Data / Rankings / Population under 18 / Counties in Ohio

Counties in Ohio by population under 18

Holmes County had the highest population under 18 of 88 counties in 2023, at 30.3%. Athens County had the lowest, at 15%. The median was 22.1% and the figure for Ohio was 21.7%. Source: the U.S. Census Bureau.

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Highest30.3Holmes County
Lowest15Athens County
Median22.188 counties
Ohio21.7History

Map of counties, 2023

Adams County: 24.1 %Allen County: 23.1 %Ashland County: 22.3 %Ashtabula County: 21.6 %Athens County: 15 %Auglaize County: 23.2 %Belmont County: 18.9 %Brown County: 22.6 %Butler County: 22.8 %Carroll County: 20.9 %Champaign County: 22.2 %Clark County: 22.2 %Clermont County: 21.9 %Clinton County: 22 %Columbiana County: 19.9 %Coshocton County: 24.1 %Crawford County: 21 %Cuyahoga County: 20 %Darke County: 23.3 %Defiance County: 22.6 %Delaware County: 24.8 %Erie County: 19.1 %Fairfield County: 23.9 %Fayette County: 23.2 %Franklin County: 22.8 %Fulton County: 22.8 %Gallia County: 23.5 %Geauga County: 21.8 %Greene County: 20.6 %Guernsey County: 21.9 %Hamilton County: 22.2 %Hancock County: 21.7 %Hardin County: 23.1 %Harrison County: 21.2 %Henry County: 22.9 %Highland County: 23.8 %Hocking County: 21.2 %Holmes County: 30.3 %Huron County: 23 %Jackson County: 23.7 %Jefferson County: 19.6 %Knox County: 22.6 %Lake County: 18.7 %Lawrence County: 21.7 %Licking County: 22.5 %Logan County: 22.2 %Lorain County: 21.2 %Lucas County: 22.2 %Madison County: 20.4 %Mahoning County: 19.8 %Marion County: 21.3 %Medina County: 21.1 %Meigs County: 20.9 %Mercer County: 25.6 %Miami County: 22.8 %Monroe County: 20.1 %Montgomery County: 21.7 %Morgan County: 20.7 %Morrow County: 22.2 %Muskingum County: 22.6 %Noble County: 19.1 %Ottawa County: 17.3 %Paulding County: 23.6 %Perry County: 23.7 %Pickaway County: 22.2 %Pike County: 23.7 %Portage County: 17.9 %Preble County: 22.1 %Putnam County: 25.3 %Richland County: 21.4 %Ross County: 20.8 %Sandusky County: 21.5 %Scioto County: 21.6 %Seneca County: 21.4 %Shelby County: 24.3 %Stark County: 21.2 %Summit County: 20.4 %Trumbull County: 20.1 %Tuscarawas County: 22.6 %Union County: 24.6 %Van Wert County: 23.4 %Vinton County: 21.8 %Warren County: 23.7 %Washington County: 19.5 %Wayne County: 23.6 %Williams County: 21.7 %Wood County: 20.2 %Wyandot County: 21.8 %
  • Under 20
  • 20 to 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

