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 2018, at 33.4%. Monroe County had the lowest, at 16.6%. The median was 22.9% and the figure for Indiana was 23.7%. Source: the U.S. Census Bureau.

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Highest33.4LaGrange County
Lowest16.6Monroe County
Median22.992 counties
Indiana23.7History

Map of counties, 2018

Adams County: 31.5 %Allen County: 25.8 %Bartholomew County: 24 %Benton County: 25.1 %Blackford County: 21.5 %Boone County: 26.7 %Brown County: 18.9 %Carroll County: 23.6 %Cass County: 24.5 %Clark County: 23 %Clay County: 22.7 %Clinton County: 26.1 %Crawford County: 21.5 %Daviess County: 29.1 %Dearborn County: 22.5 %Decatur County: 24 %DeKalb County: 24.3 %Delaware County: 19.4 %Dubois County: 23.8 %Elkhart County: 27.6 %Fayette County: 21.9 %Floyd County: 22.5 %Fountain County: 21.9 %Franklin County: 23.7 %Fulton County: 23.7 %Gibson County: 23.7 %Grant County: 20.8 %Greene County: 22.4 %Hamilton County: 27.7 %Hancock County: 24 %Harrison County: 23 %Hendricks County: 25.8 %Henry County: 20.4 %Howard County: 22.3 %Huntington County: 21.9 %Jackson County: 24.7 %Jasper County: 24 %Jay County: 25.9 %Jefferson County: 21.1 %Jennings County: 23.6 %Johnson County: 25.2 %Knox County: 22.1 %Kosciusko County: 24 %LaGrange County: 33.4 %Lake County: 23.9 %LaPorte County: 21.5 %Lawrence County: 21.6 %Madison County: 21.9 %Marion County: 24.3 %Marshall County: 25.2 %Martin County: 23 %Miami County: 21.7 %Monroe County: 16.6 %Montgomery County: 23.1 %Morgan County: 22.6 %Newton County: 21.6 %Noble County: 25.3 %Ohio County: 20.7 %Orange County: 23.3 %Owen County: 21.6 %Parke County: 23 %Perry County: 20.8 %Pike County: 22.3 %Porter County: 22.4 %Posey County: 22.8 %Pulaski County: 22.4 %Putnam County: 19.9 %Randolph County: 22.9 %Ripley County: 23.4 %Rush County: 23 %St. Joseph County: 23.3 %Scott County: 22.9 %Shelby County: 22.8 %Spencer County: 22.2 %Starke County: 22.6 %Steuben County: 20.3 %Sullivan County: 20.4 %Switzerland County: 25.2 %Tippecanoe County: 21.3 %Tipton County: 21.3 %Union County: 21.5 %Vanderburgh County: 21.7 %Vermillion County: 21.5 %Vigo County: 20.6 %Wabash County: 21.6 %Warren County: 22.9 %Warrick County: 24.6 %Washington County: 23.2 %Wayne County: 22.3 %Wells County: 24.2 %White County: 23.4 %Whitley County: 23.2 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 and over
%, 2018. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2018

