Data / Rankings / Population under 18 / Counties in Indiana

Counties in Indiana by population under 18, 2025

LaGrange County had the highest population under 18 of 92 counties in 2025, at 31.5%. Monroe County had the lowest, at 15.1%. The median was 22% and the figure for Indiana was 22.6%. Source: the U.S. Census Bureau.

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Highest31.5LaGrange County
Lowest15.1Monroe County
Median2292 counties
Indiana22.6History

Map of counties, 2025

Adams County: 30.7 %Allen County: 24.7 %Bartholomew County: 23 %Benton County: 23.6 %Blackford County: 21.3 %Boone County: 24.3 %Brown County: 16.6 %Carroll County: 21.4 %Cass County: 23.8 %Clark County: 21.6 %Clay County: 22.1 %Clinton County: 24.9 %Crawford County: 20.2 %Daviess County: 29.5 %Dearborn County: 21.1 %Decatur County: 22.7 %DeKalb County: 23.4 %Delaware County: 18.9 %Dubois County: 22.9 %Elkhart County: 26 %Fayette County: 21.7 %Floyd County: 21.7 %Fountain County: 22.9 %Franklin County: 21.7 %Fulton County: 22.7 %Gibson County: 22.8 %Grant County: 20.9 %Greene County: 21.5 %Hamilton County: 24.1 %Hancock County: 22.9 %Harrison County: 21.8 %Hendricks County: 24 %Henry County: 19.5 %Howard County: 22 %Huntington County: 21.4 %Jackson County: 24.7 %Jasper County: 22.8 %Jay County: 25.6 %Jefferson County: 20.4 %Jennings County: 23 %Johnson County: 23.9 %Knox County: 21.5 %Kosciusko County: 22.5 %LaGrange County: 31.5 %Lake County: 22.4 %LaPorte County: 20.4 %Lawrence County: 20.8 %Madison County: 20.9 %Marion County: 24 %Marshall County: 23.6 %Martin County: 22.8 %Miami County: 20.9 %Monroe County: 15.1 %Montgomery County: 22.6 %Morgan County: 21.3 %Newton County: 21 %Noble County: 24.2 %Ohio County: 19.3 %Orange County: 22.8 %Owen County: 19.8 %Parke County: 23.5 %Perry County: 19.3 %Pike County: 21.8 %Porter County: 20.4 %Posey County: 21 %Pulaski County: 21.6 %Putnam County: 19.2 %Randolph County: 22.6 %Ripley County: 23 %Rush County: 22 %St. Joseph County: 22.5 %Scott County: 21.8 %Shelby County: 22 %Spencer County: 21.3 %Starke County: 21.7 %Steuben County: 19.6 %Sullivan County: 19.9 %Switzerland County: 23.1 %Tippecanoe County: 20 %Tipton County: 20.5 %Union County: 20.8 %Vanderburgh County: 21.4 %Vermillion County: 21 %Vigo County: 20 %Wabash County: 20.7 %Warren County: 21.3 %Warrick County: 22.7 %Washington County: 22.1 %Wayne County: 22 %Wells County: 23.6 %White County: 22.7 %Whitley County: 22.3 %
  • Under 20
  • 20 to 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2025. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2025