Holmes County: 30.3 %Holmes County30.3Mercer County: 25.6 %Mercer County25.6Putnam County: 25.3 %Putnam County25.3Delaware County: 24.8 %Delaware County24.8Union County: 24.6 %Union County24.6Shelby County: 24.3 %Shelby County24.3Coshocton County: 24.1 %Coshocton County24.1Adams County: 24.1 %Adams County24.1Fairfield County: 23.9 %Fairfield County23.9Highland County: 23.8 %Highland County23.8Pike County: 23.7 %Pike County23.7Warren County: 23.7 %Warren County23.7Jackson County: 23.7 %Jackson County23.7Perry County: 23.7 %Perry County23.7Paulding County: 23.6 %Paulding County23.6Wayne County: 23.6 %Wayne County23.6Gallia County: 23.5 %Gallia County23.5Van Wert County: 23.4 %Van Wert County23.4Darke County: 23.3 %Darke County23.3Auglaize County: 23.2 %Auglaize County23.2Fayette County: 23.2 %Fayette County23.2Allen County: 23.1 %Allen County23.1Hardin County: 23.1 %Hardin County23.1Huron County: 23 %Huron County23Henry County: 22.9 %Henry County22.9Butler County: 22.8 %Butler County22.8Miami County: 22.8 %Miami County22.8Franklin County: 22.8 %Franklin County22.8Fulton County: 22.8 %Fulton County22.8Tuscarawas County: 22.6 %Tuscarawas County22.6Knox County: 22.6 %Knox County22.6Defiance County: 22.6 %Defiance County22.6Brown County: 22.6 %Brown County22.6Muskingum County: 22.6 %Muskingum County22.6Licking County: 22.5 %Licking County22.5Ashland County: 22.3 %Ashland County22.3Morrow County: 22.2 %Morrow County22.2Lucas County: 22.2 %Lucas County22.2Pickaway County: 22.2 %Pickaway County22.2Logan County: 22.2 %Logan County22.2Holmes County: 30.3 %Holmes County30.3Mercer County: 25.6 %Mercer County25.6Putnam County: 25.3 %Putnam County25.3Delaware County: 24.8 %Delaware County24.8Union County: 24.6 %Union County24.6Shelby County: 24.3 %Shelby County24.3Coshocton County: 24.1 %Coshocton County24.1Adams County: 24.1 %Adams County24.1Fairfield County: 23.9 %Fairfield County23.9Highland County: 23.8 %Highland County23.8Pike County: 23.7 %Pike County23.7Warren County: 23.7 %Warren County23.7Jackson County: 23.7 %Jackson County23.7Perry County: 23.7 %Perry County23.7Paulding County: 23.6 %Paulding County23.6Wayne County: 23.6 %Wayne County23.6Gallia County: 23.5 %Gallia County23.5Van Wert County: 23.4 %Van Wert County23.4Darke County: 23.3 %Darke County23.3Auglaize County: 23.2 %Auglaize County23.2Fayette County: 23.2 %Fayette County23.2Allen County: 23.1 %Allen County23.1Hardin County: 23.1 %Hardin County23.1Huron County: 23 %Huron County23Henry County: 22.9 %Henry County22.9Butler County: 22.8 %Butler County22.8Miami County: 22.8 %Miami County22.8Franklin County: 22.8 %Franklin County22.8Fulton County: 22.8 %Fulton County22.8Tuscarawas County: 22.6 %Tuscarawas County22.6Knox County: 22.6 %Knox County22.6Defiance County: 22.6 %Defiance County22.6Brown County: 22.6 %Brown County22.6Muskingum County: 22.6 %Muskingum County22.6Licking County: 22.5 %Licking County22.5Ashland County: 22.3 %Ashland County22.3Morrow County: 22.2 %Morrow County22.2Lucas County: 22.2 %Lucas County22.2Pickaway County: 22.2 %Pickaway County22.2Logan County: 22.2 %Logan County22.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Holmes County30.30 pts
2Mercer County25.6-0 pts
3Putnam County25.3-0 pts
4Delaware County24.8-0.4 pts
5Union County24.6-0.3 pts
6Shelby County24.3-0.2 pts
7Coshocton County24.1-0.2 pts
8Adams County24.10 pts
9Fairfield County23.9-0.2 pts
10Highland County23.8-0.2 pts
11Pike County23.7-0.2 pts
12Warren County23.7-0.2 pts
13Jackson County23.7-0.1 pts
14Perry County23.7-0 pts
15Paulding County23.6-0.2 pts
16Wayne County23.6-0.2 pts
17Gallia County23.5-0 pts
18Van Wert County23.4-0.3 pts
19Darke County23.3-0.3 pts
20Auglaize County23.2-0.2 pts
21Fayette County23.2-0.1 pts
22Allen County23.1-0.1 pts
23Hardin County23.1-0.1 pts
24Huron County23-0.3 pts
25Henry County22.9-0.1 pts
26Butler County22.8-0.4 pts
27Miami County22.8-0.2 pts
28Franklin County22.8-0.1 pts
28Fulton County22.8-0.2 pts
30Tuscarawas County22.6-0 pts
31Knox County22.6-0.2 pts
32Defiance County22.6-0.2 pts
33Brown County22.6-0 pts
34Muskingum County22.60 pts
35Licking County22.5-0.2 pts
36Ashland County22.3-0.1 pts
37Morrow County22.2-0.1 pts
38Lucas County22.2-0.2 pts
39Pickaway County22.2-0.2 pts
40Logan County22.2-0 pts
41Hamilton County22.2-0.1 pts
42Champaign County22.2-0.2 pts
43Clark County22.2-0.1 pts
44Preble County22.1-0.2 pts
45Clinton County220 pts
46Guernsey County21.9+0.2 pts
47Clermont County21.9-0.4 pts
48Wyandot County21.8-0.2 pts
49Vinton County21.8-0 pts
50Geauga County21.8-0.3 pts
51Montgomery County21.70 pts
52Lawrence County21.7-0.2 pts
53Hancock County21.7-0.1 pts
54Williams County21.7-0.1 pts
55Scioto County21.6-0.1 pts
56Ashtabula County21.6-0.1 pts
57Sandusky County21.5-0.3 pts
58Seneca County21.4-0.2 pts
59Richland County21.4-0.2 pts
60Marion County21.3-0 pts
61Harrison County21.2-0.2 pts
62Hocking County21.2-0.3 pts
63Stark County21.2-0.1 pts
64Lorain County21.2-0.2 pts
65Medina County21.1-0.3 pts
66Crawford County21-0.2 pts
67Carroll County20.9+0.2 pts
68Meigs County20.9-0.2 pts
69Ross County20.8-0.3 pts
70Morgan County20.7-0.2 pts
71Greene County20.6-0.3 pts
72Madison County20.4-0.6 pts
73Summit County20.4-0.1 pts
74Wood County20.2-0.3 pts
75Monroe County20.10 pts
76Trumbull County20.1-0.1 pts
77Cuyahoga County20-0.2 pts
78Columbiana County19.9-0.2 pts
79Mahoning County19.80 pts
80Jefferson County19.6+0.1 pts
81Washington County19.5-0.1 pts
82Erie County19.1-0.3 pts
83Noble County19.10 pts
84Belmont County18.9-0.2 pts
85Lake County18.7-0.2 pts
86Portage County17.9-0.2 pts
87Ottawa County17.3-0.4 pts
88Athens County15-0.4 pts

Other periods

About this ranking

Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. 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). Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in Ohio by population under 18, 2023) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Ohio by population under 18, 2023. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in Ohio by population under 18, 2023. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2023.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Ohio by population under 18, 2023 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/ohio-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_ohio_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Ohio by population under 18, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2023. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Ohio by population under 18, 2023
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-under-18/ohio-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Rank Counties in Ohio by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Holmes County, with 30.3% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Athens County, with 15% in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population under 18: other rankings

Counties in Ohio: more rankings