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 2017, at 32%. Athens County had the lowest, at 15.6%. The median was 22.8% and the figure for Ohio was 22.4%. Source: the U.S. Census Bureau.

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Highest32Holmes County
Lowest15.6Athens County
Median22.888 counties
Ohio22.4History

Map of counties, 2017

Adams County: 24 %Allen County: 23.4 %Ashland County: 22.9 %Ashtabula County: 22.1 %Athens County: 15.6 %Auglaize County: 24.1 %Belmont County: 19.2 %Brown County: 23 %Butler County: 23.8 %Carroll County: 21.1 %Champaign County: 23.1 %Clark County: 22.7 %Clermont County: 23.7 %Clinton County: 23 %Columbiana County: 20.5 %Coshocton County: 23.9 %Crawford County: 21.4 %Cuyahoga County: 20.8 %Darke County: 23.8 %Defiance County: 23.4 %Delaware County: 27.6 %Erie County: 20.4 %Fairfield County: 24.4 %Fayette County: 23.7 %Franklin County: 23.2 %Fulton County: 24 %Gallia County: 23.1 %Geauga County: 23.2 %Greene County: 21 %Guernsey County: 22.1 %Hamilton County: 22.7 %Hancock County: 22.4 %Hardin County: 22.9 %Harrison County: 21.6 %Henry County: 23.4 %Highland County: 24.2 %Hocking County: 22.2 %Holmes County: 32 %Huron County: 24.1 %Jackson County: 23.7 %Jefferson County: 19.4 %Knox County: 22.9 %Lake County: 20.2 %Lawrence County: 22.1 %Licking County: 23.3 %Logan County: 22.8 %Lorain County: 22.3 %Lucas County: 22.8 %Madison County: 21.2 %Mahoning County: 20 %Marion County: 20.8 %Medina County: 22.8 %Meigs County: 21.9 %Mercer County: 25.3 %Miami County: 23.4 %Monroe County: 20.5 %Montgomery County: 22.1 %Morgan County: 21.2 %Morrow County: 24 %Muskingum County: 22.8 %Noble County: 18.7 %Ottawa County: 19.1 %Paulding County: 24.2 %Perry County: 24.1 %Pickaway County: 22.4 %Pike County: 24.1 %Portage County: 19 %Preble County: 23 %Putnam County: 25.5 %Richland County: 21.7 %Ross County: 21.2 %Sandusky County: 22.7 %Scioto County: 21.6 %Seneca County: 22.3 %Shelby County: 25.4 %Stark County: 21.7 %Summit County: 21.1 %Trumbull County: 20.3 %Tuscarawas County: 22.8 %Union County: 25.8 %Van Wert County: 23.8 %Vinton County: 22.5 %Warren County: 25.6 %Washington County: 20 %Wayne County: 24.4 %Williams County: 22.7 %Wood County: 20.6 %Wyandot County: 22.9 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