LaGrange County: 33.4 %LaGrange County33.4Adams County: 31.5 %Adams County31.5Daviess County: 29.1 %Daviess County29.1Hamilton County: 27.7 %Hamilton County27.7Elkhart County: 27.6 %Elkhart County27.6Boone County: 26.7 %Boone County26.7Clinton County: 26.1 %Clinton County26.1Jay County: 25.9 %Jay County25.9Hendricks County: 25.8 %Hendricks County25.8Allen County: 25.8 %Allen County25.8Noble County: 25.3 %Noble County25.3Switzerland County: 25.2 %Switzerland County25.2Johnson County: 25.2 %Johnson County25.2Marshall County: 25.2 %Marshall County25.2Benton County: 25.1 %Benton County25.1Jackson County: 24.7 %Jackson County24.7Warrick County: 24.6 %Warrick County24.6Cass County: 24.5 %Cass County24.5DeKalb County: 24.3 %DeKalb County24.3Marion County: 24.3 %Marion County24.3Wells County: 24.2 %Wells County24.2Bartholomew County: 24 %Bartholomew County24Jasper County: 24 %Jasper County24Decatur County: 24 %Decatur County24Hancock County: 24 %Hancock County24Kosciusko County: 24 %Kosciusko County24Lake County: 23.9 %Lake County23.9Dubois County: 23.8 %Dubois County23.8Gibson County: 23.7 %Gibson County23.7Franklin County: 23.7 %Franklin County23.7Fulton County: 23.7 %Fulton County23.7Jennings County: 23.6 %Jennings County23.6Carroll County: 23.6 %Carroll County23.6Ripley County: 23.4 %Ripley County23.4White County: 23.4 %White County23.4St. Joseph County: 23.3 %St. Joseph County23.3Orange County: 23.3 %Orange County23.3Whitley County: 23.2 %Whitley County23.2Washington County: 23.2 %Washington County23.2Montgomery County: 23.1 %Montgomery County23.1LaGrange County: 33.4 %LaGrange County33.4Adams County: 31.5 %Adams County31.5Daviess County: 29.1 %Daviess County29.1Hamilton County: 27.7 %Hamilton County27.7Elkhart County: 27.6 %Elkhart County27.6Boone County: 26.7 %Boone County26.7Clinton County: 26.1 %Clinton County26.1Jay County: 25.9 %Jay County25.9Hendricks County: 25.8 %Hendricks County25.8Allen County: 25.8 %Allen County25.8Noble County: 25.3 %Noble County25.3Switzerland County: 25.2 %Switzerland County25.2Johnson County: 25.2 %Johnson County25.2Marshall County: 25.2 %Marshall County25.2Benton County: 25.1 %Benton County25.1Jackson County: 24.7 %Jackson County24.7Warrick County: 24.6 %Warrick County24.6Cass County: 24.5 %Cass County24.5DeKalb County: 24.3 %DeKalb County24.3Marion County: 24.3 %Marion County24.3Wells County: 24.2 %Wells County24.2Bartholomew County: 24 %Bartholomew County24Jasper County: 24 %Jasper County24Decatur County: 24 %Decatur County24Hancock County: 24 %Hancock County24Kosciusko County: 24 %Kosciusko County24Lake County: 23.9 %Lake County23.9Dubois County: 23.8 %Dubois County23.8Gibson County: 23.7 %Gibson County23.7Franklin County: 23.7 %Franklin County23.7Fulton County: 23.7 %Fulton County23.7Jennings County: 23.6 %Jennings County23.6Carroll County: 23.6 %Carroll County23.6Ripley County: 23.4 %Ripley County23.4White County: 23.4 %White County23.4St. Joseph County: 23.3 %St. Joseph County23.3Orange County: 23.3 %Orange County23.3Whitley County: 23.2 %Whitley County23.2Washington County: 23.2 %Washington County23.2Montgomery County: 23.1 %Montgomery County23.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1LaGrange County33.4-0.3 pts
2Adams County31.5+0.1 pts
3Daviess County29.1-0 pts
4Hamilton County27.7-0.3 pts
5Elkhart County27.6-0.2 pts
6Boone County26.7-0.2 pts
7Clinton County26.1-0.1 pts
8Jay County25.9-0.1 pts
9Hendricks County25.8-0.3 pts
10Allen County25.8-0.1 pts
11Noble County25.3-0.2 pts
12Switzerland County25.2-0.3 pts
13Johnson County25.2-0.1 pts
14Marshall County25.2-0 pts
15Benton County25.1-0.2 pts
16Jackson County24.7-0.1 pts
17Warrick County24.6-0.3 pts
18Cass County24.5-0 pts
19DeKalb County24.3-0.1 pts
20Marion County24.3-0.1 pts
21Wells County24.2-0.1 pts
22Bartholomew County24-0 pts
23Jasper County24-0.3 pts
24Decatur County24-0.2 pts
25Hancock County24-0 pts
26Kosciusko County24-0.2 pts
27Lake County23.9-0.2 pts
28Dubois County23.8-0.1 pts
29Gibson County23.7+0.2 pts
30Franklin County23.70 pts
31Fulton County23.7-0.2 pts
32Jennings County23.60 pts
33Carroll County23.6+0.1 pts
34Ripley County23.4-0.3 pts
35White County23.4-0 pts
36St. Joseph County23.3-0.2 pts
37Orange County23.3-0.1 pts
38Whitley County23.2+0.1 pts
39Washington County23.2-0.1 pts
40Montgomery County23.1-0.1 pts
41Martin County23-0 pts
42Parke County23-0.1 pts
43Clark County23-0.1 pts
44Harrison County23-0 pts
44Rush County23-0.2 pts
46Warren County22.9+0.4 pts
47Randolph County22.9-0.3 pts
48Scott County22.9-0 pts
49Shelby County22.8-0.2 pts
50Posey County22.8-0 pts
51Clay County22.7-0 pts
52Morgan County22.6-0.2 pts
53Starke County22.60 pts
54Floyd County22.5-0.1 pts
55Dearborn County22.5-0.3 pts
56Porter County22.4-0.2 pts
57Pulaski County22.40 pts
58Greene County22.4-0 pts
59Wayne County22.30 pts
60Howard County22.3-0.1 pts
61Pike County22.3+0.2 pts
62Spencer County22.2-0.1 pts
63Knox County22.1-0.1 pts
64Madison County21.9-0.2 pts
65Fayette County21.9-0.1 pts
65Fountain County21.9-0.4 pts
65Huntington County21.9-0.1 pts
68Vanderburgh County21.7-0.1 pts
69Miami County21.7-0.3 pts
70Newton County21.6-0.4 pts
71Wabash County21.6-0.1 pts
72Lawrence County21.6-0.2 pts
73Owen County21.6-0 pts
74Union County21.5-0.9 pts
75Crawford County21.50 pts
76LaPorte County21.5-0.2 pts
77Blackford County21.5+0.1 pts
78Vermillion County21.5-0.4 pts
79Tippecanoe County21.30 pts
80Tipton County21.3-0.2 pts
81Jefferson County21.1-0.1 pts
82Perry County20.8-0.2 pts
83Grant County20.8+0.1 pts
84Ohio County20.7+0.5 pts
85Vigo County20.6-0.1 pts
86Sullivan County20.4-0.1 pts
87Henry County20.4-0.2 pts
88Steuben County20.3-0.2 pts
89Putnam County19.9-0.2 pts
90Delaware County19.40 pts
91Brown County18.9-0.2 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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.

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, 2018 [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=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2018,
  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, 2018}},
  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=2018. 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, 2018
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=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/indiana-counties?period=2018.
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 33.4% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Monroe County, with 16.6% in 2018.

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