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 2020, at 68.9%. Adams County had the lowest, at 52.3%. The median was 58.2% and the figure for Indiana was 60%. Source: the U.S. Census Bureau.

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Highest68.9Monroe County
Lowest52.3Adams County
Median58.292 counties
Indiana60History

Map of counties, 2020

Adams County: 52.3 %Allen County: 59.1 %Bartholomew County: 59.1 %Benton County: 57.2 %Blackford County: 56.9 %Boone County: 58.8 %Brown County: 57.1 %Carroll County: 57.5 %Cass County: 57.3 %Clark County: 60.8 %Clay County: 57.9 %Clinton County: 56.7 %Crawford County: 57.7 %Daviess County: 54.7 %Dearborn County: 59.1 %Decatur County: 58.4 %DeKalb County: 58.4 %Delaware County: 62.5 %Dubois County: 57.9 %Elkhart County: 57.4 %Fayette County: 56.8 %Floyd County: 59.9 %Fountain County: 57.2 %Franklin County: 57.3 %Fulton County: 56 %Gibson County: 57.5 %Grant County: 59.1 %Greene County: 57.5 %Hamilton County: 59.7 %Hancock County: 58.9 %Harrison County: 58.7 %Hendricks County: 59.8 %Henry County: 59.9 %Howard County: 57.7 %Huntington County: 58.4 %Jackson County: 58.4 %Jasper County: 57.8 %Jay County: 55.6 %Jefferson County: 60.3 %Jennings County: 59.5 %Johnson County: 59.3 %Knox County: 58.8 %Kosciusko County: 58.7 %LaGrange County: 52.8 %Lake County: 59.5 %LaPorte County: 59.9 %Lawrence County: 57.7 %Madison County: 59.1 %Marion County: 62.8 %Marshall County: 56.4 %Martin County: 57.1 %Miami County: 61.1 %Monroe County: 68.9 %Montgomery County: 58.4 %Morgan County: 59.1 %Newton County: 58.4 %Noble County: 58 %Ohio County: 57.3 %Orange County: 56.5 %Owen County: 58.4 %Parke County: 57 %Perry County: 59.8 %Pike County: 57 %Porter County: 60.3 %Posey County: 57.7 %Pulaski County: 56.9 %Putnam County: 63 %Randolph County: 56 %Ripley County: 57 %Rush County: 58.4 %St. Joseph County: 60.3 %Scott County: 59.9 %Shelby County: 59.4 %Spencer County: 57.9 %Starke County: 57.6 %Steuben County: 59.1 %Sullivan County: 60.9 %Switzerland County: 57.7 %Tippecanoe County: 66.5 %Tipton County: 57 %Union County: 57.8 %Vanderburgh County: 60.3 %Vermillion County: 57.4 %Vigo County: 62.4 %Wabash County: 55.3 %Warren County: 56.7 %Warrick County: 57.5 %Washington County: 59.3 %Wayne County: 57.5 %Wells County: 56.4 %White County: 56.1 %Whitley County: 58.5 %
  • Under 57
  • 57 to 58
  • 58 to 59
  • 59 to 60
  • 60 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

