Data / Rankings / Population under 18 / Counties in Indiana

Counties in Indiana by population under 18

LaGrange County had the highest population under 18 of 92 counties in 2015, at 33.8%. Monroe County had the lowest, at 16.5%. The median was 23.2% and the figure for Indiana was 24%. Source: the U.S. Census Bureau.

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Highest33.8LaGrange County
Lowest16.5Monroe County
Median23.292 counties
Indiana24History

Map of counties, 2015

Adams County: 31.3 %Allen County: 26.2 %Bartholomew County: 24.1 %Benton County: 25.2 %Blackford County: 21.9 %Boone County: 27.3 %Brown County: 19.5 %Carroll County: 23.6 %Cass County: 24.6 %Clark County: 23.3 %Clay County: 22.9 %Clinton County: 26.2 %Crawford County: 21.8 %Daviess County: 28.8 %Dearborn County: 23.3 %Decatur County: 24.6 %DeKalb County: 24.8 %Delaware County: 19.7 %Dubois County: 24 %Elkhart County: 28 %Fayette County: 22.6 %Floyd County: 23.2 %Fountain County: 22.8 %Franklin County: 24.4 %Fulton County: 24.2 %Gibson County: 23.6 %Grant County: 20.8 %Greene County: 22.5 %Hamilton County: 28.8 %Hancock County: 24.2 %Harrison County: 23.1 %Hendricks County: 26.4 %Henry County: 20.9 %Howard County: 22.5 %Huntington County: 22.2 %Jackson County: 24.6 %Jasper County: 24.9 %Jay County: 26.2 %Jefferson County: 21.4 %Jennings County: 24.2 %Johnson County: 25.5 %Knox County: 21.6 %Kosciusko County: 24.6 %LaGrange County: 33.8 %Lake County: 24.4 %LaPorte County: 21.9 %Lawrence County: 22 %Madison County: 22.3 %Marion County: 24.6 %Marshall County: 25.6 %Martin County: 23.4 %Miami County: 22.1 %Monroe County: 16.5 %Montgomery County: 23.3 %Morgan County: 23.4 %Newton County: 22 %Noble County: 26.1 %Ohio County: 20.1 %Orange County: 23.4 %Owen County: 22.2 %Parke County: 22.4 %Perry County: 20.6 %Pike County: 22 %Porter County: 23 %Posey County: 23 %Pulaski County: 22.9 %Putnam County: 19.7 %Randolph County: 23.5 %Ripley County: 24.1 %Rush County: 23.2 %St. Joseph County: 23.7 %Scott County: 22.8 %Shelby County: 23.1 %Spencer County: 22.8 %Starke County: 22.8 %Steuben County: 20.7 %Sullivan County: 20.8 %Switzerland County: 25.6 %Tippecanoe County: 21.1 %Tipton County: 22 %Union County: 22.9 %Vanderburgh County: 22 %Vermillion County: 22.1 %Vigo County: 20.9 %Wabash County: 22 %Warren County: 22.3 %Warrick County: 25 %Washington County: 23.5 %Wayne County: 22.5 %Wells County: 24.1 %White County: 23.3 %Whitley County: 23.2 %
  • Under 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 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

