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

Counties in Indiana by population aged 18 to 64

Monroe County had the highest population aged 18 to 64 of 92 counties in 2024, at 68.7%. Adams County had the lowest, at 51.3%. The median was 57.1% and the figure for Indiana was 59.1%. Source: the U.S. Census Bureau.

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Highest68.7Monroe County
Lowest51.3Adams County
Median57.192 counties
Indiana59.1History

Map of counties, 2024

Adams County: 51.3 %Allen County: 58.4 %Bartholomew County: 58.7 %Benton County: 56.8 %Blackford County: 55.5 %Boone County: 58.6 %Brown County: 54.9 %Carroll County: 56.5 %Cass County: 56.4 %Clark County: 60.2 %Clay County: 56.6 %Clinton County: 56.5 %Crawford County: 56.1 %Daviess County: 53.4 %Dearborn County: 57.9 %Decatur County: 57.4 %DeKalb County: 57.4 %Delaware County: 61.9 %Dubois County: 56.2 %Elkhart County: 57.4 %Fayette County: 56.1 %Floyd County: 59 %Fountain County: 55.9 %Franklin County: 56.2 %Fulton County: 54.8 %Gibson County: 56.7 %Grant County: 58.2 %Greene County: 56.7 %Hamilton County: 59.9 %Hancock County: 58.4 %Harrison County: 57 %Hendricks County: 59.1 %Henry County: 58.9 %Howard County: 56.7 %Huntington County: 57.2 %Jackson County: 57.2 %Jasper County: 57 %Jay County: 54.5 %Jefferson County: 58.7 %Jennings County: 58.5 %Johnson County: 58.9 %Knox County: 57.9 %Kosciusko County: 57.5 %LaGrange County: 52.8 %Lake County: 58.6 %LaPorte County: 58.6 %Lawrence County: 57.3 %Madison County: 58.9 %Marion County: 61.8 %Marshall County: 56 %Martin County: 54.8 %Miami County: 59.1 %Monroe County: 68.7 %Montgomery County: 57.6 %Morgan County: 58 %Newton County: 57.3 %Noble County: 56.8 %Ohio County: 55.8 %Orange County: 54.7 %Owen County: 57.5 %Parke County: 55 %Perry County: 59.3 %Pike County: 56.3 %Porter County: 59.2 %Posey County: 55.7 %Pulaski County: 54.9 %Putnam County: 61.6 %Randolph County: 55.1 %Ripley County: 55.9 %Rush County: 57.7 %St. Joseph County: 59.4 %Scott County: 59.7 %Shelby County: 57.6 %Spencer County: 56.4 %Starke County: 55.7 %Steuben County: 57.5 %Sullivan County: 59.7 %Switzerland County: 56.6 %Tippecanoe County: 66.2 %Tipton County: 56.1 %Union County: 56.1 %Vanderburgh County: 59.2 %Vermillion County: 57.1 %Vigo County: 61.3 %Wabash County: 54.9 %Warren County: 55.7 %Warrick County: 56.6 %Washington County: 57.9 %Wayne County: 56.8 %Wells County: 55 %White County: 54.1 %Whitley County: 56.2 %
  • Under 56
  • 56 to 57
  • 57 to 58
  • 58 to 59
  • 59 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

