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 2023, at 68.9%. Adams County had the lowest, at 51.3%. The median was 57.4% and the figure for Indiana was 59.3%. Source: the U.S. Census Bureau.

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Highest68.9Monroe County
Lowest51.3Adams County
Median57.492 counties
Indiana59.3History

Map of counties, 2023

Adams County: 51.3 %Allen County: 58.5 %Bartholomew County: 58.8 %Benton County: 57 %Blackford County: 55.9 %Boone County: 58.3 %Brown County: 55.8 %Carroll County: 56.6 %Cass County: 56.5 %Clark County: 60.3 %Clay County: 56.7 %Clinton County: 56.4 %Crawford County: 57.1 %Daviess County: 53.7 %Dearborn County: 58.2 %Decatur County: 57.8 %DeKalb County: 57.7 %Delaware County: 62 %Dubois County: 56.6 %Elkhart County: 57.4 %Fayette County: 56.2 %Floyd County: 59.2 %Fountain County: 56.6 %Franklin County: 56.4 %Fulton County: 55.2 %Gibson County: 56.7 %Grant County: 58.5 %Greene County: 57 %Hamilton County: 59.8 %Hancock County: 58.5 %Harrison County: 57.3 %Hendricks County: 59.1 %Henry County: 59.2 %Howard County: 56.8 %Huntington County: 57.7 %Jackson County: 57.4 %Jasper County: 57.5 %Jay County: 54.8 %Jefferson County: 59.1 %Jennings County: 58.9 %Johnson County: 59 %Knox County: 58.1 %Kosciusko County: 57.7 %LaGrange County: 52.8 %Lake County: 58.8 %LaPorte County: 58.8 %Lawrence County: 57.4 %Madison County: 58.8 %Marion County: 62 %Marshall County: 56.1 %Martin County: 55.3 %Miami County: 59.1 %Monroe County: 68.9 %Montgomery County: 57.7 %Morgan County: 58.4 %Newton County: 57.6 %Noble County: 57.1 %Ohio County: 56.6 %Orange County: 55.2 %Owen County: 57.6 %Parke County: 54.6 %Perry County: 59.1 %Pike County: 56.3 %Porter County: 59.5 %Posey County: 56 %Pulaski County: 55.7 %Putnam County: 61.7 %Randolph County: 55.4 %Ripley County: 56.1 %Rush County: 57.8 %St. Joseph County: 59.6 %Scott County: 59.7 %Shelby County: 58.1 %Spencer County: 56.7 %Starke County: 56.3 %Steuben County: 58 %Sullivan County: 59.5 %Switzerland County: 56.6 %Tippecanoe County: 66.2 %Tipton County: 56.3 %Union County: 56.3 %Vanderburgh County: 59.5 %Vermillion County: 57.2 %Vigo County: 61.4 %Wabash County: 55.1 %Warren County: 55.9 %Warrick County: 56.9 %Washington County: 58.1 %Wayne County: 56.8 %Wells County: 55.4 %White County: 54.4 %Whitley County: 56.8 %
  • Under 56
  • 56 to 57
  • 57 to 58
  • 58 to 59
  • 59 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

