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 2019, at 33.3%. Monroe County had the lowest, at 16.6%. The median was 22.8% and the figure for Indiana was 23.6%. Source: the U.S. Census Bureau.

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Highest33.3LaGrange County
Lowest16.6Monroe County
Median22.892 counties
Indiana23.6History

Map of counties, 2019

Adams County: 31.4 %Allen County: 25.7 %Bartholomew County: 24.1 %Benton County: 25.4 %Blackford County: 21.3 %Boone County: 26.5 %Brown County: 18.5 %Carroll County: 23.4 %Cass County: 24.3 %Clark County: 22.8 %Clay County: 22.6 %Clinton County: 25.9 %Crawford County: 21.4 %Daviess County: 29.1 %Dearborn County: 22.4 %Decatur County: 23.5 %DeKalb County: 24.3 %Delaware County: 19.4 %Dubois County: 23.6 %Elkhart County: 27.4 %Fayette County: 21.6 %Floyd County: 22.4 %Fountain County: 21.7 %Franklin County: 23.6 %Fulton County: 23.7 %Gibson County: 23.7 %Grant County: 20.7 %Greene County: 22 %Hamilton County: 27.4 %Hancock County: 23.8 %Harrison County: 22.8 %Hendricks County: 25.6 %Henry County: 20.2 %Howard County: 22.3 %Huntington County: 21.9 %Jackson County: 24.5 %Jasper County: 24 %Jay County: 25.5 %Jefferson County: 21.1 %Jennings County: 23.8 %Johnson County: 25.1 %Knox County: 22 %Kosciusko County: 23.7 %LaGrange County: 33.3 %Lake County: 23.8 %LaPorte County: 21.3 %Lawrence County: 21.3 %Madison County: 21.8 %Marion County: 24.2 %Marshall County: 25 %Martin County: 23.1 %Miami County: 21.6 %Monroe County: 16.6 %Montgomery County: 22.9 %Morgan County: 22.4 %Newton County: 21.5 %Noble County: 25.2 %Ohio County: 20.5 %Orange County: 23.2 %Owen County: 21.4 %Parke County: 23.1 %Perry County: 20.7 %Pike County: 22.3 %Porter County: 22.2 %Posey County: 22.8 %Pulaski County: 22.1 %Putnam County: 19.6 %Randolph County: 22.7 %Ripley County: 23.1 %Rush County: 22.9 %St. Joseph County: 23.1 %Scott County: 22.8 %Shelby County: 22.6 %Spencer County: 21.9 %Starke County: 22.3 %Steuben County: 20.2 %Sullivan County: 20.2 %Switzerland County: 25.3 %Tippecanoe County: 21.2 %Tipton County: 21.2 %Union County: 22.3 %Vanderburgh County: 21.7 %Vermillion County: 21.5 %Vigo County: 20.6 %Wabash County: 21.5 %Warren County: 22.5 %Warrick County: 24.3 %Washington County: 23.3 %Wayne County: 22.3 %Wells County: 24.1 %White County: 23 %Whitley County: 22.8 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2019. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2019

