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

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

Delaware County had the highest high school graduate or higher, population 25 and over of 88 counties in 2021, at 97.2%. Holmes County had the lowest, at 56.6%. The median was 90.8% and the figure for Ohio was 91.1%. Source: the U.S. Census Bureau.

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Highest97.2Delaware County
Lowest56.6Holmes County
Median90.888 counties
Ohio91.1History

Map of counties, 2021

Adams County: 83.7 %Allen County: 91.2 %Ashland County: 89.7 %Ashtabula County: 86.4 %Athens County: 90.9 %Auglaize County: 93.7 %Belmont County: 91.5 %Brown County: 86.7 %Butler County: 91.5 %Carroll County: 89.7 %Champaign County: 91.2 %Clark County: 88.7 %Clermont County: 90.5 %Clinton County: 91.2 %Columbiana County: 89.5 %Coshocton County: 84.3 %Crawford County: 90 %Cuyahoga County: 90.7 %Darke County: 91.3 %Defiance County: 92.1 %Delaware County: 97.2 %Erie County: 91.9 %Fairfield County: 93.6 %Fayette County: 84.3 %Franklin County: 91.5 %Fulton County: 93.1 %Gallia County: 85.1 %Geauga County: 90.6 %Greene County: 94 %Guernsey County: 85.9 %Hamilton County: 91.9 %Hancock County: 93.4 %Hardin County: 90.5 %Harrison County: 88.4 %Henry County: 93.6 %Highland County: 83.7 %Hocking County: 88.1 %Holmes County: 56.6 %Huron County: 90 %Jackson County: 87.5 %Jefferson County: 92.7 %Knox County: 91.7 %Lake County: 93 %Lawrence County: 89 %Licking County: 92.8 %Logan County: 92.8 %Lorain County: 90.9 %Lucas County: 90.2 %Madison County: 88.4 %Mahoning County: 91.4 %Marion County: 89.9 %Medina County: 95.1 %Meigs County: 85.1 %Mercer County: 92.9 %Miami County: 93.2 %Monroe County: 89.8 %Montgomery County: 91 %Morgan County: 84.7 %Morrow County: 89 %Muskingum County: 89.8 %Noble County: 85 %Ottawa County: 92.4 %Paulding County: 89.7 %Perry County: 88.8 %Pickaway County: 87.2 %Pike County: 85.1 %Portage County: 92.4 %Preble County: 91.4 %Putnam County: 94.6 %Richland County: 88.5 %Ross County: 88.8 %Sandusky County: 92.6 %Scioto County: 86 %Seneca County: 93 %Shelby County: 89.6 %Stark County: 92.3 %Summit County: 92.6 %Trumbull County: 89.2 %Tuscarawas County: 88.4 %Union County: 94.4 %Van Wert County: 92.9 %Vinton County: 80.3 %Warren County: 94.6 %Washington County: 91.4 %Wayne County: 86.1 %Williams County: 91.7 %Wood County: 95 %Wyandot County: 93.6 %
  • Under 87
  • 87 to 90
  • 90 to 91
  • 91 to 92
  • 92 to 93
  • 93 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