Monroe County: 68.9 %Monroe County68.9Tippecanoe County: 66.5 %Tippecanoe County66.5Putnam County: 63 %Putnam County63Marion County: 62.8 %Marion County62.8Delaware County: 62.5 %Delaware County62.5Vigo County: 62.4 %Vigo County62.4Miami County: 61.1 %Miami County61.1Sullivan County: 60.9 %Sullivan County60.9Clark County: 60.8 %Clark County60.8Jefferson County: 60.3 %Jefferson County60.3St. Joseph County: 60.3 %St. Joseph County60.3Porter County: 60.3 %Porter County60.3Vanderburgh County: 60.3 %Vanderburgh County60.3LaPorte County: 59.9 %LaPorte County59.9Floyd County: 59.9 %Floyd County59.9Henry County: 59.9 %Henry County59.9Scott County: 59.9 %Scott County59.9Hendricks County: 59.8 %Hendricks County59.8Perry County: 59.8 %Perry County59.8Hamilton County: 59.7 %Hamilton County59.7Jennings County: 59.5 %Jennings County59.5Lake County: 59.5 %Lake County59.5Shelby County: 59.4 %Shelby County59.4Johnson County: 59.3 %Johnson County59.3Washington County: 59.3 %Washington County59.3Madison County: 59.1 %Madison County59.1Bartholomew County: 59.1 %Bartholomew County59.1Dearborn County: 59.1 %Dearborn County59.1Steuben County: 59.1 %Steuben County59.1Morgan County: 59.1 %Morgan County59.1Grant County: 59.1 %Grant County59.1Allen County: 59.1 %Allen County59.1Hancock County: 58.9 %Hancock County58.9Boone County: 58.8 %Boone County58.8Knox County: 58.8 %Knox County58.8Kosciusko County: 58.7 %Kosciusko County58.7Harrison County: 58.7 %Harrison County58.7Whitley County: 58.5 %Whitley County58.5Montgomery County: 58.4 %Montgomery County58.4Jackson County: 58.4 %Jackson County58.4Monroe County: 68.9 %Monroe County68.9Tippecanoe County: 66.5 %Tippecanoe County66.5Putnam County: 63 %Putnam County63Marion County: 62.8 %Marion County62.8Delaware County: 62.5 %Delaware County62.5Vigo County: 62.4 %Vigo County62.4Miami County: 61.1 %Miami County61.1Sullivan County: 60.9 %Sullivan County60.9Clark County: 60.8 %Clark County60.8Jefferson County: 60.3 %Jefferson County60.3St. Joseph County: 60.3 %St. Joseph County60.3Porter County: 60.3 %Porter County60.3Vanderburgh County: 60.3 %Vanderburgh County60.3LaPorte County: 59.9 %LaPorte County59.9Floyd County: 59.9 %Floyd County59.9Henry County: 59.9 %Henry County59.9Scott County: 59.9 %Scott County59.9Hendricks County: 59.8 %Hendricks County59.8Perry County: 59.8 %Perry County59.8Hamilton County: 59.7 %Hamilton County59.7Jennings County: 59.5 %Jennings County59.5Lake County: 59.5 %Lake County59.5Shelby County: 59.4 %Shelby County59.4Johnson County: 59.3 %Johnson County59.3Washington County: 59.3 %Washington County59.3Madison County: 59.1 %Madison County59.1Bartholomew County: 59.1 %Bartholomew County59.1Dearborn County: 59.1 %Dearborn County59.1Steuben County: 59.1 %Steuben County59.1Morgan County: 59.1 %Morgan County59.1Grant County: 59.1 %Grant County59.1Allen County: 59.1 %Allen County59.1Hancock County: 58.9 %Hancock County58.9Boone County: 58.8 %Boone County58.8Knox County: 58.8 %Knox County58.8Kosciusko County: 58.7 %Kosciusko County58.7Harrison County: 58.7 %Harrison County58.7Whitley County: 58.5 %Whitley County58.5Montgomery County: 58.4 %Montgomery County58.4Jackson County: 58.4 %Jackson County58.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Monroe County68.9-0.3 pts
2Tippecanoe County66.5-0.2 pts
3Putnam County63-0.4 pts
4Marion County62.8-0.4 pts
5Delaware County62.5-0.2 pts
6Vigo County62.4-0.3 pts
7Miami County61.1-0.2 pts
8Sullivan County60.9-0.4 pts
9Clark County60.8-0.2 pts
10Jefferson County60.3-0.4 pts
11St. Joseph County60.3-0.5 pts
12Porter County60.3-0.4 pts
13Vanderburgh County60.3-0.5 pts
14LaPorte County59.9-0.5 pts
15Floyd County59.9-0.5 pts
16Henry County59.9-0.3 pts
17Scott County59.9+0.1 pts
18Hendricks County59.8-0.1 pts
19Perry County59.8-0.7 pts
20Hamilton County59.7+0.1 pts
21Jennings County59.5-0.2 pts
22Lake County59.5-0.3 pts
23Shelby County59.4-0.5 pts
24Johnson County59.3-0.1 pts
25Washington County59.3-0.2 pts
26Madison County59.1-0.3 pts
27Bartholomew County59.1-0.4 pts
28Dearborn County59.1-0.5 pts
29Steuben County59.1-0.8 pts
30Morgan County59.1-0.5 pts
31Grant County59.1-0.5 pts
32Allen County59.1-0.3 pts
33Hancock County58.9-0.3 pts
34Boone County58.8-0.2 pts
35Knox County58.8-0.5 pts
36Kosciusko County58.7-0.5 pts
37Harrison County58.7-0.5 pts
38Whitley County58.5-0.5 pts
39Montgomery County58.4-0.5 pts
40Jackson County58.4-0.4 pts
41Huntington County58.4-0.8 pts
42Owen County58.4-0.2 pts
43Rush County58.4-0.2 pts
44DeKalb County58.4-0.6 pts
45Decatur County58.4-0.2 pts
46Newton County58.4-0.1 pts
47Noble County58-0.4 pts
48Dubois County57.9-0.5 pts
49Spencer County57.9-0.5 pts
50Clay County57.9-0.8 pts
51Union County57.8-0.2 pts
52Jasper County57.8-0.3 pts
53Crawford County57.7-0.3 pts
54Lawrence County57.7-0.3 pts
55Howard County57.7-0.3 pts
56Posey County57.7-0.6 pts
57Switzerland County57.7+0.1 pts
58Starke County57.6-0.6 pts
59Gibson County57.5-0.5 pts
60Wayne County57.5-0.5 pts
61Warrick County57.5-0 pts
62Carroll County57.5+0.1 pts
63Greene County57.5-0.7 pts
64Elkhart County57.4-0.4 pts
65Vermillion County57.4-0.4 pts
66Franklin County57.3-0.4 pts
67Cass County57.3-0.3 pts
68Ohio County57.3-0.3 pts
69Fountain County57.2-0.4 pts
70Benton County57.2+0.7 pts
71Brown County57.10 pts
72Martin County57.1-0.2 pts
73Parke County57-0.4 pts
74Tipton County57-0.7 pts
75Pike County57-0.3 pts
76Ripley County57-0.6 pts
77Pulaski County56.9-0.5 pts
78Blackford County56.90 pts
79Fayette County56.8-0.6 pts
80Clinton County56.7-0.4 pts
81Warren County56.7-0.2 pts
82Orange County56.5-0.5 pts
83Marshall County56.4-0.4 pts
84Wells County56.4-0.6 pts
85White County56.1-0.4 pts
86Randolph County56-0.3 pts
87Fulton County56-0.6 pts
88Jay County55.6-0.3 pts
89Wabash County55.3-0.6 pts
90Daviess County54.7-0.3 pts
91LaGrange County52.8-0 pts
92Adams County52.3-0.5 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, 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 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, 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-18-64/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 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, 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-18-64/indiana-counties?period=2020.

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, 2020 [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=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 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, 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-18-64/indiana-counties?period=2020. 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, 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-18-64/indiana-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/indiana-counties?period=2020.
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 2020, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Adams County, with 52.3% 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 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