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 2020, at 33%. Monroe County had the lowest, at 16.6%. The median was 22.7% and the figure for Indiana was 23.5%. Source: the U.S. Census Bureau.

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Highest33LaGrange County
Lowest16.6Monroe County
Median22.792 counties
Indiana23.5History

Map of counties, 2020

Adams County: 31.5 %Allen County: 25.5 %Bartholomew County: 24.2 %Benton County: 24.9 %Blackford County: 21.3 %Boone County: 26.2 %Brown County: 17.9 %Carroll County: 23.1 %Cass County: 24 %Clark County: 22.7 %Clay County: 22.8 %Clinton County: 26 %Crawford County: 21.6 %Daviess County: 29 %Dearborn County: 22.4 %Decatur County: 23.4 %DeKalb County: 24.4 %Delaware County: 19.3 %Dubois County: 23.5 %Elkhart County: 27.4 %Fayette County: 21.7 %Floyd County: 22.5 %Fountain County: 22 %Franklin County: 23.5 %Fulton County: 23.8 %Gibson County: 24.1 %Grant County: 20.9 %Greene County: 22.3 %Hamilton County: 26.8 %Hancock County: 23.7 %Harrison County: 22.7 %Hendricks County: 25.1 %Henry County: 20.1 %Howard County: 22.2 %Huntington County: 22.1 %Jackson County: 24.6 %Jasper County: 23.8 %Jay County: 25.6 %Jefferson County: 21 %Jennings County: 23.7 %Johnson County: 24.9 %Knox County: 22.1 %Kosciusko County: 23.6 %LaGrange County: 33 %Lake County: 23.5 %LaPorte County: 21.4 %Lawrence County: 21.5 %Madison County: 21.6 %Marion County: 24.4 %Marshall County: 24.8 %Martin County: 22.6 %Miami County: 21.3 %Monroe County: 16.6 %Montgomery County: 23 %Morgan County: 22.4 %Newton County: 21.5 %Noble County: 25 %Ohio County: 20.1 %Orange County: 23.3 %Owen County: 21.1 %Parke County: 23.4 %Perry County: 20.9 %Pike County: 22.6 %Porter County: 22 %Posey County: 22.7 %Pulaski County: 21.9 %Putnam County: 19.5 %Randolph County: 22.4 %Ripley County: 23.4 %Rush County: 22.8 %St. Joseph County: 23.2 %Scott County: 22.4 %Shelby County: 22.7 %Spencer County: 21.9 %Starke County: 22.2 %Steuben County: 20.2 %Sullivan County: 20.2 %Switzerland County: 24.5 %Tippecanoe County: 21 %Tipton County: 21.5 %Union County: 22.1 %Vanderburgh County: 21.8 %Vermillion County: 21.6 %Vigo County: 20.5 %Wabash County: 21.5 %Warren County: 22.4 %Warrick County: 24 %Washington County: 22.9 %Wayne County: 22.5 %Wells County: 24.2 %White County: 23.1 %Whitley County: 22.9 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2020. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

