Data / Rankings / Population aged 18 to 64 / Counties in Indiana

Counties in Indiana by population aged 18 to 64, 2025

Monroe County had the highest population aged 18 to 64 of 92 counties in 2025, at 68.7%. Adams County had the lowest, at 51.4%. The median was 56.9% and the figure for Indiana was 59%. Source: the U.S. Census Bureau.

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Highest68.7Monroe County
Lowest51.4Adams County
Median56.992 counties
Indiana59History

Map of counties, 2025

Adams County: 51.4 %Allen County: 58.3 %Bartholomew County: 58.6 %Benton County: 56.8 %Blackford County: 55.3 %Boone County: 58.6 %Brown County: 54.5 %Carroll County: 56.3 %Cass County: 56.2 %Clark County: 60.2 %Clay County: 56.1 %Clinton County: 56.4 %Crawford County: 56 %Daviess County: 53.2 %Dearborn County: 57.5 %Decatur County: 57.1 %DeKalb County: 57.1 %Delaware County: 61.9 %Dubois County: 55.6 %Elkhart County: 57.4 %Fayette County: 56.1 %Floyd County: 58.9 %Fountain County: 55.5 %Franklin County: 56 %Fulton County: 54.3 %Gibson County: 56.6 %Grant County: 58 %Greene County: 56.5 %Hamilton County: 59.9 %Hancock County: 58.3 %Harrison County: 56.6 %Hendricks County: 59.1 %Henry County: 58.7 %Howard County: 56.4 %Huntington County: 57.1 %Jackson County: 56.9 %Jasper County: 56.8 %Jay County: 54.1 %Jefferson County: 58.4 %Jennings County: 58.3 %Johnson County: 58.9 %Knox County: 57.7 %Kosciusko County: 57.2 %LaGrange County: 52.7 %Lake County: 58.4 %LaPorte County: 58.5 %Lawrence County: 57.2 %Madison County: 59.1 %Marion County: 61.5 %Marshall County: 55.8 %Martin County: 54.3 %Miami County: 59.3 %Monroe County: 68.7 %Montgomery County: 57.3 %Morgan County: 57.6 %Newton County: 56.9 %Noble County: 56.5 %Ohio County: 54.9 %Orange County: 54.3 %Owen County: 57.4 %Parke County: 55 %Perry County: 59.2 %Pike County: 56.1 %Porter County: 59 %Posey County: 55.5 %Pulaski County: 54.7 %Putnam County: 61.4 %Randolph County: 54.7 %Ripley County: 55.5 %Rush County: 57.2 %St. Joseph County: 59.4 %Scott County: 59.9 %Shelby County: 57.4 %Spencer County: 56 %Starke County: 55.6 %Steuben County: 57 %Sullivan County: 59.5 %Switzerland County: 57.2 %Tippecanoe County: 66.1 %Tipton County: 55.8 %Union County: 55.9 %Vanderburgh County: 58.9 %Vermillion County: 56.7 %Vigo County: 61.3 %Wabash County: 54.8 %Warren County: 55.3 %Warrick County: 56.3 %Washington County: 57.7 %Wayne County: 56.7 %Wells County: 54.7 %White County: 54 %Whitley County: 55.8 %
  • Under 55
  • 55 to 56
  • 56 to 57
  • 57 to 58
  • 58 to 59
  • 59 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

