Data / Rankings / Population under 18 / Counties in Ohio

Counties in Ohio by population under 18, 2025

Holmes County had the highest population under 18 of 88 counties in 2025, at 30.2%. Athens County had the lowest, at 14.6%. The median was 21.7% and the figure for Ohio was 21.3%. Source: the U.S. Census Bureau.

Highest30.2Holmes County
Lowest14.6Athens County
Median21.788 counties
Ohio21.3History

Top 40 counties, 2025

Holmes County: 30.2 %Holmes County30.2Mercer County: 25.7 %Mercer County25.7Putnam County: 24.9 %Putnam County24.9Union County: 24 %Union County24Shelby County: 24 %Shelby County24Coshocton County: 23.8 %Coshocton County23.8Adams County: 23.7 %Adams County23.7Delaware County: 23.7 %Delaware County23.7Jackson County: 23.4 %Jackson County23.4Pike County: 23.4 %Pike County23.4Highland County: 23.4 %Highland County23.4Fairfield County: 23.4 %Fairfield County23.4Perry County: 23.2 %Perry County23.2Gallia County: 23.1 %Gallia County23.1Hardin County: 23 %Hardin County23Wayne County: 23 %Wayne County23Warren County: 23 %Warren County23Darke County: 23 %Darke County23Van Wert County: 22.9 %Van Wert County22.9Paulding County: 22.7 %Paulding County22.7Allen County: 22.7 %Allen County22.7Auglaize County: 22.7 %Auglaize County22.7Tuscarawas County: 22.6 %Tuscarawas County22.6Henry County: 22.5 %Henry County22.5Franklin County: 22.5 %Franklin County22.5Brown County: 22.4 %Brown County22.4Fayette County: 22.4 %Fayette County22.4Miami County: 22.4 %Miami County22.4Knox County: 22.3 %Knox County22.3Huron County: 22.3 %Huron County22.3Muskingum County: 22.3 %Muskingum County22.3Defiance County: 22.3 %Defiance County22.3Butler County: 22.2 %Butler County22.2Vinton County: 22.1 %Vinton County22.1Licking County: 22.1 %Licking County22.1Ashland County: 22 %Ashland County22Fulton County: 22 %Fulton County22Guernsey County: 22 %Guernsey County22Hamilton County: 21.9 %Hamilton County21.9Clark County: 21.9 %Clark County21.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Holmes County30.2-0 pts
2Mercer County25.7+0.1 pts
3Putnam County24.9-0.1 pts
4Union County24-0.4 pts
5Shelby County24-0.3 pts
6Coshocton County23.8-0.1 pts
7Adams County23.7-0.2 pts
8Delaware County23.7-0.6 pts
9Jackson County23.4-0 pts
10Pike County23.4-0.3 pts
11Highland County23.4-0.2 pts
12Fairfield County23.4-0.3 pts
13Perry County23.2-0.2 pts
14Gallia County23.1-0.1 pts
15Hardin County23-0 pts
16Wayne County23-0.4 pts
17Warren County23-0.4 pts
18Darke County23-0.2 pts
19Van Wert County22.9-0.3 pts
20Paulding County22.7-0.4 pts
21Allen County22.7-0.2 pts
22Auglaize County22.7-0.2 pts
23Tuscarawas County22.6-0.1 pts
24Henry County22.5-0.2 pts
25Franklin County22.5-0.1 pts
26Brown County22.4-0.2 pts
27Fayette County22.4-0.2 pts
28Miami County22.4-0.2 pts
29Knox County22.3-0.2 pts
30Huron County22.3-0.2 pts
31Muskingum County22.3-0.1 pts
32Defiance County22.3-0.2 pts
33Butler County22.2-0.3 pts
34Vinton County22.1+0.2 pts
35Licking County22.1-0.2 pts
36Ashland County22-0.3 pts
37Fulton County22-0.4 pts
38Guernsey County22+0.1 pts
39Hamilton County21.9-0.2 pts
40Clark County21.9-0.2 pts
41Morrow County21.8-0.2 pts
42Logan County21.8-0.2 pts
43Pickaway County21.8-0.2 pts
44Lucas County21.7-0.2 pts
45Clinton County21.7-0.2 pts
46Champaign County21.6-0.2 pts
47Wyandot County21.5-0.1 pts
48Preble County21.5-0.3 pts
49Montgomery County21.5-0.2 pts
50Geauga County21.4-0.1 pts
51Marion County21.4+0.1 pts
52Williams County21.3-0.1 pts
53Scioto County21.3-0.1 pts
54Hancock County21.3-0.1 pts
55Clermont County21.2-0.4 pts
56Ashtabula County21.1-0.3 pts
57Crawford County21-0 pts
58Sandusky County20.9-0.4 pts
59Lawrence County20.9-0.4 pts
60Stark County20.9-0.2 pts
61Richland County20.9-0.1 pts
62Harrison County20.9-0.4 pts
63Seneca County20.9-0.3 pts
64Morgan County20.8+0.3 pts
65Lorain County20.7-0.3 pts
66Hocking County20.6-0.3 pts
67Carroll County20.5-0 pts
68Medina County20.4-0.3 pts
69Ross County20.3-0.3 pts
70Greene County20.3-0.2 pts
71Meigs County20.2-0.2 pts
72Summit County20-0.2 pts
73Madison County19.9-0.2 pts
74Trumbull County19.7-0.2 pts
75Monroe County19.7-0.1 pts
76Mahoning County19.6-0.1 pts
77Cuyahoga County19.6-0.2 pts
77Wood County19.6-0.3 pts
79Columbiana County19.5-0.2 pts
80Jefferson County19.3-0.2 pts
81Washington County19.2-0.2 pts
82Noble County18.6-0.2 pts
83Erie County18.6-0.4 pts
84Belmont County18.2-0.4 pts
85Lake County18.2-0.2 pts
86Portage County17.4-0.3 pts
87Ottawa County16.8-0.3 pts
88Athens County14.6-0.3 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, 2025) [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, 2025. 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. 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, 2025. 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.

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, 2025 [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 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_ohio_by_2025,
  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, 2025}},
  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. 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, 2025
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties.
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 30.2% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Athens County, with 14.6% in 2025.

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