LaGrange County: 31.5 %LaGrange County31.5Adams County: 30.7 %Adams County30.7Daviess County: 29.5 %Daviess County29.5Elkhart County: 26 %Elkhart County26Jay County: 25.6 %Jay County25.6Clinton County: 24.9 %Clinton County24.9Allen County: 24.7 %Allen County24.7Jackson County: 24.7 %Jackson County24.7Boone County: 24.3 %Boone County24.3Noble County: 24.2 %Noble County24.2Hamilton County: 24.1 %Hamilton County24.1Hendricks County: 24 %Hendricks County24Marion County: 24 %Marion County24Johnson County: 23.9 %Johnson County23.9Cass County: 23.8 %Cass County23.8Marshall County: 23.6 %Marshall County23.6Benton County: 23.6 %Benton County23.6Wells County: 23.6 %Wells County23.6Parke County: 23.5 %Parke County23.5DeKalb County: 23.4 %DeKalb County23.4Switzerland County: 23.1 %Switzerland County23.1Ripley County: 23 %Ripley County23Jennings County: 23 %Jennings County23Bartholomew County: 23 %Bartholomew County23Hancock County: 22.9 %Hancock County22.9Dubois County: 22.9 %Dubois County22.9Fountain County: 22.9 %Fountain County22.9Jasper County: 22.8 %Jasper County22.8Orange County: 22.8 %Orange County22.8Martin County: 22.8 %Martin County22.8Gibson County: 22.8 %Gibson County22.8Warrick County: 22.7 %Warrick County22.7Decatur County: 22.7 %Decatur County22.7White County: 22.7 %White County22.7Fulton County: 22.7 %Fulton County22.7Montgomery County: 22.6 %Montgomery County22.6Randolph County: 22.6 %Randolph County22.6St. Joseph County: 22.5 %St. Joseph County22.5Kosciusko County: 22.5 %Kosciusko County22.5Lake County: 22.4 %Lake County22.4LaGrange County: 31.5 %LaGrange County31.5Adams County: 30.7 %Adams County30.7Daviess County: 29.5 %Daviess County29.5Elkhart County: 26 %Elkhart County26Jay County: 25.6 %Jay County25.6Clinton County: 24.9 %Clinton County24.9Allen County: 24.7 %Allen County24.7Jackson County: 24.7 %Jackson County24.7Boone County: 24.3 %Boone County24.3Noble County: 24.2 %Noble County24.2Hamilton County: 24.1 %Hamilton County24.1Hendricks County: 24 %Hendricks County24Marion County: 24 %Marion County24Johnson County: 23.9 %Johnson County23.9Cass County: 23.8 %Cass County23.8Marshall County: 23.6 %Marshall County23.6Benton County: 23.6 %Benton County23.6Wells County: 23.6 %Wells County23.6Parke County: 23.5 %Parke County23.5DeKalb County: 23.4 %DeKalb County23.4Switzerland County: 23.1 %Switzerland County23.1Ripley County: 23 %Ripley County23Jennings County: 23 %Jennings County23Bartholomew County: 23 %Bartholomew County23Hancock County: 22.9 %Hancock County22.9Dubois County: 22.9 %Dubois County22.9Fountain County: 22.9 %Fountain County22.9Jasper County: 22.8 %Jasper County22.8Orange County: 22.8 %Orange County22.8Martin County: 22.8 %Martin County22.8Gibson County: 22.8 %Gibson County22.8Warrick County: 22.7 %Warrick County22.7Decatur County: 22.7 %Decatur County22.7White County: 22.7 %White County22.7Fulton County: 22.7 %Fulton County22.7Montgomery County: 22.6 %Montgomery County22.6Randolph County: 22.6 %Randolph County22.6St. Joseph County: 22.5 %St. Joseph County22.5Kosciusko County: 22.5 %Kosciusko County22.5Lake County: 22.4 %Lake County22.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1LaGrange County31.5-0.4 pts
2Adams County30.7-0.5 pts
3Daviess County29.5-0.1 pts
4Elkhart County26-0.3 pts
5Jay County25.6-0.2 pts
6Clinton County24.9-0.3 pts
7Allen County24.7-0.2 pts
8Jackson County24.7-0.1 pts
9Boone County24.3-0.5 pts
10Noble County24.2-0.3 pts
11Hamilton County24.1-0.6 pts
12Hendricks County24-0.4 pts
13Marion County24-0.1 pts
14Johnson County23.9-0.3 pts
15Cass County23.8-0.2 pts
16Marshall County23.6-0.3 pts
17Benton County23.6-0.4 pts
18Wells County23.6-0.4 pts
19Parke County23.5-0.3 pts
20DeKalb County23.4-0.3 pts
21Switzerland County23.1-0.9 pts
22Ripley County23-0.1 pts
23Jennings County23-0.3 pts
24Bartholomew County23-0.2 pts
25Hancock County22.9-0.3 pts
26Dubois County22.9-0.2 pts
27Fountain County22.9+0.2 pts
28Jasper County22.8-0.2 pts
29Orange County22.8-0.1 pts
30Martin County22.8+0.2 pts
31Gibson County22.8-0.1 pts
32Warrick County22.7-0.3 pts
33Decatur County22.7-0.1 pts
34White County22.7-0.4 pts
35Fulton County22.70 pts
36Montgomery County22.6-0 pts
37Randolph County22.6+0.1 pts
38St. Joseph County22.5-0.3 pts
39Kosciusko County22.5-0.3 pts
40Lake County22.4-0.3 pts
41Whitley County22.3-0.2 pts
42Clay County22.10 pts
43Washington County22.1-0.3 pts
44Wayne County22-0.3 pts
45Rush County22-0.1 pts
46Shelby County22-0.1 pts
47Howard County22-0.1 pts
48Scott County21.8-0.2 pts
49Harrison County21.8-0.2 pts
50Pike County21.8-0.2 pts
51Franklin County21.7-0.4 pts
52Floyd County21.7-0.3 pts
53Fayette County21.7-0.3 pts
54Starke County21.7-0.1 pts
55Clark County21.6-0.2 pts
56Pulaski County21.6-0.3 pts
57Knox County21.5-0.2 pts
58Greene County21.5-0.3 pts
59Carroll County21.4-0.6 pts
60Huntington County21.4-0.2 pts
61Vanderburgh County21.4-0.1 pts
62Warren County21.3-0.1 pts
63Morgan County21.3-0.2 pts
64Spencer County21.3-0.3 pts
65Blackford County21.3-0.2 pts
66Dearborn County21.1-0.4 pts
67Vermillion County21-0.1 pts
68Newton County210 pts
69Posey County21-0.5 pts
70Madison County20.9-0.3 pts
71Miami County20.9-0.6 pts
72Grant County20.9-0.1 pts
73Union County20.8-0.4 pts
74Lawrence County20.8-0.1 pts
75Wabash County20.7-0.2 pts
76Tipton County20.5-0.2 pts
77Jefferson County20.4-0 pts
78LaPorte County20.4-0.3 pts
79Porter County20.4-0.4 pts
80Crawford County20.2-0.6 pts
81Vigo County20-0.2 pts
82Tippecanoe County20-0.2 pts
83Sullivan County19.9+0.1 pts
84Owen County19.8-0.2 pts
85Steuben County19.6-0 pts
86Henry County19.5-0.3 pts
87Ohio County19.3-0.2 pts
88Perry County19.3-0.3 pts
89Putnam County19.2-0.3 pts
90Delaware County18.9-0.1 pts
91Brown County16.6-0 pts
92Monroe County15.1-0.4 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, 2025) [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, 2025. 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. 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, 2025. 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.

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, 2025 [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 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2025,
  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, 2025}},
  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. 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, 2025
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-counties.
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 31.5% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 15.1% in 2025.

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