Monroe County: 68.7 %Monroe County68.7Tippecanoe County: 66.1 %Tippecanoe County66.1Delaware County: 61.9 %Delaware County61.9Marion County: 61.5 %Marion County61.5Putnam County: 61.4 %Putnam County61.4Vigo County: 61.3 %Vigo County61.3Clark County: 60.2 %Clark County60.2Scott County: 59.9 %Scott County59.9Hamilton County: 59.9 %Hamilton County59.9Sullivan County: 59.5 %Sullivan County59.5St. Joseph County: 59.4 %St. Joseph County59.4Miami County: 59.3 %Miami County59.3Perry County: 59.2 %Perry County59.2Madison County: 59.1 %Madison County59.1Hendricks County: 59.1 %Hendricks County59.1Porter County: 59 %Porter County59Vanderburgh County: 58.9 %Vanderburgh County58.9Johnson County: 58.9 %Johnson County58.9Floyd County: 58.9 %Floyd County58.9Henry County: 58.7 %Henry County58.7Boone County: 58.6 %Boone County58.6Bartholomew County: 58.6 %Bartholomew County58.6LaPorte County: 58.5 %LaPorte County58.5Jefferson County: 58.4 %Jefferson County58.4Lake County: 58.4 %Lake County58.4Hancock County: 58.3 %Hancock County58.3Allen County: 58.3 %Allen County58.3Jennings County: 58.3 %Jennings County58.3Grant County: 58 %Grant County58Washington County: 57.7 %Washington County57.7Knox County: 57.7 %Knox County57.7Morgan County: 57.6 %Morgan County57.6Dearborn County: 57.5 %Dearborn County57.5Owen County: 57.4 %Owen County57.4Elkhart County: 57.4 %Elkhart County57.4Shelby County: 57.4 %Shelby County57.4Montgomery County: 57.3 %Montgomery County57.3Lawrence County: 57.2 %Lawrence County57.2Kosciusko County: 57.2 %Kosciusko County57.2Rush County: 57.2 %Rush County57.2Monroe County: 68.7 %Monroe County68.7Tippecanoe County: 66.1 %Tippecanoe County66.1Delaware County: 61.9 %Delaware County61.9Marion County: 61.5 %Marion County61.5Putnam County: 61.4 %Putnam County61.4Vigo County: 61.3 %Vigo County61.3Clark County: 60.2 %Clark County60.2Scott County: 59.9 %Scott County59.9Hamilton County: 59.9 %Hamilton County59.9Sullivan County: 59.5 %Sullivan County59.5St. Joseph County: 59.4 %St. Joseph County59.4Miami County: 59.3 %Miami County59.3Perry County: 59.2 %Perry County59.2Madison County: 59.1 %Madison County59.1Hendricks County: 59.1 %Hendricks County59.1Porter County: 59 %Porter County59Vanderburgh County: 58.9 %Vanderburgh County58.9Johnson County: 58.9 %Johnson County58.9Floyd County: 58.9 %Floyd County58.9Henry County: 58.7 %Henry County58.7Boone County: 58.6 %Boone County58.6Bartholomew County: 58.6 %Bartholomew County58.6LaPorte County: 58.5 %LaPorte County58.5Jefferson County: 58.4 %Jefferson County58.4Lake County: 58.4 %Lake County58.4Hancock County: 58.3 %Hancock County58.3Allen County: 58.3 %Allen County58.3Jennings County: 58.3 %Jennings County58.3Grant County: 58 %Grant County58Washington County: 57.7 %Washington County57.7Knox County: 57.7 %Knox County57.7Morgan County: 57.6 %Morgan County57.6Dearborn County: 57.5 %Dearborn County57.5Owen County: 57.4 %Owen County57.4Elkhart County: 57.4 %Elkhart County57.4Shelby County: 57.4 %Shelby County57.4Montgomery County: 57.3 %Montgomery County57.3Lawrence County: 57.2 %Lawrence County57.2Kosciusko County: 57.2 %Kosciusko County57.2Rush County: 57.2 %Rush County57.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Monroe County68.7+0.1 pts
2Tippecanoe County66.1-0.1 pts
3Delaware County61.9-0 pts
4Marion County61.5-0.3 pts
5Putnam County61.4-0.2 pts
6Vigo County61.3-0 pts
7Clark County60.2-0 pts
8Scott County59.9+0.2 pts
9Hamilton County59.90 pts
10Sullivan County59.5-0.2 pts
11St. Joseph County59.4-0 pts
12Miami County59.3+0.2 pts
13Perry County59.2-0.1 pts
14Madison County59.1+0.2 pts
15Hendricks County59.1-0.1 pts
16Porter County59-0.2 pts
17Vanderburgh County58.9-0.2 pts
18Johnson County58.90 pts
19Floyd County58.9-0.2 pts