LaGrange County: 33.8 %LaGrange County33.8Adams County: 31.3 %Adams County31.3Daviess County: 28.8 %Daviess County28.8Hamilton County: 28.8 %Hamilton County28.8Elkhart County: 28 %Elkhart County28Boone County: 27.3 %Boone County27.3Hendricks County: 26.4 %Hendricks County26.4Jay County: 26.2 %Jay County26.2Allen County: 26.2 %Allen County26.2Clinton County: 26.2 %Clinton County26.2Noble County: 26.1 %Noble County26.1Switzerland County: 25.6 %Switzerland County25.6Marshall County: 25.6 %Marshall County25.6Johnson County: 25.5 %Johnson County25.5Benton County: 25.2 %Benton County25.2Warrick County: 25 %Warrick County25Jasper County: 24.9 %Jasper County24.9DeKalb County: 24.8 %DeKalb County24.8Cass County: 24.6 %Cass County24.6Marion County: 24.6 %Marion County24.6Jackson County: 24.6 %Jackson County24.6Decatur County: 24.6 %Decatur County24.6Kosciusko County: 24.6 %Kosciusko County24.6Lake County: 24.4 %Lake County24.4Franklin County: 24.4 %Franklin County24.4Jennings County: 24.2 %Jennings County24.2Hancock County: 24.2 %Hancock County24.2Fulton County: 24.2 %Fulton County24.2Wells County: 24.1 %Wells County24.1Bartholomew County: 24.1 %Bartholomew County24.1Ripley County: 24.1 %Ripley County24.1Dubois County: 24 %Dubois County24St. Joseph County: 23.7 %St. Joseph County23.7Carroll County: 23.6 %Carroll County23.6Gibson County: 23.6 %Gibson County23.6Randolph County: 23.5 %Randolph County23.5Washington County: 23.5 %Washington County23.5Morgan County: 23.4 %Morgan County23.4Martin County: 23.4 %Martin County23.4Orange County: 23.4 %Orange County23.4LaGrange County: 33.8 %LaGrange County33.8Adams County: 31.3 %Adams County31.3Daviess County: 28.8 %Daviess County28.8Hamilton County: 28.8 %Hamilton County28.8Elkhart County: 28 %Elkhart County28Boone County: 27.3 %Boone County27.3Hendricks County: 26.4 %Hendricks County26.4Jay County: 26.2 %Jay County26.2Allen County: 26.2 %Allen County26.2Clinton County: 26.2 %Clinton County26.2Noble County: 26.1 %Noble County26.1Switzerland County: 25.6 %Switzerland County25.6Marshall County: 25.6 %Marshall County25.6Johnson County: 25.5 %Johnson County25.5Benton County: 25.2 %Benton County25.2Warrick County: 25 %Warrick County25Jasper County: 24.9 %Jasper County24.9DeKalb County: 24.8 %DeKalb County24.8Cass County: 24.6 %Cass County24.6Marion County: 24.6 %Marion County24.6Jackson County: 24.6 %Jackson County24.6Decatur County: 24.6 %Decatur County24.6Kosciusko County: 24.6 %Kosciusko County24.6Lake County: 24.4 %Lake County24.4Franklin County: 24.4 %Franklin County24.4Jennings County: 24.2 %Jennings County24.2Hancock County: 24.2 %Hancock County24.2Fulton County: 24.2 %Fulton County24.2Wells County: 24.1 %Wells County24.1Bartholomew County: 24.1 %Bartholomew County24.1Ripley County: 24.1 %Ripley County24.1Dubois County: 24 %Dubois County24St. Joseph County: 23.7 %St. Joseph County23.7Carroll County: 23.6 %Carroll County23.6Gibson County: 23.6 %Gibson County23.6Randolph County: 23.5 %Randolph County23.5Washington County: 23.5 %Washington County23.5Morgan County: 23.4 %Morgan County23.4Martin County: 23.4 %Martin County23.4Orange County: 23.4 %Orange County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1LaGrange County33.8-0.1 pts
2Adams County31.30 pts
3Daviess County28.8-0.1 pts
4Hamilton County28.8-0.3 pts
5Elkhart County28+0.1 pts
6Boone County27.3-0 pts
7Hendricks County26.4-0.1 pts
8Jay County26.20 pts
9Allen County26.2-0.1 pts
10Clinton County26.2-0 pts
11Noble County26.1-0 pts
12Switzerland County25.6+0.2 pts
13Marshall County25.6-0.1 pts
14Johnson County25.5-0.2 pts
15Benton County25.2-0.2 pts
16Warrick County25-0 pts
17Jasper County24.9+0.1 pts
18DeKalb County24.8-0.2 pts
19Cass County24.6-0.1 pts
20Marion County24.6-0 pts
21Jackson County24.6+0.3 pts
22Decatur County24.6-0.4 pts
22Kosciusko County24.6-0.2 pts
24Lake County24.4-0.2 pts
25Franklin County24.4-0.4 pts
26Jennings County24.2-0.2 pts
27Hancock County24.2-0.3 pts
28Fulton County24.20 pts
29Wells County24.1+0.1 pts
30Bartholomew County24.1-0.3 pts
31Ripley County24.1-0.3 pts
32Dubois County24-0.2 pts
33St. Joseph County23.7-0.2 pts
34Carroll County23.6-0.3 pts
35Gibson County23.6+0.1 pts
36Randolph County23.5-0.1 pts
37Washington County23.5-0.4 pts
38Morgan County23.4-0.2 pts
39Martin County23.4-0.1 pts
40Orange County23.4-0.3 pts
41Dearborn County23.3-0.3 pts
42Clark County23.3-0 pts
43White County23.3-0.1 pts
44Montgomery County23.3-0.1 pts
45Floyd County23.2-0.1 pts
46Whitley County23.2-0.2 pts
47Rush County23.2-0.1 pts
48Shelby County23.1-0.2 pts
49Harrison County23.1+0.2 pts
50Posey County23-0.1 pts
51Porter County23-0.1 pts
52Pulaski County22.9-0.2 pts
53Clay County22.9-0 pts
54Union County22.9-0.5 pts
55Scott County22.8-0.3 pts
56Spencer County22.8-0.1 pts
57Fountain County22.8-0.1 pts
57Starke County22.8-0.1 pts
59Fayette County22.6-0 pts
60Wayne County22.5+0.1 pts
61Howard County22.5-0.2 pts
62Greene County22.5-0.3 pts
63Parke County22.4+0.3 pts
64Warren County22.3-0.4 pts
65Madison County22.3-0 pts
66Owen County22.2+0.2 pts
67Huntington County22.2-0.2 pts
68Vermillion County22.1-0.1 pts
69Miami County22.1+0.2 pts
70Tipton County22-0.1 pts
71Pike County22-0.2 pts
72Wabash County22-0.2 pts
73Newton County22-0.2 pts
74Lawrence County22-0.2 pts
75Vanderburgh County220 pts
76LaPorte County21.9-0.1 pts
77Blackford County21.9-0 pts
78Crawford County21.8-0.3 pts
79Knox County21.6+0.1 pts
80Jefferson County21.4-0.2 pts
81Tippecanoe County21.1+0.1 pts
82Henry County20.9-0.1 pts
83Vigo County20.9-0.1 pts
84Sullivan County20.8-0.1 pts
85Grant County20.8-0.1 pts
86Steuben County20.7-0.6 pts
87Perry County20.6+0.2 pts
88Ohio County20.1-0.6 pts
89Delaware County19.7-0 pts
90Putnam County19.7-0.1 pts
91Brown County19.5-0.1 pts
92Monroe County16.5+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 Indiana 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 Indiana 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/indiana-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 Indiana 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/indiana-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 Indiana 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/indiana-counties?period=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_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 Indiana 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/indiana-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 Indiana 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/indiana-counties?period=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-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 Indiana by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

LaGrange County, with 33.8% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 16.5% 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 Indiana: more rankings