Holmes County: 32 %Holmes County32Delaware County: 27.6 %Delaware County27.6Union County: 25.8 %Union County25.8Warren County: 25.6 %Warren County25.6Putnam County: 25.5 %Putnam County25.5Shelby County: 25.4 %Shelby County25.4Mercer County: 25.3 %Mercer County25.3Wayne County: 24.4 %Wayne County24.4Fairfield County: 24.4 %Fairfield County24.4Highland County: 24.2 %Highland County24.2Paulding County: 24.2 %Paulding County24.2Pike County: 24.1 %Pike County24.1Auglaize County: 24.1 %Auglaize County24.1Huron County: 24.1 %Huron County24.1Perry County: 24.1 %Perry County24.1Adams County: 24 %Adams County24Fulton County: 24 %Fulton County24Morrow County: 24 %Morrow County24Coshocton County: 23.9 %Coshocton County23.9Darke County: 23.8 %Darke County23.8Van Wert County: 23.8 %Van Wert County23.8Butler County: 23.8 %Butler County23.8Jackson County: 23.7 %Jackson County23.7Fayette County: 23.7 %Fayette County23.7Clermont County: 23.7 %Clermont County23.7Henry County: 23.4 %Henry County23.4Defiance County: 23.4 %Defiance County23.4Miami County: 23.4 %Miami County23.4Allen County: 23.4 %Allen County23.4Licking County: 23.3 %Licking County23.3Franklin County: 23.2 %Franklin County23.2Geauga County: 23.2 %Geauga County23.2Gallia County: 23.1 %Gallia County23.1Champaign County: 23.1 %Champaign County23.1Brown County: 23 %Brown County23Clinton County: 23 %Clinton County23Preble County: 23 %Preble County23Ashland County: 22.9 %Ashland County22.9Wyandot County: 22.9 %Wyandot County22.9Hardin County: 22.9 %Hardin County22.9Holmes County: 32 %Holmes County32Delaware County: 27.6 %Delaware County27.6Union County: 25.8 %Union County25.8Warren County: 25.6 %Warren County25.6Putnam County: 25.5 %Putnam County25.5Shelby County: 25.4 %Shelby County25.4Mercer County: 25.3 %Mercer County25.3Wayne County: 24.4 %Wayne County24.4Fairfield County: 24.4 %Fairfield County24.4Highland County: 24.2 %Highland County24.2Paulding County: 24.2 %Paulding County24.2Pike County: 24.1 %Pike County24.1Auglaize County: 24.1 %Auglaize County24.1Huron County: 24.1 %Huron County24.1Perry County: 24.1 %Perry County24.1Adams County: 24 %Adams County24Fulton County: 24 %Fulton County24Morrow County: 24 %Morrow County24Coshocton County: 23.9 %Coshocton County23.9Darke County: 23.8 %Darke County23.8Van Wert County: 23.8 %Van Wert County23.8Butler County: 23.8 %Butler County23.8Jackson County: 23.7 %Jackson County23.7Fayette County: 23.7 %Fayette County23.7Clermont County: 23.7 %Clermont County23.7Henry County: 23.4 %Henry County23.4Defiance County: 23.4 %Defiance County23.4Miami County: 23.4 %Miami County23.4Allen County: 23.4 %Allen County23.4Licking County: 23.3 %Licking County23.3Franklin County: 23.2 %Franklin County23.2Geauga County: 23.2 %Geauga County23.2Gallia County: 23.1 %Gallia County23.1Champaign County: 23.1 %Champaign County23.1Brown County: 23 %Brown County23Clinton County: 23 %Clinton County23Preble County: 23 %Preble County23Ashland County: 22.9 %Ashland County22.9Wyandot County: 22.9 %Wyandot County22.9Hardin County: 22.9 %Hardin County22.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Holmes County32-0.4 pts
2Delaware County27.6-0.2 pts
3Union County25.8-0 pts
4Warren County25.6-0.1 pts
5Putnam County25.5-0 pts
6Shelby County25.4-0.2 pts
7Mercer County25.3-0.1 pts
8Wayne County24.40 pts
9Fairfield County24.4-0 pts
10Highland County24.2-0.2 pts
11Paulding County24.2+0.1 pts
12Pike County24.10 pts
13Auglaize County24.1-0 pts
14Huron County24.1-0 pts
15Perry County24.1-0.2 pts
16Adams County24-0.2 pts
17Fulton County24-0.2 pts
18Morrow County24-0.3 pts
19Coshocton County23.9-0.1 pts
20Darke County23.8-0 pts
21Van Wert County23.8+0.2 pts
22Butler County23.8-0.2 pts
23Jackson County23.7-0.2 pts
24Fayette County23.7-0 pts
25Clermont County23.7-0.2 pts
26Henry County23.4-0.2 pts
27Defiance County23.4-0 pts
28Miami County23.40 pts
29Allen County23.4-0.2 pts
30Licking County23.3-0.1 pts
31Franklin County23.2-0.1 pts
32Geauga County23.2-0.3 pts
33Gallia County23.1-0.1 pts
34Champaign County23.1-0.1 pts
35Brown County23-0.1 pts
36Clinton County23-0.2 pts
37Preble County23-0.1 pts
38Ashland County22.9-0.1 pts
39Wyandot County22.9-0.2 pts
40Hardin County22.9-0.1 pts
41Knox County22.9-0.1 pts
42Tuscarawas County22.80 pts
43Muskingum County22.8-0.2 pts
44Medina County22.8-0.3 pts
45Logan County22.8-0.6 pts
46Lucas County22.8-0.1 pts
47Sandusky County22.7-0.3 pts
48Hamilton County22.7-0.2 pts
49Williams County22.7-0.2 pts
50Clark County22.7-0.2 pts
51Vinton County22.5-0.2 pts
52Pickaway County22.4-0 pts
53Hancock County22.4-0.1 pts
54Lorain County22.3-0.2 pts
55Seneca County22.3-0.2 pts
56Hocking County22.2-0.2 pts
57Lawrence County22.1-0.2 pts
58Montgomery County22.1-0.1 pts
59Guernsey County22.1-0.1 pts
60Ashtabula County22.1-0.1 pts
61Meigs County21.9-0.1 pts
62Richland County21.70 pts
63Stark County21.7-0.1 pts
64Harrison County21.6+0.2 pts
65Scioto County21.6-0.2 pts
66Crawford County21.4-0.2 pts
67Ross County21.2-0.2 pts
68Morgan County21.2-0.4 pts
69Madison County21.2-0.2 pts
70Carroll County21.1-0 pts
71Summit County21.1-0.2 pts
72Greene County21-0 pts
73Cuyahoga County20.8-0.2 pts
73Marion County20.8-0.1 pts
75Wood County20.6-0.2 pts
76Monroe County20.5-0.5 pts
77Columbiana County20.5-0.2 pts
78Erie County20.4-0.1 pts
79Trumbull County20.3-0.2 pts
80Lake County20.2-0.2 pts
81Mahoning County20-0.1 pts
82Washington County20-0.1 pts
83Jefferson County19.4-0.2 pts
84Belmont County19.2-0 pts
85Ottawa County19.1-0.1 pts
86Portage County19-0.2 pts
87Noble County18.7-0.1 pts
88Athens County15.6-0 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_ohio_by_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2017.
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 32% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Athens County, with 15.6% in 2017.

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