LaGrange County: 33 %LaGrange County33Adams County: 31.5 %Adams County31.5Daviess County: 29 %Daviess County29Elkhart County: 27.4 %Elkhart County27.4Hamilton County: 26.8 %Hamilton County26.8Boone County: 26.2 %Boone County26.2Clinton County: 26 %Clinton County26Jay County: 25.6 %Jay County25.6Allen County: 25.5 %Allen County25.5Hendricks County: 25.1 %Hendricks County25.1Noble County: 25 %Noble County25Johnson County: 24.9 %Johnson County24.9Benton County: 24.9 %Benton County24.9Marshall County: 24.8 %Marshall County24.8Jackson County: 24.6 %Jackson County24.6Switzerland County: 24.5 %Switzerland County24.5DeKalb County: 24.4 %DeKalb County24.4Marion County: 24.4 %Marion County24.4Wells County: 24.2 %Wells County24.2Bartholomew County: 24.2 %Bartholomew County24.2Gibson County: 24.1 %Gibson County24.1Cass County: 24 %Cass County24Warrick County: 24 %Warrick County24Jasper County: 23.8 %Jasper County23.8Fulton County: 23.8 %Fulton County23.8Hancock County: 23.7 %Hancock County23.7Jennings County: 23.7 %Jennings County23.7Kosciusko County: 23.6 %Kosciusko County23.6Lake County: 23.5 %Lake County23.5Dubois County: 23.5 %Dubois County23.5Franklin County: 23.5 %Franklin County23.5Decatur County: 23.4 %Decatur County23.4Ripley County: 23.4 %Ripley County23.4Parke County: 23.4 %Parke County23.4Orange County: 23.3 %Orange County23.3St. Joseph County: 23.2 %St. Joseph County23.2White County: 23.1 %White County23.1Carroll County: 23.1 %Carroll County23.1Montgomery County: 23 %Montgomery County23Washington County: 22.9 %Washington County22.9LaGrange County: 33 %LaGrange County33Adams County: 31.5 %Adams County31.5Daviess County: 29 %Daviess County29Elkhart County: 27.4 %Elkhart County27.4Hamilton County: 26.8 %Hamilton County26.8Boone County: 26.2 %Boone County26.2Clinton County: 26 %Clinton County26Jay County: 25.6 %Jay County25.6Allen County: 25.5 %Allen County25.5Hendricks County: 25.1 %Hendricks County25.1Noble County: 25 %Noble County25Johnson County: 24.9 %Johnson County24.9Benton County: 24.9 %Benton County24.9Marshall County: 24.8 %Marshall County24.8Jackson County: 24.6 %Jackson County24.6Switzerland County: 24.5 %Switzerland County24.5DeKalb County: 24.4 %DeKalb County24.4Marion County: 24.4 %Marion County24.4Wells County: 24.2 %Wells County24.2Bartholomew County: 24.2 %Bartholomew County24.2Gibson County: 24.1 %Gibson County24.1Cass County: 24 %Cass County24Warrick County: 24 %Warrick County24Jasper County: 23.8 %Jasper County23.8Fulton County: 23.8 %Fulton County23.8Hancock County: 23.7 %Hancock County23.7Jennings County: 23.7 %Jennings County23.7Kosciusko County: 23.6 %Kosciusko County23.6Lake County: 23.5 %Lake County23.5Dubois County: 23.5 %Dubois County23.5Franklin County: 23.5 %Franklin County23.5Decatur County: 23.4 %Decatur County23.4Ripley County: 23.4 %Ripley County23.4Parke County: 23.4 %Parke County23.4Orange County: 23.3 %Orange County23.3St. Joseph County: 23.2 %St. Joseph County23.2White County: 23.1 %White County23.1Carroll County: 23.1 %Carroll County23.1Montgomery County: 23 %Montgomery County23Washington County: 22.9 %Washington County22.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1LaGrange County33-0.3 pts
2Adams County31.5+0.1 pts
3Daviess County29-0.1 pts
4Elkhart County27.40 pts
5Hamilton County26.8-0.6 pts
6Boone County26.2-0.3 pts
7Clinton County26+0.1 pts
8Jay County25.6+0.1 pts
9Allen County25.5-0.1 pts
10Hendricks County25.1-0.5 pts
11Noble County25-0.2 pts
12Johnson County24.9-0.2 pts
13Benton County24.9-0.5 pts
14Marshall County24.8-0.2 pts
15Jackson County24.6+0.1 pts
16Switzerland County24.5-0.8 pts
17DeKalb County24.4+0.2 pts
18Marion County24.4+0.2 pts
19Wells County24.2+0.1 pts
20Bartholomew County24.2+0.1 pts
21Gibson County24.1+0.4 pts
22Cass County24-0.3 pts
23Warrick County24-0.3 pts
24Jasper County23.8-0.2 pts
25Fulton County23.8+0.1 pts
26Hancock County23.7-0.2 pts
27Jennings County23.7-0.1 pts
28Kosciusko County23.6-0.1 pts
29Lake County23.5-0.2 pts
30Dubois County23.5-0.1 pts
31Franklin County23.5-0.1 pts
32Decatur County23.4-0 pts
33Ripley County23.4+0.3 pts
34Parke County23.4+0.3 pts
35Orange County23.30 pts
36St. Joseph County23.20 pts
37White County23.1+0.1 pts
38Carroll County23.1-0.3 pts
39Montgomery County23+0.1 pts
40Washington County22.9-0.4 pts
41Whitley County22.9+0.1 pts
42Clay County22.8+0.3 pts
43Rush County22.8-0.1 pts
44Clark County22.7-0.1 pts
45Harrison County22.7-0.1 pts
46Shelby County22.7+0.1 pts
47Posey County22.7-0.1 pts
48Martin County22.6-0.5 pts
49Pike County22.6+0.2 pts
50Wayne County22.5+0.3 pts
51Floyd County22.5+0.1 pts
52Randolph County22.4-0.3 pts
53Warren County22.4-0.1 pts
54Morgan County22.4-0 pts
55Scott County22.4-0.4 pts
56Dearborn County22.40 pts
57Greene County22.3+0.3 pts
58Howard County22.2-0 pts
59Starke County22.2-0.1 pts
60Union County22.1-0.2 pts
61Knox County22.10 pts
62Huntington County22.1+0.1 pts
63Porter County22-0.2 pts
64Fountain County22+0.3 pts
65Spencer County21.9+0.1 pts
66Pulaski County21.9-0.2 pts
67Vanderburgh County21.8+0.1 pts
68Fayette County21.7+0.1 pts
69Madison County21.6-0.1 pts
70Crawford County21.6+0.1 pts
71Vermillion County21.6+0.1 pts
72Tipton County21.5+0.3 pts
73Newton County21.50 pts
74Lawrence County21.5+0.1 pts
75Wabash County21.5-0.1 pts
76LaPorte County21.4+0.1 pts
77Miami County21.3-0.2 pts
78Blackford County21.30 pts
79Owen County21.1-0.3 pts
80Tippecanoe County21-0.2 pts
81Jefferson County21-0.1 pts
82Perry County20.9+0.3 pts
83Grant County20.9+0.2 pts
84Vigo County20.5-0.1 pts
85Steuben County20.2+0.1 pts
86Sullivan County20.2-0 pts
87Ohio County20.1-0.4 pts
88Henry County20.1-0.1 pts
89Putnam County19.5-0.1 pts
90Delaware County19.3-0.1 pts
91Brown County17.9-0.5 pts
92Monroe County16.6-0.1 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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.

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, 2020 [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=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2020,
  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, 2020}},
  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=2020. 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, 2020
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=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-counties?period=2020.
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% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 16.6% in 2020.

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