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 2024, at 30.3%. Athens County had the lowest, at 14.8%. The median was 21.9% and the figure for Ohio was 21.5%. Source: the U.S. Census Bureau.

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Highest30.3Holmes County
Lowest14.8Athens County
Median21.988 counties
Ohio21.5History

Map of counties, 2024

Adams County: 24 %Allen County: 22.9 %Ashland County: 22.3 %Ashtabula County: 21.4 %Athens County: 14.8 %Auglaize County: 22.9 %Belmont County: 18.6 %Brown County: 22.6 %Butler County: 22.5 %Carroll County: 20.5 %Champaign County: 21.8 %Clark County: 22 %Clermont County: 21.6 %Clinton County: 21.9 %Columbiana County: 19.6 %Coshocton County: 23.9 %Crawford County: 21 %Cuyahoga County: 19.8 %Darke County: 23.2 %Defiance County: 22.5 %Delaware County: 24.2 %Erie County: 19 %Fairfield County: 23.6 %Fayette County: 22.6 %Franklin County: 22.6 %Fulton County: 22.4 %Gallia County: 23.3 %Geauga County: 21.5 %Greene County: 20.5 %Guernsey County: 21.9 %Hamilton County: 22.1 %Hancock County: 21.4 %Hardin County: 23.1 %Harrison County: 21.2 %Henry County: 22.7 %Highland County: 23.6 %Hocking County: 20.9 %Holmes County: 30.3 %Huron County: 22.6 %Jackson County: 23.5 %Jefferson County: 19.5 %Knox County: 22.5 %Lake County: 18.5 %Lawrence County: 21.3 %Licking County: 22.3 %Logan County: 22 %Lorain County: 21 %Lucas County: 22 %Madison County: 20.1 %Mahoning County: 19.8 %Marion County: 21.3 %Medina County: 20.7 %Meigs County: 20.4 %Mercer County: 25.6 %Miami County: 22.6 %Monroe County: 19.8 %Montgomery County: 21.6 %Morgan County: 20.5 %Morrow County: 22.1 %Muskingum County: 22.4 %Noble County: 18.8 %Ottawa County: 17.1 %Paulding County: 23.2 %Perry County: 23.4 %Pickaway County: 22 %Pike County: 23.7 %Portage County: 17.7 %Preble County: 21.8 %Putnam County: 25 %Richland County: 21 %Ross County: 20.6 %Sandusky County: 21.3 %Scioto County: 21.4 %Seneca County: 21.2 %Shelby County: 24.3 %Stark County: 21.1 %Summit County: 20.2 %Trumbull County: 19.9 %Tuscarawas County: 22.7 %Union County: 24.4 %Van Wert County: 23.2 %Vinton County: 21.9 %Warren County: 23.4 %Washington County: 19.4 %Wayne County: 23.4 %Williams County: 21.4 %Wood County: 19.9 %Wyandot County: 21.6 %
  • Under 20
  • 20 to 21
  • 21 to 22
  • 22 to 23
  • 23 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

