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 2024, at 31.9%. Monroe County had the lowest, at 15.4%. The median was 22.1% and the figure for Indiana was 22.8%. Source: the U.S. Census Bureau.

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Highest31.9LaGrange County
Lowest15.4Monroe County
Median22.192 counties
Indiana22.8History

Map of counties, 2024

Adams County: 31.2 %Allen County: 24.9 %Bartholomew County: 23.2 %Benton County: 24.1 %Blackford County: 21.5 %Boone County: 24.8 %Brown County: 16.6 %Carroll County: 22 %Cass County: 24.1 %Clark County: 21.8 %Clay County: 22.1 %Clinton County: 25.3 %Crawford County: 20.8 %Daviess County: 29.6 %Dearborn County: 21.5 %Decatur County: 22.7 %DeKalb County: 23.7 %Delaware County: 19 %Dubois County: 23.1 %Elkhart County: 26.3 %Fayette County: 21.9 %Floyd County: 22 %Fountain County: 22.7 %Franklin County: 22.2 %Fulton County: 22.6 %Gibson County: 22.9 %Grant County: 21 %Greene County: 21.7 %Hamilton County: 24.7 %Hancock County: 23.2 %Harrison County: 22 %Hendricks County: 24.4 %Henry County: 19.7 %Howard County: 22.1 %Huntington County: 21.6 %Jackson County: 24.8 %Jasper County: 23 %Jay County: 25.8 %Jefferson County: 20.5 %Jennings County: 23.2 %Johnson County: 24.1 %Knox County: 21.7 %Kosciusko County: 22.7 %LaGrange County: 31.9 %Lake County: 22.6 %LaPorte County: 20.7 %Lawrence County: 20.8 %Madison County: 21.2 %Marion County: 24.1 %Marshall County: 23.9 %Martin County: 22.6 %Miami County: 21.4 %Monroe County: 15.4 %Montgomery County: 22.6 %Morgan County: 21.5 %Newton County: 21 %Noble County: 24.5 %Ohio County: 19.4 %Orange County: 22.9 %Owen County: 20 %Parke County: 23.8 %Perry County: 19.6 %Pike County: 22 %Porter County: 20.7 %Posey County: 21.5 %Pulaski County: 21.8 %Putnam County: 19.5 %Randolph County: 22.5 %Ripley County: 23.1 %Rush County: 22.1 %St. Joseph County: 22.7 %Scott County: 22 %Shelby County: 22.1 %Spencer County: 21.6 %Starke County: 21.8 %Steuben County: 19.6 %Sullivan County: 19.8 %Switzerland County: 24 %Tippecanoe County: 20.2 %Tipton County: 20.7 %Union County: 21.2 %Vanderburgh County: 21.4 %Vermillion County: 21.1 %Vigo County: 20.2 %Wabash County: 20.9 %Warren County: 21.5 %Warrick County: 23 %Washington County: 22.4 %Wayne County: 22.3 %Wells County: 23.9 %White County: 23.1 %Whitley County: 22.5 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

