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 2015, at 32.9%. Athens County had the lowest, at 15.8%. The median was 23.1% and the figure for Ohio was 22.6%. Source: the U.S. Census Bureau.

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Highest32.9Holmes County
Lowest15.8Athens County
Median23.188 counties
Ohio22.6History

Map of counties, 2015

Adams County: 24.3 %Allen County: 23.5 %Ashland County: 23.3 %Ashtabula County: 22.4 %Athens County: 15.8 %Auglaize County: 24.3 %Belmont County: 19.3 %Brown County: 23.3 %Butler County: 24.1 %Carroll County: 21.3 %Champaign County: 23.2 %Clark County: 22.8 %Clermont County: 24.1 %Clinton County: 23.4 %Columbiana County: 20.9 %Coshocton County: 23.8 %Crawford County: 21.8 %Cuyahoga County: 21.2 %Darke County: 24.2 %Defiance County: 23.6 %Delaware County: 27.9 %Erie County: 20.7 %Fairfield County: 24.5 %Fayette County: 23.9 %Franklin County: 23.4 %Fulton County: 24.3 %Gallia County: 23 %Geauga County: 23.7 %Greene County: 21 %Guernsey County: 22.4 %Hamilton County: 23 %Hancock County: 22.7 %Hardin County: 23.1 %Harrison County: 21.6 %Henry County: 23.8 %Highland County: 24.5 %Hocking County: 22.9 %Holmes County: 32.9 %Huron County: 24.4 %Jackson County: 24.1 %Jefferson County: 19.7 %Knox County: 23.2 %Lake County: 20.7 %Lawrence County: 22.4 %Licking County: 23.6 %Logan County: 23.5 %Lorain County: 22.6 %Lucas County: 23 %Madison County: 21.2 %Mahoning County: 20.3 %Marion County: 21 %Medina County: 23.3 %Meigs County: 22 %Mercer County: 25.5 %Miami County: 23.4 %Monroe County: 21.2 %Montgomery County: 22.3 %Morgan County: 21.7 %Morrow County: 24.4 %Muskingum County: 23.2 %Noble County: 18.6 %Ottawa County: 19.4 %Paulding County: 24 %Perry County: 24.4 %Pickaway County: 22.7 %Pike County: 23.9 %Portage County: 19.4 %Preble County: 23.2 %Putnam County: 25.5 %Richland County: 21.7 %Ross County: 21.7 %Sandusky County: 23.1 %Scioto County: 22 %Seneca County: 22.5 %Shelby County: 25.8 %Stark County: 21.9 %Summit County: 21.5 %Trumbull County: 20.7 %Tuscarawas County: 22.9 %Union County: 26 %Van Wert County: 23.6 %Vinton County: 22.9 %Warren County: 26.1 %Washington County: 20.1 %Wayne County: 24.5 %Williams County: 23 %Wood County: 20.9 %Wyandot County: 23.4 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2015. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2015

