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 2021, at 32.7%. Monroe County had the lowest, at 15.9%. The median was 22.5% and the figure for Indiana was 23.3%. Source: the U.S. Census Bureau.

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Highest32.7LaGrange County
Lowest15.9Monroe County
Median22.592 counties
Indiana23.3History

Map of counties, 2021

Adams County: 31.5 %Allen County: 25.4 %Bartholomew County: 24.1 %Benton County: 24.2 %Blackford County: 21.2 %Boone County: 25.8 %Brown County: 17.9 %Carroll County: 23.1 %Cass County: 24.1 %Clark County: 22.5 %Clay County: 22.8 %Clinton County: 25.8 %Crawford County: 21.2 %Daviess County: 29.1 %Dearborn County: 22.2 %Decatur County: 23.3 %DeKalb County: 24.3 %Delaware County: 19.3 %Dubois County: 23.4 %Elkhart County: 27.2 %Fayette County: 21.7 %Floyd County: 22.5 %Fountain County: 21.8 %Franklin County: 23.2 %Fulton County: 23.5 %Gibson County: 24 %Grant County: 21 %Greene County: 22.1 %Hamilton County: 26.2 %Hancock County: 23.6 %Harrison County: 22.5 %Hendricks County: 24.8 %Henry County: 20 %Howard County: 22.3 %Huntington County: 22 %Jackson County: 24.6 %Jasper County: 23.5 %Jay County: 25.5 %Jefferson County: 21 %Jennings County: 23.5 %Johnson County: 24.7 %Knox County: 22.1 %Kosciusko County: 23.4 %LaGrange County: 32.7 %Lake County: 23.3 %LaPorte County: 21.2 %Lawrence County: 21.3 %Madison County: 21.5 %Marion County: 24.3 %Marshall County: 24.8 %Martin County: 22.5 %Miami County: 21.8 %Monroe County: 15.9 %Montgomery County: 22.8 %Morgan County: 22.2 %Newton County: 21.2 %Noble County: 24.8 %Ohio County: 20.4 %Orange County: 23.1 %Owen County: 20.7 %Parke County: 23.8 %Perry County: 20.7 %Pike County: 22.3 %Porter County: 21.7 %Posey County: 22.6 %Pulaski County: 21.8 %Putnam County: 19.5 %Randolph County: 22.6 %Ripley County: 23.2 %Rush County: 22.5 %St. Joseph County: 23.1 %Scott County: 22.2 %Shelby County: 22.4 %Spencer County: 22 %Starke County: 22.2 %Steuben County: 20 %Sullivan County: 20 %Switzerland County: 24.6 %Tippecanoe County: 20.9 %Tipton County: 21.5 %Union County: 22.1 %Vanderburgh County: 21.7 %Vermillion County: 21.5 %Vigo County: 20.4 %Wabash County: 21.3 %Warren County: 22.4 %Warrick County: 23.8 %Washington County: 22.7 %Wayne County: 22.6 %Wells County: 24.3 %White County: 22.7 %Whitley County: 22.7 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