Delaware County: 97.2 %Delaware County97.2Medina County: 95.1 %Medina County95.1Wood County: 95 %Wood County95Warren County: 94.6 %Warren County94.6Putnam County: 94.6 %Putnam County94.6Union County: 94.4 %Union County94.4Greene County: 94 %Greene County94Auglaize County: 93.7 %Auglaize County93.7Wyandot County: 93.6 %Wyandot County93.6Henry County: 93.6 %Henry County93.6Fairfield County: 93.6 %Fairfield County93.6Hancock County: 93.4 %Hancock County93.4Miami County: 93.2 %Miami County93.2Fulton County: 93.1 %Fulton County93.1Lake County: 93 %Lake County93Seneca County: 93 %Seneca County93Mercer County: 92.9 %Mercer County92.9Van Wert County: 92.9 %Van Wert County92.9Licking County: 92.8 %Licking County92.8Logan County: 92.8 %Logan County92.8Jefferson County: 92.7 %Jefferson County92.7Summit County: 92.6 %Summit County92.6Sandusky County: 92.6 %Sandusky County92.6Portage County: 92.4 %Portage County92.4Ottawa County: 92.4 %Ottawa County92.4Stark County: 92.3 %Stark County92.3Defiance County: 92.1 %Defiance County92.1Hamilton County: 91.9 %Hamilton County91.9Erie County: 91.9 %Erie County91.9Knox County: 91.7 %Knox County91.7Williams County: 91.7 %Williams County91.7Belmont County: 91.5 %Belmont County91.5Butler County: 91.5 %Butler County91.5Franklin County: 91.5 %Franklin County91.5Mahoning County: 91.4 %Mahoning County91.4Washington County: 91.4 %Washington County91.4Preble County: 91.4 %Preble County91.4Darke County: 91.3 %Darke County91.3Clinton County: 91.2 %Clinton County91.2Champaign County: 91.2 %Champaign County91.2Delaware County: 97.2 %Delaware County97.2Medina County: 95.1 %Medina County95.1Wood County: 95 %Wood County95Warren County: 94.6 %Warren County94.6Putnam County: 94.6 %Putnam County94.6Union County: 94.4 %Union County94.4Greene County: 94 %Greene County94Auglaize County: 93.7 %Auglaize County93.7Wyandot County: 93.6 %Wyandot County93.6Henry County: 93.6 %Henry County93.6Fairfield County: 93.6 %Fairfield County93.6Hancock County: 93.4 %Hancock County93.4Miami County: 93.2 %Miami County93.2Fulton County: 93.1 %Fulton County93.1Lake County: 93 %Lake County93Seneca County: 93 %Seneca County93Mercer County: 92.9 %Mercer County92.9Van Wert County: 92.9 %Van Wert County92.9Licking County: 92.8 %Licking County92.8Logan County: 92.8 %Logan County92.8Jefferson County: 92.7 %Jefferson County92.7Summit County: 92.6 %Summit County92.6Sandusky County: 92.6 %Sandusky County92.6Portage County: 92.4 %Portage County92.4Ottawa County: 92.4 %Ottawa County92.4Stark County: 92.3 %Stark County92.3Defiance County: 92.1 %Defiance County92.1Hamilton County: 91.9 %Hamilton County91.9Erie County: 91.9 %Erie County91.9Knox County: 91.7 %Knox County91.7Williams County: 91.7 %Williams County91.7Belmont County: 91.5 %Belmont County91.5Butler County: 91.5 %Butler County91.5Franklin County: 91.5 %Franklin County91.5Mahoning County: 91.4 %Mahoning County91.4Washington County: 91.4 %Washington County91.4Preble County: 91.4 %Preble County91.4Darke County: 91.3 %Darke County91.3Clinton County: 91.2 %Clinton County91.2Champaign County: 91.2 %Champaign County91.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Delaware County97.2
2Medina County95.1
3Wood County95
4Warren County94.6
5Putnam County94.6
6Union County94.4
7Greene County94
8Auglaize County93.7
9Wyandot County93.6
10Henry County93.6
11Fairfield County93.6
12Hancock County93.4
13Miami County93.2
14Fulton County93.1
15Lake County93
16Seneca County93
17Mercer County92.9
18Van Wert County92.9
19Licking County92.8
20Logan County92.8
21Jefferson County92.7
22Summit County92.6
23Sandusky County92.6
24Portage County92.4
25Ottawa County92.4
26Stark County92.3
27Defiance County92.1
28Hamilton County91.9
29Erie County91.9
30Knox County91.7
31Williams County91.7
32Belmont County91.5
32Butler County91.5
34Franklin County91.5
35Mahoning County91.4
36Washington County91.4
37Preble County91.4
38Darke County91.3
39Clinton County91.2
40Champaign County91.2
41Allen County91.2
42Montgomery County91
43Athens County90.9
44Lorain County90.9
45Cuyahoga County90.7
46Geauga County90.6
47Clermont County90.5
48Hardin County90.5
49Lucas County90.2
50Crawford County90
51Huron County90
52Marion County89.9
53Monroe County89.8
54Muskingum County89.8
55Paulding County89.7
56Carroll County89.7
57Ashland County89.7
58Shelby County89.6
59Columbiana County89.5
60Trumbull County89.2
61Morrow County89
62Lawrence County89
63Perry County88.8
64Ross County88.8
65Clark County88.7
66Richland County88.5
67Harrison County88.4
68Tuscarawas County88.4
69Madison County88.4
70Hocking County88.1
71Jackson County87.5
72Pickaway County87.2
73Brown County86.7
74Ashtabula County86.4
75Wayne County86.1
76Scioto County86
77Guernsey County85.9
78Meigs County85.1
79Pike County85.1
80Gallia County85.1
81Noble County85
82Morgan County84.7
83Coshocton County84.3
84Fayette County84.3
85Highland County83.7
86Adams County83.7
87Vinton County80.3
88Holmes County56.6

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 Ohio 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 Ohio 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/ohio-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 Ohio 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/ohio-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 Ohio 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/ohio-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_ohio_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 Ohio 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/ohio-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 Ohio 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/ohio-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/ohio-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 Ohio 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":"Ohio","limit":10}
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Questions

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

Delaware County, with 97.2% in 2021, according to the U.S. Census Bureau.

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

Holmes County, with 56.6% 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 Ohio: more rankings