20Henry County58.7-0.2 pts
21Boone County58.6+0.1 pts
22Bartholomew County58.6-0.1 pts
23LaPorte County58.5-0.2 pts
24Jefferson County58.4-0.3 pts
25Lake County58.4-0.2 pts
26Hancock County58.3-0.1 pts
27Allen County58.3-0.1 pts
28Jennings County58.3-0.2 pts
29Grant County58-0.2 pts
30Washington County57.7-0.2 pts
31Knox County57.7-0.3 pts
32Morgan County57.6-0.4 pts
33Dearborn County57.5-0.4 pts
34Owen County57.4-0 pts
35Elkhart County57.40 pts
36Shelby County57.4-0.3 pts
37Montgomery County57.3-0.4 pts
38Lawrence County57.2-0.1 pts
39Kosciusko County57.2-0.3 pts
40Rush County57.2-0.5 pts
41Switzerland County57.2+0.5 pts
42Huntington County57.1-0.1 pts
43DeKalb County57.1-0.3 pts
44Decatur County57.1-0.3 pts
45Steuben County57-0.5 pts
46Newton County56.9-0.4 pts
47Jackson County56.9-0.2 pts
48Benton County56.8+0.1 pts
49Jasper County56.8-0.3 pts
50Vermillion County56.7-0.3 pts
51Wayne County56.7-0.1 pts
52Gibson County56.6-0.1 pts
53Harrison County56.6-0.4 pts
54Noble County56.5-0.3 pts
55Greene County56.5-0.2 pts
56Clinton County56.4-0.1 pts
57Howard County56.4-0.3 pts
58Warrick County56.3-0.3 pts
59Carroll County56.3-0.2 pts
60Cass County56.2-0.2 pts
61Fayette County56.1+0.1 pts
62Pike County56.1-0.2 pts
63Clay County56.1-0.5 pts
64Crawford County56-0.1 pts
65Spencer County56-0.4 pts
66Franklin County56-0.2 pts
67Union County55.9-0.2 pts
68Tipton County55.8-0.3 pts
69Marshall County55.8-0.2 pts
70Whitley County55.8-0.4 pts
71Dubois County55.6-0.6 pts
72Starke County55.6-0.2 pts
73Posey County55.5-0.2 pts
74Fountain County55.5-0.4 pts
75Ripley County55.5-0.5 pts
76Warren County55.3-0.4 pts
77Blackford County55.3-0.2 pts
78Parke County55-0 pts
79Ohio County54.9-0.8 pts
80Wabash County54.8-0.2 pts
81Randolph County54.7-0.3 pts
82Wells County54.7-0.3 pts
83Pulaski County54.7-0.1 pts
84Brown County54.5-0.5 pts
85Fulton County54.3-0.4 pts
86Orange County54.3-0.3 pts
87Martin County54.3-0.5 pts
88Jay County54.1-0.4 pts
89White County54-0.1 pts
90Daviess County53.2-0.3 pts
91LaGrange County52.7-0 pts
92Adams County51.4+0.1 pts

Other periods

About this ranking

Residents aged 18 to 64 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.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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 18 to 64 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 18 to 64 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 aged 18 to 64, 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 18 to 64 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 aged 18 to 64, 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-18-64/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 18 to 64 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 aged 18 to 64, 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-18-64/indiana-counties.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64, 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/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 18 to 64 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 aged 18 to 64, 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-18-64/indiana-counties. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 18 to 64 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 aged 18 to 64, 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-18-64/indiana-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/indiana-counties.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64?

Monroe County, with 68.7% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Adams County, with 51.4% 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 18 to 64 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 aged 18 to 64: other rankings

Counties in Indiana: more rankings