Holmes County: 32.9 %Holmes County32.9Delaware County: 27.9 %Delaware County27.9Warren County: 26.1 %Warren County26.1Union County: 26 %Union County26Shelby County: 25.8 %Shelby County25.8Putnam County: 25.5 %Putnam County25.5Mercer County: 25.5 %Mercer County25.5Fairfield County: 24.5 %Fairfield County24.5Wayne County: 24.5 %Wayne County24.5Highland County: 24.5 %Highland County24.5Morrow County: 24.4 %Morrow County24.4Perry County: 24.4 %Perry County24.4Huron County: 24.4 %Huron County24.4Adams County: 24.3 %Adams County24.3Auglaize County: 24.3 %Auglaize County24.3Fulton County: 24.3 %Fulton County24.3Darke County: 24.2 %Darke County24.2Butler County: 24.1 %Butler County24.1Jackson County: 24.1 %Jackson County24.1Clermont County: 24.1 %Clermont County24.1Paulding County: 24 %Paulding County24Pike County: 23.9 %Pike County23.9Fayette County: 23.9 %Fayette County23.9Henry County: 23.8 %Henry County23.8Coshocton County: 23.8 %Coshocton County23.8Geauga County: 23.7 %Geauga County23.7Van Wert County: 23.6 %Van Wert County23.6Defiance County: 23.6 %Defiance County23.6Licking County: 23.6 %Licking County23.6Allen County: 23.5 %Allen County23.5Logan County: 23.5 %Logan County23.5Clinton County: 23.4 %Clinton County23.4Franklin County: 23.4 %Franklin County23.4Miami County: 23.4 %Miami County23.4Wyandot County: 23.4 %Wyandot County23.4Medina County: 23.3 %Medina County23.3Brown County: 23.3 %Brown County23.3Ashland County: 23.3 %Ashland County23.3Knox County: 23.2 %Knox County23.2Muskingum County: 23.2 %Muskingum County23.2Holmes County: 32.9 %Holmes County32.9Delaware County: 27.9 %Delaware County27.9Warren County: 26.1 %Warren County26.1Union County: 26 %Union County26Shelby County: 25.8 %Shelby County25.8Putnam County: 25.5 %Putnam County25.5Mercer County: 25.5 %Mercer County25.5Fairfield County: 24.5 %Fairfield County24.5Wayne County: 24.5 %Wayne County24.5Highland County: 24.5 %Highland County24.5Morrow County: 24.4 %Morrow County24.4Perry County: 24.4 %Perry County24.4Huron County: 24.4 %Huron County24.4Adams County: 24.3 %Adams County24.3Auglaize County: 24.3 %Auglaize County24.3Fulton County: 24.3 %Fulton County24.3Darke County: 24.2 %Darke County24.2Butler County: 24.1 %Butler County24.1Jackson County: 24.1 %Jackson County24.1Clermont County: 24.1 %Clermont County24.1Paulding County: 24 %Paulding County24Pike County: 23.9 %Pike County23.9Fayette County: 23.9 %Fayette County23.9Henry County: 23.8 %Henry County23.8Coshocton County: 23.8 %Coshocton County23.8Geauga County: 23.7 %Geauga County23.7Van Wert County: 23.6 %Van Wert County23.6Defiance County: 23.6 %Defiance County23.6Licking County: 23.6 %Licking County23.6Allen County: 23.5 %Allen County23.5Logan County: 23.5 %Logan County23.5Clinton County: 23.4 %Clinton County23.4Franklin County: 23.4 %Franklin County23.4Miami County: 23.4 %Miami County23.4Wyandot County: 23.4 %Wyandot County23.4Medina County: 23.3 %Medina County23.3Brown County: 23.3 %Brown County23.3Ashland County: 23.3 %Ashland County23.3Knox County: 23.2 %Knox County23.2Muskingum County: 23.2 %Muskingum County23.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1Holmes County32.9-0.4 pts
2Delaware County27.9-0.2 pts
3Warren County26.1-0.2 pts
4Union County26-0.2 pts
5Shelby County25.8-0.1 pts
6Putnam County25.5-0.1 pts
7Mercer County25.5-0 pts
8Fairfield County24.5-0.2 pts
9Wayne County24.5-0.1 pts
10Highland County24.5-0 pts
11Morrow County24.4-0 pts
12Perry County24.4-0.1 pts
13Huron County24.4-0.3 pts
14Adams County24.3-0.1 pts
15Auglaize County24.30 pts
16Fulton County24.3-0.2 pts
17Darke County24.2-0.1 pts
18Butler County24.1-0.2 pts
19Jackson County24.1-0.2 pts
20Clermont County24.1-0.3 pts
21Paulding County24-0.2 pts
22Pike County23.9-0.1 pts
23Fayette County23.9-0 pts
24Henry County23.8-0.3 pts
25Coshocton County23.8-0 pts
26Geauga County23.7-0.4 pts
27Van Wert County23.6-0.3 pts
28Defiance County23.6-0.2 pts
29Licking County23.6-0.1 pts
30Allen County23.5-0 pts
31Logan County23.5-0.4 pts
32Clinton County23.4-0.3 pts
33Franklin County23.4-0.1 pts
34Miami County23.4-0.1 pts
35Wyandot County23.4-0.1 pts
36Medina County23.3-0.3 pts
37Brown County23.3-0.2 pts
38Ashland County23.3-0.2 pts
39Knox County23.2-0 pts
40Muskingum County23.2-0.1 pts
41Preble County23.2-0.3 pts
42Champaign County23.2-0.3 pts
43Sandusky County23.1-0.2 pts
44Hardin County23.1-0.2 pts
45Hamilton County23-0 pts
46Gallia County23-0.2 pts
47Williams County23-0.1 pts
48Lucas County23-0 pts
49Tuscarawas County22.90 pts
50Vinton County22.9-0.4 pts
51Hocking County22.9-0.4 pts
52Clark County22.8-0.1 pts
53Pickaway County22.7+0.1 pts
54Hancock County22.7-0.1 pts
55Lorain County22.6-0.2 pts
56Seneca County22.5-0 pts
57Lawrence County22.4-0.2 pts
58Guernsey County22.4-0.3 pts
59Ashtabula County22.4-0.1 pts
60Montgomery County22.3-0.1 pts
61Meigs County22-0.2 pts
62Scioto County22-0.1 pts
63Stark County21.9-0.2 pts
64Crawford County21.8-0 pts
65Morgan County21.7-0.3 pts
66Richland County21.7-0 pts
67Ross County21.7-0.1 pts
68Harrison County21.6-0 pts
69Summit County21.5-0.2 pts
70Carroll County21.3-0.3 pts
71Madison County21.2-0.3 pts
72Cuyahoga County21.2-0.2 pts
73Monroe County21.2+0.1 pts
74Greene County21+0.1 pts
75Marion County21-0 pts
76Wood County20.90 pts
77Columbiana County20.9-0 pts
78Trumbull County20.7-0.2 pts
79Lake County20.7-0.2 pts
80Erie County20.7-0.2 pts
81Mahoning County20.3-0.1 pts
82Washington County20.1-0.1 pts
83Jefferson County19.70 pts
84Ottawa County19.4-0.2 pts
85Portage County19.4-0.2 pts
86Belmont County19.3-0.1 pts
87Noble County18.6+0.2 pts
88Athens County15.8-0.3 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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_ohio_by_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/ohio-counties?period=2015.
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 32.9% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Athens County, with 15.8% in 2015.

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