Monroe County: 68.7 %Monroe County68.7Tippecanoe County: 66.2 %Tippecanoe County66.2Delaware County: 61.9 %Delaware County61.9Marion County: 61.8 %Marion County61.8Putnam County: 61.6 %Putnam County61.6Vigo County: 61.3 %Vigo County61.3Clark County: 60.2 %Clark County60.2Hamilton County: 59.9 %Hamilton County59.9Scott County: 59.7 %Scott County59.7Sullivan County: 59.7 %Sullivan County59.7St. Joseph County: 59.4 %St. Joseph County59.4Perry County: 59.3 %Perry County59.3Porter County: 59.2 %Porter County59.2Vanderburgh County: 59.2 %Vanderburgh County59.2Hendricks County: 59.1 %Hendricks County59.1Miami County: 59.1 %Miami County59.1Floyd County: 59 %Floyd County59Johnson County: 58.9 %Johnson County58.9Henry County: 58.9 %Henry County58.9Madison County: 58.9 %Madison County58.9Jefferson County: 58.7 %Jefferson County58.7Bartholomew County: 58.7 %Bartholomew County58.7LaPorte County: 58.6 %LaPorte County58.6Boone County: 58.6 %Boone County58.6Lake County: 58.6 %Lake County58.6Jennings County: 58.5 %Jennings County58.5Hancock County: 58.4 %Hancock County58.4Allen County: 58.4 %Allen County58.4Grant County: 58.2 %Grant County58.2Morgan County: 58 %Morgan County58Knox County: 57.9 %Knox County57.9Dearborn County: 57.9 %Dearborn County57.9Washington County: 57.9 %Washington County57.9Rush County: 57.7 %Rush County57.7Montgomery County: 57.6 %Montgomery County57.6Shelby County: 57.6 %Shelby County57.6Steuben County: 57.5 %Steuben County57.5Kosciusko County: 57.5 %Kosciusko County57.5Owen County: 57.5 %Owen County57.5DeKalb County: 57.4 %DeKalb County57.4Monroe County: 68.7 %Monroe County68.7Tippecanoe County: 66.2 %Tippecanoe County66.2Delaware County: 61.9 %Delaware County61.9Marion County: 61.8 %Marion County61.8Putnam County: 61.6 %Putnam County61.6Vigo County: 61.3 %Vigo County61.3Clark County: 60.2 %Clark County60.2Hamilton County: 59.9 %Hamilton County59.9Scott County: 59.7 %Scott County59.7Sullivan County: 59.7 %Sullivan County59.7St. Joseph County: 59.4 %St. Joseph County59.4Perry County: 59.3 %Perry County59.3Porter County: 59.2 %Porter County59.2Vanderburgh County: 59.2 %Vanderburgh County59.2Hendricks County: 59.1 %Hendricks County59.1Miami County: 59.1 %Miami County59.1Floyd County: 59 %Floyd County59Johnson County: 58.9 %Johnson County58.9Henry County: 58.9 %Henry County58.9Madison County: 58.9 %Madison County58.9Jefferson County: 58.7 %Jefferson County58.7Bartholomew County: 58.7 %Bartholomew County58.7LaPorte County: 58.6 %LaPorte County58.6Boone County: 58.6 %Boone County58.6Lake County: 58.6 %Lake County58.6Jennings County: 58.5 %Jennings County58.5Hancock County: 58.4 %Hancock County58.4Allen County: 58.4 %Allen County58.4Grant County: 58.2 %Grant County58.2Morgan County: 58 %Morgan County58Knox County: 57.9 %Knox County57.9Dearborn County: 57.9 %Dearborn County57.9Washington County: 57.9 %Washington County57.9Rush County: 57.7 %Rush County57.7Montgomery County: 57.6 %Montgomery County57.6Shelby County: 57.6 %Shelby County57.6Steuben County: 57.5 %Steuben County57.5Kosciusko County: 57.5 %Kosciusko County57.5Owen County: 57.5 %Owen County57.5DeKalb County: 57.4 %DeKalb County57.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Monroe County68.7-0.3 pts
2Tippecanoe County66.20 pts
3Delaware County61.9-0.1 pts
4Marion County61.8-0.2 pts
5Putnam County61.6-0.1 pts
6Vigo County61.3-0.1 pts
7Clark County60.2-0.1 pts
8Hamilton County59.90 pts
9Scott County59.70 pts
10Sullivan County59.7+0.1 pts
11St. Joseph County59.4-0.1 pts
12Perry County59.3+0.2 pts
13Porter County59.2-0.3 pts
14Vanderburgh County59.2-0.3 pts
15Hendricks County59.10 pts
16Miami County59.1-0 pts
17Floyd County59-0.2 pts
18Johnson County58.9-0 pts
19Henry County58.9-0.3 pts
20Madison County58.9+0.1 pts
21Jefferson County58.7-0.4 pts
22Bartholomew County58.7-0.1 pts
23LaPorte County58.6-0.2 pts
24Boone County58.6+0.3 pts
25Lake County58.6-0.2 pts
26Jennings County58.5-0.4 pts
27Hancock County58.4-0.1 pts
28Allen County58.4-0.1 pts
29Grant County58.2-0.3 pts
30Morgan County58-0.4 pts
31Knox County57.9-0.2 pts
32Dearborn County57.9-0.3 pts
33Washington County57.9-0.3 pts
34Rush County57.7-0.1 pts
35Montgomery County57.6-0 pts
36Shelby County57.6-0.5 pts
37Steuben County57.5-0.5 pts
38Kosciusko County57.5-0.2 pts
39Owen County57.5-0.2 pts
40DeKalb County57.4-0.2 pts
41Decatur County57.4-0.4 pts
42Elkhart County57.40 pts
43Lawrence County57.3-0.1 pts
44Newton County57.3-0.3 pts
45Huntington County57.2-0.5 pts
46Jackson County57.2-0.2 pts
47Vermillion County57.1-0.2 pts
48Jasper County57-0.4 pts
49Harrison County57-0.3 pts
50Noble County56.8-0.3 pts
51Wayne County56.8-0.1 pts
52Benton County56.8-0.2 pts
53Gibson County56.70 pts
54Greene County56.7-0.3 pts
55Howard County56.7-0.2 pts
56Switzerland County56.60 pts
57Clay County56.6-0.1 pts
58Warrick County56.6-0.3 pts
59Clinton County56.5+0.1 pts
60Carroll County56.5-0.2 pts
61Cass County56.4-0.1 pts
62Spencer County56.4-0.3 pts
63Pike County56.30 pts
64Dubois County56.2-0.4 pts
65Franklin County56.2-0.2 pts
66Whitley County56.2-0.7 pts
67Union County56.1-0.2 pts
68Crawford County56.1-1 pts
69Tipton County56.1-0.2 pts
70Fayette County56.1-0.2 pts
71Marshall County56-0.1 pts
72Ripley County55.9-0.1 pts
73Fountain County55.9-0.7 pts
74Ohio County55.8-0.8 pts
75Starke County55.7-0.5 pts
76Warren County55.7-0.2 pts
77Posey County55.7-0.4 pts
78Blackford County55.5-0.5 pts
79Randolph County55.1-0.3 pts
80Parke County55+0.4 pts
81Wells County55-0.4 pts
82Brown County54.9-0.8 pts
83Wabash County54.9-0.2 pts
84Pulaski County54.9-0.8 pts
85Martin County54.8-0.5 pts
86Fulton County54.8-0.4 pts
87Orange County54.7-0.5 pts
88Jay County54.5-0.3 pts
89White County54.1-0.3 pts
90Daviess County53.4-0.3 pts
91LaGrange County52.8-0 pts
92Adams County51.3-0.1 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, 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 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, 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-18-64/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 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, 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-18-64/indiana-counties?period=2024.

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, 2024 [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?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 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, 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-18-64/indiana-counties?period=2024. 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, 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-18-64/indiana-counties?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/indiana-counties?period=2024.
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 2024, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Adams County, with 51.3% 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 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