmes County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (43.44%), followed by Vinton County (19.76%), and Adams County (16.33%).
The chart below shows the top 10 Ohio counties, and the table below shows the ranking of all Ohio 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: Ohio ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Ohio 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 | Holmes County | 43.44 |
| 2 | Vinton County | 19.76 |
| 3 | Adams County | 16.33 |
| 4 | Highland County | 16.27 |
| 5 | Fayette County | 15.75 |
| 6 | Coshocton County | 15.72 |
| 7 | Morgan County | 15.31 |
| 8 | Noble County | 14.98 |
| 9 | Gallia County | 14.91 |
| 10 | Pike County | 14.88 |
| 11 | Meigs County | 14.87 |
| 12 | Guernsey County | 14.13 |
| 13 | Scioto County | 14.02 |
| 14 | Wayne County | 13.92 |
| 15 | Ashtabula County | 13.61 |
| 16 | Brown County | 13.28 |
| 17 | Pickaway County | 12.81 |
| 18 | Jackson County | 12.55 |
| 19 | Hocking County | 11.89 |
| 20 | Madison County | 11.65 |
| 21 | Tuscarawas County | 11.63 |
| 22 | Harrison County | 11.62 |
| 23 | Richland County | 11.55 |
| 24 | Clark County | 11.26 |
| 25 | Ross County | 11.21 |
| 26 | Perry County | 11.16 |
| 27 | Lawrence County | 11.05 |
| 28 | Morrow County | 11.04 |
| 29 | Trumbull County | 10.79 |
| 30 | Columbiana County | 10.49 |
| 31 | Shelby County | 10.38 |
| 32 | Ashland County | 10.32 |
| 33 | Carroll County | 10.28 |
| 34 | Paulding County | 10.26 |
| 35 | Muskingum County | 10.18 |
| 36 | Monroe County | 10.16 |
| 37 | Marion County | 10.06 |
| 38 | Huron County | 10.05 |
| 39 | Crawford County | 9.97 |
| 40 | Lucas County | 9.84 |
| 41 | Hardin County | 9.55 |
| 42 | Clermont County | 9.46 |
| 43 | Geauga County | 9.41 |
| 44 | Cuyahoga County | 9.28 |
| 45 | Lorain County | 9.10 |
| 46 | Athens County | 9.08 |
| 47 | Montgomery County | 8.97 |
| 48 | Allen County | 8.85 |
| 49 | Champaign County | 8.81 |
| 50 | Clinton County | 8.79 |
| 51 | Darke County | 8.73 |
| 52 | Preble County | 8.65 |
| 53 | Washington County | 8.60 |
| 54 | Mahoning County | 8.57 |
| 55 | Franklin County | 8.54 |
| 56 | Belmont County | 8.48 |
| 56 | Butler County | 8.48 |
| 57 | Williams County | 8.31 |
| 58 | Knox County | 8.26 |
| 59 | Erie County | 8.10 |
| 60 | Hamilton County | 8.06 |
| 61 | Defiance County | 7.89 |
| 62 | Stark County | 7.70 |
| 63 | Ottawa County | 7.64 |
| 64 | Portage County | 7.60 |
| 65 | Sandusky County | 7.41 |
| 66 | Summit County | 7.38 |
| 67 | Jefferson County | 7.28 |
| 68 | Logan County | 7.19 |
| 69 | Licking County | 7.17 |
| 70 | Van Wert County | 7.12 |
| 71 | Mercer County | 7.09 |
| 72 | Seneca County | 6.98 |
| 73 | Lake County | 6.96 |
| 74 | Fulton County | 6.89 |
| 75 | Miami County | 6.82 |
| 76 | Hancock County | 6.56 |
| 77 | Fairfield County | 6.45 |
| 78 | Henry County | 6.43 |
| 79 | Wyandot County | 6.37 |
| 80 | Auglaize County | 6.32 |
| 81 | Greene County | 5.98 |
| 82 | Union County | 5.64 |
| 83 | Putnam County | 5.42 |
| 84 | Warren County | 5.40 |
| 85 | Wood County | 5.04 |
| 86 | Medina County | 4.93 |
| 87 | Delaware County | 2.79 |