LaGrange County: 31.9 %LaGrange County31.9Adams County: 31.2 %Adams County31.2Daviess County: 29.6 %Daviess County29.6Elkhart County: 26.3 %Elkhart County26.3Jay County: 25.8 %Jay County25.8Clinton County: 25.3 %Clinton County25.3Allen County: 24.9 %Allen County24.9Jackson County: 24.8 %Jackson County24.8Boone County: 24.8 %Boone County24.8Hamilton County: 24.7 %Hamilton County24.7Noble County: 24.5 %Noble County24.5Hendricks County: 24.4 %Hendricks County24.4Johnson County: 24.1 %Johnson County24.1Marion County: 24.1 %Marion County24.1Benton County: 24.1 %Benton County24.1Cass County: 24.1 %Cass County24.1Switzerland County: 24 %Switzerland County24Wells County: 23.9 %Wells County23.9Marshall County: 23.9 %Marshall County23.9Parke County: 23.8 %Parke County23.8DeKalb County: 23.7 %DeKalb County23.7Jennings County: 23.2 %Jennings County23.2Hancock County: 23.2 %Hancock County23.2Bartholomew County: 23.2 %Bartholomew County23.2Ripley County: 23.1 %Ripley County23.1Dubois County: 23.1 %Dubois County23.1White County: 23.1 %White County23.1Jasper County: 23 %Jasper County23Warrick County: 23 %Warrick County23Gibson County: 22.9 %Gibson County22.9Orange County: 22.9 %Orange County22.9Kosciusko County: 22.7 %Kosciusko County22.7St. Joseph County: 22.7 %St. Joseph County22.7Decatur County: 22.7 %Decatur County22.7Fountain County: 22.7 %Fountain County22.7Lake County: 22.6 %Lake County22.6Montgomery County: 22.6 %Montgomery County22.6Fulton County: 22.6 %Fulton County22.6Martin County: 22.6 %Martin County22.6Whitley County: 22.5 %Whitley County22.5LaGrange County: 31.9 %LaGrange County31.9Adams County: 31.2 %Adams County31.2Daviess County: 29.6 %Daviess County29.6Elkhart County: 26.3 %Elkhart County26.3Jay County: 25.8 %Jay County25.8Clinton County: 25.3 %Clinton County25.3Allen County: 24.9 %Allen County24.9Jackson County: 24.8 %Jackson County24.8Boone County: 24.8 %Boone County24.8Hamilton County: 24.7 %Hamilton County24.7Noble County: 24.5 %Noble County24.5Hendricks County: 24.4 %Hendricks County24.4Johnson County: 24.1 %Johnson County24.1Marion County: 24.1 %Marion County24.1Benton County: 24.1 %Benton County24.1Cass County: 24.1 %Cass County24.1Switzerland County: 24 %Switzerland County24Wells County: 23.9 %Wells County23.9Marshall County: 23.9 %Marshall County23.9Parke County: 23.8 %Parke County23.8DeKalb County: 23.7 %DeKalb County23.7Jennings County: 23.2 %Jennings County23.2Hancock County: 23.2 %Hancock County23.2Bartholomew County: 23.2 %Bartholomew County23.2Ripley County: 23.1 %Ripley County23.1Dubois County: 23.1 %Dubois County23.1White County: 23.1 %White County23.1Jasper County: 23 %Jasper County23Warrick County: 23 %Warrick County23Gibson County: 22.9 %Gibson County22.9Orange County: 22.9 %Orange County22.9Kosciusko County: 22.7 %Kosciusko County22.7St. Joseph County: 22.7 %St. Joseph County22.7Decatur County: 22.7 %Decatur County22.7Fountain County: 22.7 %Fountain County22.7Lake County: 22.6 %Lake County22.6Montgomery County: 22.6 %Montgomery County22.6Fulton County: 22.6 %Fulton County22.6Martin County: 22.6 %Martin County22.6Whitley County: 22.5 %Whitley County22.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1LaGrange County31.9-0.4 pts
2Adams County31.2-0.3 pts
3Daviess County29.6+0.1 pts
4Elkhart County26.3-0.3 pts
5Jay County25.8+0.3 pts
6Clinton County25.3-0.4 pts
7Allen County24.9-0.2 pts
8Jackson County24.8+0.1 pts
9Boone County24.8-0.6 pts
10Hamilton County24.7-0.6 pts
11Noble County24.50 pts
12Hendricks County24.4-0.3 pts
13Johnson County24.1-0.3 pts
14Marion County24.1-0.1 pts
15Benton County24.1-0.1 pts
16Cass County24.1-0.3 pts
17Switzerland County24-0.4 pts
18Wells County23.9-0.3 pts
19Marshall County23.9-0.2 pts
20Parke County23.8-0.6 pts
21DeKalb County23.7-0.3 pts
22Jennings County23.2-0.1 pts
23Hancock County23.2-0.1 pts
24Bartholomew County23.2-0.3 pts
25Ripley County23.1-0.3 pts
26Dubois County23.1-0.2 pts
27White County23.10 pts
28Jasper County23-0 pts
29Warrick County23-0.3 pts
30Gibson County22.9-0.4 pts
31Orange County22.9-0.2 pts
32Kosciusko County22.7-0.3 pts
33St. Joseph County22.7-0.2 pts
34Decatur County22.7-0.2 pts
35Fountain County22.7+0.5 pts
36Lake County22.6-0.3 pts
37Montgomery County22.6-0.2 pts
38Fulton County22.6-0.5 pts
39Martin County22.60 pts
40Whitley County22.5-0.1 pts
41Randolph County22.5+0.1 pts
42Washington County22.4-0.1 pts
43Wayne County22.3-0.2 pts
44Franklin County22.2-0.6 pts
45Shelby County22.10 pts
46Clay County22.1-0.3 pts
47Howard County22.1-0.1 pts
48Rush County22.1-0.3 pts
49Harrison County22-0.4 pts
50Scott County22-0.3 pts
51Carroll County22-0.5 pts
52Pike County22-0.1 pts
53Floyd County22-0.1 pts
54Fayette County21.9+0.1 pts
55Clark County21.8-0.3 pts
56Pulaski County21.80 pts
57Starke County21.8+0.1 pts
58Greene County21.7-0.2 pts
59Knox County21.7-0.1 pts
60Spencer County21.6-0.1 pts
61Huntington County21.6-0 pts
62Dearborn County21.5-0.3 pts
63Blackford County21.5+0.1 pts
64Morgan County21.5-0.2 pts
65Warren County21.5-0.4 pts
66Posey County21.5-0.5 pts
67Miami County21.4-0.2 pts
68Vanderburgh County21.4-0.1 pts
69Union County21.2-0.5 pts
70Madison County21.2-0.2 pts
71Vermillion County21.1+0.1 pts
72Newton County21-0.1 pts
73Grant County21-0.1 pts
74Wabash County20.9-0.2 pts
75Lawrence County20.8-0.2 pts
76Crawford County20.8+0.5 pts
77Porter County20.7-0.3 pts
77Tipton County20.7-0.1 pts
79LaPorte County20.7-0.2 pts
80Jefferson County20.5-0.1 pts
81Vigo County20.2-0.2 pts
82Tippecanoe County20.2-0.3 pts
83Owen County20-0.3 pts
84Sullivan County19.8-0.3 pts
85Henry County19.7-0.2 pts
86Steuben County19.6-0.1 pts
87Perry County19.6-0.5 pts
88Putnam County19.5-0.2 pts
89Ohio County19.4-0.1 pts
90Delaware County19-0.1 pts
91Brown County16.6-0.3 pts
92Monroe County15.4-0.2 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, 2024) [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, 2024. 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=2024. 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, 2024. 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=2024.

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, 2024 [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=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2024,
  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, 2024}},
  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=2024. 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, 2024
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=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-counties?period=2024.
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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Questions

Which county has the highest population under 18?

LaGrange County, with 31.9% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 15.4% in 2024.

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