LaGrange County: 33.3 %LaGrange County33.3Adams County: 31.4 %Adams County31.4Daviess County: 29.1 %Daviess County29.1Hamilton County: 27.4 %Hamilton County27.4Elkhart County: 27.4 %Elkhart County27.4Boone County: 26.5 %Boone County26.5Clinton County: 25.9 %Clinton County25.9Allen County: 25.7 %Allen County25.7Hendricks County: 25.6 %Hendricks County25.6Jay County: 25.5 %Jay County25.5Benton County: 25.4 %Benton County25.4Switzerland County: 25.3 %Switzerland County25.3Noble County: 25.2 %Noble County25.2Johnson County: 25.1 %Johnson County25.1Marshall County: 25 %Marshall County25Jackson County: 24.5 %Jackson County24.5DeKalb County: 24.3 %DeKalb County24.3Cass County: 24.3 %Cass County24.3Warrick County: 24.3 %Warrick County24.3Marion County: 24.2 %Marion County24.2Wells County: 24.1 %Wells County24.1Bartholomew County: 24.1 %Bartholomew County24.1Jasper County: 24 %Jasper County24Hancock County: 23.8 %Hancock County23.8Jennings County: 23.8 %Jennings County23.8Lake County: 23.8 %Lake County23.8Kosciusko County: 23.7 %Kosciusko County23.7Fulton County: 23.7 %Fulton County23.7Gibson County: 23.7 %Gibson County23.7Dubois County: 23.6 %Dubois County23.6Franklin County: 23.6 %Franklin County23.6Decatur County: 23.5 %Decatur County23.5Carroll County: 23.4 %Carroll County23.4Washington County: 23.3 %Washington County23.3Orange County: 23.2 %Orange County23.2St. Joseph County: 23.1 %St. Joseph County23.1Ripley County: 23.1 %Ripley County23.1Parke County: 23.1 %Parke County23.1Martin County: 23.1 %Martin County23.1White County: 23 %White County23LaGrange County: 33.3 %LaGrange County33.3Adams County: 31.4 %Adams County31.4Daviess County: 29.1 %Daviess County29.1Hamilton County: 27.4 %Hamilton County27.4Elkhart County: 27.4 %Elkhart County27.4Boone County: 26.5 %Boone County26.5Clinton County: 25.9 %Clinton County25.9Allen County: 25.7 %Allen County25.7Hendricks County: 25.6 %Hendricks County25.6Jay County: 25.5 %Jay County25.5Benton County: 25.4 %Benton County25.4Switzerland County: 25.3 %Switzerland County25.3Noble County: 25.2 %Noble County25.2Johnson County: 25.1 %Johnson County25.1Marshall County: 25 %Marshall County25Jackson County: 24.5 %Jackson County24.5DeKalb County: 24.3 %DeKalb County24.3Cass County: 24.3 %Cass County24.3Warrick County: 24.3 %Warrick County24.3Marion County: 24.2 %Marion County24.2Wells County: 24.1 %Wells County24.1Bartholomew County: 24.1 %Bartholomew County24.1Jasper County: 24 %Jasper County24Hancock County: 23.8 %Hancock County23.8Jennings County: 23.8 %Jennings County23.8Lake County: 23.8 %Lake County23.8Kosciusko County: 23.7 %Kosciusko County23.7Fulton County: 23.7 %Fulton County23.7Gibson County: 23.7 %Gibson County23.7Dubois County: 23.6 %Dubois County23.6Franklin County: 23.6 %Franklin County23.6Decatur County: 23.5 %Decatur County23.5Carroll County: 23.4 %Carroll County23.4Washington County: 23.3 %Washington County23.3Orange County: 23.2 %Orange County23.2St. Joseph County: 23.1 %St. Joseph County23.1Ripley County: 23.1 %Ripley County23.1Parke County: 23.1 %Parke County23.1Martin County: 23.1 %Martin County23.1White County: 23 %White County23
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1LaGrange County33.3-0.1 pts
2Adams County31.4-0.1 pts
3Daviess County29.1-0 pts
4Hamilton County27.4-0.3 pts
5Elkhart County27.4-0.2 pts
6Boone County26.5-0.2 pts
7Clinton County25.9-0.2 pts
8Allen County25.7-0.1 pts
9Hendricks County25.6-0.3 pts
10Jay County25.5-0.4 pts
11Benton County25.4+0.3 pts
12Switzerland County25.30 pts
13Noble County25.2-0.1 pts
14Johnson County25.1-0.1 pts
15Marshall County25-0.2 pts
16Jackson County24.5-0.2 pts
17DeKalb County24.3-0.1 pts
18Cass County24.3-0.2 pts
19Warrick County24.3-0.3 pts
20Marion County24.2-0.1 pts
21Wells County24.1-0.1 pts
22Bartholomew County24.10 pts
23Jasper County240 pts
24Hancock County23.8-0.2 pts
25Jennings County23.8+0.2 pts
26Lake County23.8-0.1 pts
27Kosciusko County23.7-0.3 pts
28Fulton County23.70 pts
29Gibson County23.7-0.1 pts
30Dubois County23.6-0.2 pts
31Franklin County23.6-0.1 pts
32Decatur County23.5-0.5 pts
33Carroll County23.4-0.2 pts
34Washington County23.3+0.2 pts
35Orange County23.2-0.1 pts
36St. Joseph County23.1-0.2 pts
37Ripley County23.1-0.3 pts
38Parke County23.1+0.1 pts
39Martin County23.10 pts
40White County23-0.3 pts
41Montgomery County22.9-0.1 pts
42Rush County22.9-0 pts
43Clark County22.8-0.2 pts
44Harrison County22.8-0.2 pts
45Posey County22.8-0 pts
46Scott County22.8-0.1 pts
46Whitley County22.8-0.4 pts
48Randolph County22.7-0.2 pts
49Clay County22.6-0.1 pts
50Shelby County22.6-0.3 pts
51Warren County22.5-0.4 pts
52Floyd County22.4-0.1 pts
53Morgan County22.4-0.2 pts
54Dearborn County22.4-0.2 pts
55Pike County22.3+0.1 pts
56Starke County22.3-0.3 pts
57Union County22.3+0.8 pts
58Howard County22.3-0 pts
59Wayne County22.3-0 pts
60Porter County22.2-0.2 pts
61Pulaski County22.1-0.3 pts
62Knox County22-0.1 pts
63Greene County22-0.4 pts
64Huntington County21.9+0.1 pts
65Spencer County21.9-0.4 pts
66Madison County21.8-0.2 pts
67Fountain County21.7-0.2 pts
68Vanderburgh County21.7-0 pts
69Miami County21.6-0.1 pts
70Fayette County21.6-0.3 pts
71Wabash County21.5-0.1 pts
72Vermillion County21.50 pts
73Newton County21.5-0.1 pts
74Crawford County21.4-0.1 pts
75Owen County21.4-0.2 pts
76Lawrence County21.3-0.2 pts
77LaPorte County21.3-0.2 pts
78Blackford County21.3-0.2 pts
79Tippecanoe County21.2-0 pts
80Tipton County21.2-0 pts
81Jefferson County21.1-0 pts
82Grant County20.7-0.1 pts
83Perry County20.7-0.2 pts
84Vigo County20.6-0 pts
85Ohio County20.5-0.1 pts
86Henry County20.2-0.2 pts
87Sullivan County20.2-0.2 pts
88Steuben County20.2-0.1 pts
89Putnam County19.6-0.3 pts
90Delaware County19.4-0 pts
91Brown County18.5-0.4 pts
92Monroe County16.60 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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-counties?period=2019.
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 33.3% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 16.6% in 2019.

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