Monroe County: 68.9 %Monroe County68.9Tippecanoe County: 66.2 %Tippecanoe County66.2Delaware County: 62 %Delaware County62Marion County: 62 %Marion County62Putnam County: 61.7 %Putnam County61.7Vigo County: 61.4 %Vigo County61.4Clark County: 60.3 %Clark County60.3Hamilton County: 59.8 %Hamilton County59.8Scott County: 59.7 %Scott County59.7St. Joseph County: 59.6 %St. Joseph County59.6Sullivan County: 59.5 %Sullivan County59.5Porter County: 59.5 %Porter County59.5Vanderburgh County: 59.5 %Vanderburgh County59.5Floyd County: 59.2 %Floyd County59.2Henry County: 59.2 %Henry County59.2Perry County: 59.1 %Perry County59.1Miami County: 59.1 %Miami County59.1Hendricks County: 59.1 %Hendricks County59.1Jefferson County: 59.1 %Jefferson County59.1Johnson County: 59 %Johnson County59Jennings County: 58.9 %Jennings County58.9LaPorte County: 58.8 %LaPorte County58.8Madison County: 58.8 %Madison County58.8Bartholomew County: 58.8 %Bartholomew County58.8Lake County: 58.8 %Lake County58.8Grant County: 58.5 %Grant County58.5Hancock County: 58.5 %Hancock County58.5Allen County: 58.5 %Allen County58.5Morgan County: 58.4 %Morgan County58.4Boone County: 58.3 %Boone County58.3Dearborn County: 58.2 %Dearborn County58.2Washington County: 58.1 %Washington County58.1Knox County: 58.1 %Knox County58.1Shelby County: 58.1 %Shelby County58.1Steuben County: 58 %Steuben County58Rush County: 57.8 %Rush County57.8Decatur County: 57.8 %Decatur County57.8Huntington County: 57.7 %Huntington County57.7DeKalb County: 57.7 %DeKalb County57.7Kosciusko County: 57.7 %Kosciusko County57.7Monroe County: 68.9 %Monroe County68.9Tippecanoe County: 66.2 %Tippecanoe County66.2Delaware County: 62 %Delaware County62Marion County: 62 %Marion County62Putnam County: 61.7 %Putnam County61.7Vigo County: 61.4 %Vigo County61.4Clark County: 60.3 %Clark County60.3Hamilton County: 59.8 %Hamilton County59.8Scott County: 59.7 %Scott County59.7St. Joseph County: 59.6 %St. Joseph County59.6Sullivan County: 59.5 %Sullivan County59.5Porter County: 59.5 %Porter County59.5Vanderburgh County: 59.5 %Vanderburgh County59.5Floyd County: 59.2 %Floyd County59.2Henry County: 59.2 %Henry County59.2Perry County: 59.1 %Perry County59.1Miami County: 59.1 %Miami County59.1Hendricks County: 59.1 %Hendricks County59.1Jefferson County: 59.1 %Jefferson County59.1Johnson County: 59 %Johnson County59Jennings County: 58.9 %Jennings County58.9LaPorte County: 58.8 %LaPorte County58.8Madison County: 58.8 %Madison County58.8Bartholomew County: 58.8 %Bartholomew County58.8Lake County: 58.8 %Lake County58.8Grant County: 58.5 %Grant County58.5Hancock County: 58.5 %Hancock County58.5Allen County: 58.5 %Allen County58.5Morgan County: 58.4 %Morgan County58.4Boone County: 58.3 %Boone County58.3Dearborn County: 58.2 %Dearborn County58.2Washington County: 58.1 %Washington County58.1Knox County: 58.1 %Knox County58.1Shelby County: 58.1 %Shelby County58.1Steuben County: 58 %Steuben County58Rush County: 57.8 %Rush County57.8Decatur County: 57.8 %Decatur County57.8Huntington County: 57.7 %Huntington County57.7DeKalb County: 57.7 %DeKalb County57.7Kosciusko County: 57.7 %Kosciusko County57.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Monroe County68.9-0.4 pts
2Tippecanoe County66.2-0.1 pts
3Delaware County62-0.3 pts
4Marion County62-0.3 pts
5Putnam County61.7-0.6 pts
6Vigo County61.4-0.4 pts
7Clark County60.3-0.2 pts
8Hamilton County59.8-0 pts
9Scott County59.7-0.2 pts
10St. Joseph County59.6-0.2 pts
11Sullivan County59.5-0.8 pts
12Porter County59.5-0.3 pts
13Vanderburgh County59.5-0.3 pts
14Floyd County59.2-0.2 pts
15Henry County59.2-0.2 pts
16Perry County59.1+0.2 pts
17Miami County59.1-0.3 pts
18Hendricks County59.1-0.3 pts
19Jefferson County59.1-0.3 pts
20Johnson County59-0.1 pts
21Jennings County58.9-0.3 pts
22LaPorte County58.8-0.4 pts
23Madison County58.8-0.1 pts
24Bartholomew County58.8-0 pts
25Lake County58.8-0.2 pts
26Grant County58.5-0.2 pts
27Hancock County58.5-0.1 pts
28Allen County58.5-0.2 pts
29Morgan County58.4-0.1 pts
30Boone County58.3-0.1 pts
31Dearborn County58.2-0.3 pts
32Washington County58.1-0.3 pts
33Knox County58.1-0.3 pts
34Shelby County58.1-0.5 pts
35Steuben County58-0.6 pts
36Rush County57.8-0 pts
37Decatur County57.8-0.3 pts
38Huntington County57.7-0.3 pts
39DeKalb County57.7-0.1 pts
39Kosciusko County57.7-0.4 pts
41Montgomery County57.7-0.4 pts
42Owen County57.6-0.3 pts
43Newton County57.6-0.3 pts
44Jasper County57.5-0.1 pts
45Lawrence County57.40 pts
46Jackson County57.4-0.5 pts
47Elkhart County57.4-0 pts
48Harrison County57.3-0.6 pts
49Vermillion County57.20 pts
50Noble County57.1-0.2 pts
51Crawford County57.1-0.3 pts
52Greene County57-0.2 pts
53Benton County57-0.4 pts
54Warrick County56.9-0.3 pts
55Wayne County56.8-0.2 pts
56Howard County56.8-0.4 pts
57Whitley County56.8-0.6 pts
58Clay County56.7-0.3 pts
59Gibson County56.7-0.4 pts
60Spencer County56.7-0.5 pts
61Carroll County56.6-0.4 pts
62Switzerland County56.6-0.7 pts
63Fountain County56.6-0.4 pts
63Ohio County56.6-0.1 pts
65Dubois County56.6-0.5 pts
66Cass County56.5-0 pts
67Franklin County56.4-0.4 pts
68Clinton County56.4-0.3 pts
69Union County56.3-0.2 pts
70Starke County56.3-0.5 pts
70Tipton County56.3-0.3 pts
72Pike County56.3-0.3 pts
73Fayette County56.2-0.3 pts
74Ripley County56.1-0.5 pts
75Marshall County56.1-0.1 pts
76Posey County56-0.5 pts
77Warren County55.9-0.5 pts
78Blackford County55.9-0.3 pts
79Brown County55.8-0.5 pts
80Pulaski County55.7-0.5 pts
81Wells County55.4-0.3 pts
82Randolph County55.4-0.3 pts
83Martin County55.3-0.4 pts
84Fulton County55.2-0.3 pts
84Orange County55.2-0.7 pts
86Wabash County55.1-0.2 pts
87Jay County54.8-0.3 pts
88Parke County54.6-1.1 pts
89White County54.4-0.5 pts
90Daviess County53.7-0.4 pts
91LaGrange County52.8-0.2 pts
92Adams County51.3-0.5 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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_indiana_by_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/indiana-counties?period=2023.
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 68.9% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Adams County, with 51.3% in 2023.

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