Holmes County: 30.3 %Holmes County30.3Mercer County: 25.6 %Mercer County25.6Putnam County: 25 %Putnam County25Union County: 24.4 %Union County24.4Shelby County: 24.3 %Shelby County24.3Delaware County: 24.2 %Delaware County24.2Adams County: 24 %Adams County24Coshocton County: 23.9 %Coshocton County23.9Pike County: 23.7 %Pike County23.7Highland County: 23.6 %Highland County23.6Fairfield County: 23.6 %Fairfield County23.6Jackson County: 23.5 %Jackson County23.5Perry County: 23.4 %Perry County23.4Wayne County: 23.4 %Wayne County23.4Warren County: 23.4 %Warren County23.4Gallia County: 23.3 %Gallia County23.3Van Wert County: 23.2 %Van Wert County23.2Paulding County: 23.2 %Paulding County23.2Darke County: 23.2 %Darke County23.2Hardin County: 23.1 %Hardin County23.1Allen County: 22.9 %Allen County22.9Auglaize County: 22.9 %Auglaize County22.9Tuscarawas County: 22.7 %Tuscarawas County22.7Henry County: 22.7 %Henry County22.7Franklin County: 22.6 %Franklin County22.6Brown County: 22.6 %Brown County22.6Fayette County: 22.6 %Fayette County22.6Miami County: 22.6 %Miami County22.6Huron County: 22.6 %Huron County22.6Butler County: 22.5 %Butler County22.5Knox County: 22.5 %Knox County22.5Defiance County: 22.5 %Defiance County22.5Muskingum County: 22.4 %Muskingum County22.4Fulton County: 22.4 %Fulton County22.4Ashland County: 22.3 %Ashland County22.3Licking County: 22.3 %Licking County22.3Morrow County: 22.1 %Morrow County22.1Hamilton County: 22.1 %Hamilton County22.1Clark County: 22 %Clark County22Pickaway County: 22 %Pickaway County22Holmes County: 30.3 %Holmes County30.3Mercer County: 25.6 %Mercer County25.6Putnam County: 25 %Putnam County25Union County: 24.4 %Union County24.4Shelby County: 24.3 %Shelby County24.3Delaware County: 24.2 %Delaware County24.2Adams County: 24 %Adams County24Coshocton County: 23.9 %Coshocton County23.9Pike County: 23.7 %Pike County23.7Highland County: 23.6 %Highland County23.6Fairfield County: 23.6 %Fairfield County23.6Jackson County: 23.5 %Jackson County23.5Perry County: 23.4 %Perry County23.4Wayne County: 23.4 %Wayne County23.4Warren County: 23.4 %Warren County23.4Gallia County: 23.3 %Gallia County23.3Van Wert County: 23.2 %Van Wert County23.2Paulding County: 23.2 %Paulding County23.2Darke County: 23.2 %Darke County23.2Hardin County: 23.1 %Hardin County23.1Allen County: 22.9 %Allen County22.9Auglaize County: 22.9 %Auglaize County22.9Tuscarawas County: 22.7 %Tuscarawas County22.7Henry County: 22.7 %Henry County22.7Franklin County: 22.6 %Franklin County22.6Brown County: 22.6 %Brown County22.6Fayette County: 22.6 %Fayette County22.6Miami County: 22.6 %Miami County22.6Huron County: 22.6 %Huron County22.6Butler County: 22.5 %Butler County22.5Knox County: 22.5 %Knox County22.5Defiance County: 22.5 %Defiance County22.5Muskingum County: 22.4 %Muskingum County22.4Fulton County: 22.4 %Fulton County22.4Ashland County: 22.3 %Ashland County22.3Licking County: 22.3 %Licking County22.3Morrow County: 22.1 %Morrow County22.1Hamilton County: 22.1 %Hamilton County22.1Clark County: 22 %Clark County22Pickaway County: 22 %Pickaway County22
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Holmes County30.3-0 pts
2Mercer County25.6-0 pts
3Putnam County25-0.3 pts
4Union County24.4-0.2 pts
5Shelby County24.3-0.1 pts
6Delaware County24.2-0.6 pts
7Adams County24-0.1 pts
8Coshocton County23.9-0.2 pts
9Pike County23.7-0.1 pts
10Highland County23.6-0.2 pts
11Fairfield County23.6-0.3 pts
12Jackson County23.5-0.2 pts
13Perry County23.4-0.2 pts
14Wayne County23.4-0.2 pts
15Warren County23.4-0.3 pts
16Gallia County23.3-0.2 pts
17Van Wert County23.2-0.2 pts
18Paulding County23.2-0.4 pts
19Darke County23.2-0.2 pts
20Hardin County23.10 pts
21Allen County22.9-0.1 pts
22Auglaize County22.9-0.3 pts
23Tuscarawas County22.7+0.1 pts
24Henry County22.7-0.2 pts
25Franklin County22.6-0.1 pts
26Brown County22.6-0 pts
27Fayette County22.6-0.6 pts
28Miami County22.6-0.2 pts
29Huron County22.6-0.4 pts
30Butler County22.5-0.3 pts
31Knox County22.5-0.1 pts
32Defiance County22.5-0.1 pts
33Muskingum County22.4-0.2 pts
34Fulton County22.4-0.4 pts
35Ashland County22.30 pts
36Licking County22.3-0.2 pts
37Morrow County22.1-0.1 pts
38Hamilton County22.1-0.1 pts
39Clark County22-0.1 pts
40Pickaway County22-0.2 pts
41Lucas County22-0.2 pts
42Logan County22-0.3 pts
43Clinton County21.9-0.2 pts
44Vinton County21.9+0.1 pts
45Guernsey County21.9-0 pts
46Champaign County21.8-0.4 pts
47Preble County21.8-0.4 pts
48Montgomery County21.6-0.1 pts
49Clermont County21.6-0.3 pts
50Wyandot County21.6-0.3 pts
51Geauga County21.5-0.3 pts
52Williams County21.4-0.2 pts
53Scioto County21.4-0.2 pts
54Hancock County21.4-0.3 pts
55Ashtabula County21.4-0.2 pts
56Marion County21.3-0 pts
57Lawrence County21.3-0.4 pts
58Sandusky County21.3-0.3 pts
59Harrison County21.2-0 pts
60Seneca County21.2-0.2 pts
61Stark County21.1-0.2 pts
62Richland County21-0.3 pts
63Crawford County21-0 pts
64Lorain County21-0.2 pts
65Hocking County20.9-0.3 pts
66Medina County20.7-0.4 pts
67Ross County20.6-0.2 pts
68Carroll County20.5-0.4 pts
69Morgan County20.5-0.2 pts
70Greene County20.5-0.1 pts
71Meigs County20.4-0.4 pts
72Summit County20.2-0.2 pts
73Madison County20.1-0.3 pts
74Trumbull County19.9-0.1 pts
75Wood County19.9-0.3 pts
76Monroe County19.8-0.3 pts
77Cuyahoga County19.8-0.2 pts
78Mahoning County19.8-0.1 pts
79Columbiana County19.6-0.3 pts
80Jefferson County19.5-0.1 pts
81Washington County19.4-0.1 pts
82Erie County19-0.2 pts
83Noble County18.8-0.3 pts
84Belmont County18.6-0.3 pts
85Lake County18.5-0.3 pts
86Portage County17.7-0.3 pts
87Ottawa County17.1-0.2 pts
88Athens County14.8-0.1 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, 2024) [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, 2024. 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=2024. 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, 2024. 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=2024.

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, 2024 [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=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_ohio_by_2024,
  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, 2024}},
  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=2024. 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, 2024
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=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2024.
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 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Athens County, with 14.8% in 2024.

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