LaGrange County: 32.7 %LaGrange County32.7Adams County: 31.5 %Adams County31.5Daviess County: 29.1 %Daviess County29.1Elkhart County: 27.2 %Elkhart County27.2Hamilton County: 26.2 %Hamilton County26.2Boone County: 25.8 %Boone County25.8Clinton County: 25.8 %Clinton County25.8Jay County: 25.5 %Jay County25.5Allen County: 25.4 %Allen County25.4Hendricks County: 24.8 %Hendricks County24.8Noble County: 24.8 %Noble County24.8Marshall County: 24.8 %Marshall County24.8Johnson County: 24.7 %Johnson County24.7Switzerland County: 24.6 %Switzerland County24.6Jackson County: 24.6 %Jackson County24.6Wells County: 24.3 %Wells County24.3DeKalb County: 24.3 %DeKalb County24.3Marion County: 24.3 %Marion County24.3Benton County: 24.2 %Benton County24.2Bartholomew County: 24.1 %Bartholomew County24.1Cass County: 24.1 %Cass County24.1Gibson County: 24 %Gibson County24Warrick County: 23.8 %Warrick County23.8Parke County: 23.8 %Parke County23.8Hancock County: 23.6 %Hancock County23.6Jennings County: 23.5 %Jennings County23.5Fulton County: 23.5 %Fulton County23.5Jasper County: 23.5 %Jasper County23.5Kosciusko County: 23.4 %Kosciusko County23.4Dubois County: 23.4 %Dubois County23.4Lake County: 23.3 %Lake County23.3Decatur County: 23.3 %Decatur County23.3Franklin County: 23.2 %Franklin County23.2Ripley County: 23.2 %Ripley County23.2Orange County: 23.1 %Orange County23.1Carroll County: 23.1 %Carroll County23.1St. Joseph County: 23.1 %St. Joseph County23.1Montgomery County: 22.8 %Montgomery County22.8Clay County: 22.8 %Clay County22.8Whitley County: 22.7 %Whitley County22.7LaGrange County: 32.7 %LaGrange County32.7Adams County: 31.5 %Adams County31.5Daviess County: 29.1 %Daviess County29.1Elkhart County: 27.2 %Elkhart County27.2Hamilton County: 26.2 %Hamilton County26.2Boone County: 25.8 %Boone County25.8Clinton County: 25.8 %Clinton County25.8Jay County: 25.5 %Jay County25.5Allen County: 25.4 %Allen County25.4Hendricks County: 24.8 %Hendricks County24.8Noble County: 24.8 %Noble County24.8Marshall County: 24.8 %Marshall County24.8Johnson County: 24.7 %Johnson County24.7Switzerland County: 24.6 %Switzerland County24.6Jackson County: 24.6 %Jackson County24.6Wells County: 24.3 %Wells County24.3DeKalb County: 24.3 %DeKalb County24.3Marion County: 24.3 %Marion County24.3Benton County: 24.2 %Benton County24.2Bartholomew County: 24.1 %Bartholomew County24.1Cass County: 24.1 %Cass County24.1Gibson County: 24 %Gibson County24Warrick County: 23.8 %Warrick County23.8Parke County: 23.8 %Parke County23.8Hancock County: 23.6 %Hancock County23.6Jennings County: 23.5 %Jennings County23.5Fulton County: 23.5 %Fulton County23.5Jasper County: 23.5 %Jasper County23.5Kosciusko County: 23.4 %Kosciusko County23.4Dubois County: 23.4 %Dubois County23.4Lake County: 23.3 %Lake County23.3Decatur County: 23.3 %Decatur County23.3Franklin County: 23.2 %Franklin County23.2Ripley County: 23.2 %Ripley County23.2Orange County: 23.1 %Orange County23.1Carroll County: 23.1 %Carroll County23.1St. Joseph County: 23.1 %St. Joseph County23.1Montgomery County: 22.8 %Montgomery County22.8Clay County: 22.8 %Clay County22.8Whitley County: 22.7 %Whitley County22.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1LaGrange County32.7-0.3 pts
2Adams County31.50 pts
3Daviess County29.1+0.1 pts
4Elkhart County27.2-0.2 pts
5Hamilton County26.2-0.6 pts
6Boone County25.8-0.4 pts
7Clinton County25.8-0.2 pts
8Jay County25.5-0.2 pts
9Allen County25.4-0.1 pts
10Hendricks County24.8-0.3 pts
11Noble County24.8-0.2 pts
12Marshall County24.8-0 pts
13Johnson County24.7-0.2 pts
14Switzerland County24.6+0.1 pts
15Jackson County24.6-0.1 pts
16Wells County24.3+0.1 pts
17DeKalb County24.3-0.1 pts
18Marion County24.3-0.1 pts
19Benton County24.2-0.7 pts
20Bartholomew County24.1-0.1 pts
21Cass County24.1+0.1 pts
22Gibson County24-0.1 pts
23Warrick County23.8-0.1 pts
24Parke County23.8+0.4 pts
25Hancock County23.6-0.1 pts
26Jennings County23.5-0.1 pts
27Fulton County23.5-0.3 pts
28Jasper County23.5-0.3 pts
29Kosciusko County23.4-0.1 pts
30Dubois County23.4-0.1 pts
31Lake County23.3-0.2 pts
32Decatur County23.3-0.2 pts
33Franklin County23.2-0.2 pts
34Ripley County23.2-0.2 pts
35Orange County23.1-0.2 pts
36Carroll County23.10 pts
37St. Joseph County23.1-0.1 pts
38Montgomery County22.8-0.2 pts
39Clay County22.8-0.1 pts
40Whitley County22.7-0.2 pts
41White County22.7-0.4 pts
42Washington County22.7-0.2 pts
43Wayne County22.60 pts
44Randolph County22.6+0.1 pts
45Posey County22.6-0.1 pts
46Martin County22.5-0 pts
47Clark County22.5-0.2 pts
48Harrison County22.5-0.2 pts
49Rush County22.5-0.3 pts
50Floyd County22.5-0 pts
51Shelby County22.4-0.3 pts
52Warren County22.4-0 pts
53Howard County22.30 pts
54Pike County22.3-0.3 pts
55Scott County22.2-0.1 pts
56Morgan County22.2-0.2 pts
57Starke County22.2-0 pts
58Dearborn County22.2-0.2 pts
59Greene County22.1-0.2 pts
60Union County22.1-0 pts
61Knox County22.10 pts
62Huntington County22-0 pts
63Spencer County22+0.1 pts
64Miami County21.8+0.5 pts
65Pulaski County21.8-0.1 pts
66Fountain County21.8-0.2 pts
67Porter County21.7-0.3 pts
68Fayette County21.7-0 pts
68Vanderburgh County21.7-0.1 pts
70Vermillion County21.5-0.1 pts
71Tipton County21.5-0 pts
72Madison County21.5-0.2 pts
73Wabash County21.3-0.1 pts
74Lawrence County21.3-0.2 pts
75Blackford County21.2-0.1 pts
76Newton County21.2-0.3 pts
77LaPorte County21.2-0.2 pts
78Crawford County21.2-0.4 pts
79Jefferson County210 pts
80Grant County210 pts
81Tippecanoe County20.9-0.1 pts
82Owen County20.7-0.3 pts
83Perry County20.7-0.3 pts
84Vigo County20.4-0 pts
85Ohio County20.4+0.3 pts
86Henry County20-0.1 pts
87Steuben County20-0.3 pts
88Sullivan County20-0.2 pts
89Putnam County19.5-0.1 pts
90Delaware County19.3-0 pts
91Brown County17.90 pts
92Monroe County15.9-0.6 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, 2021) [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, 2021. 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=2021. 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, 2021. 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=2021.

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, 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2021,
  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, 2021}},
  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=2021. 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, 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-counties?period=2021.
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 32.7% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 15.9% in 2021.

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