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 2018, at 69.8%. LaGrange County had the lowest, at 53.1%. The median was 58.9% and the figure for Indiana was 60.6%. Source: the U.S. Census Bureau.

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Highest69.8Monroe County
Lowest53.1LaGrange County
Median58.992 counties
Indiana60.6History

Map of counties, 2018

Adams County: 53.2 %Allen County: 59.6 %Bartholomew County: 59.8 %Benton County: 57 %Blackford County: 57 %Boone County: 59.3 %Brown County: 57.6 %Carroll County: 57.6 %Cass County: 57.7 %Clark County: 61.2 %Clay County: 58.9 %Clinton County: 57.3 %Crawford County: 58.8 %Daviess County: 55.2 %Dearborn County: 59.8 %Decatur County: 58.7 %DeKalb County: 59.3 %Delaware County: 63 %Dubois County: 58.8 %Elkhart County: 57.9 %Fayette County: 57.6 %Floyd County: 60.8 %Fountain County: 57.7 %Franklin County: 58.1 %Fulton County: 57 %Gibson County: 58.5 %Grant County: 59.9 %Greene County: 58.2 %Hamilton County: 59.8 %Hancock County: 59.4 %Harrison County: 59.5 %Hendricks County: 60.1 %Henry County: 60.5 %Howard County: 58.4 %Huntington County: 59.8 %Jackson County: 59 %Jasper County: 58.5 %Jay County: 56.2 %Jefferson County: 61 %Jennings County: 60.2 %Johnson County: 59.7 %Knox County: 59.6 %Kosciusko County: 59.4 %LaGrange County: 53.1 %Lake County: 60.1 %LaPorte County: 60.8 %Lawrence County: 58.2 %Madison County: 59.6 %Marion County: 63.4 %Marshall County: 57.1 %Martin County: 57.7 %Miami County: 61.6 %Monroe County: 69.8 %Montgomery County: 59.1 %Morgan County: 60 %Newton County: 58.9 %Noble County: 58.7 %Ohio County: 58.6 %Orange County: 57.3 %Owen County: 59 %Parke County: 57.9 %Perry County: 60.5 %Pike County: 57.6 %Porter County: 61 %Posey County: 58.8 %Pulaski County: 57.7 %Putnam County: 63.4 %Randolph County: 56.5 %Ripley County: 57.9 %Rush County: 59 %St. Joseph County: 61 %Scott County: 60.1 %Shelby County: 60.1 %Spencer County: 58.5 %Starke County: 58.4 %Steuben County: 60.2 %Sullivan County: 61.5 %Switzerland County: 57.7 %Tippecanoe County: 67.1 %Tipton County: 58 %Union County: 59 %Vanderburgh County: 61.3 %Vermillion County: 58.1 %Vigo County: 63.1 %Wabash County: 56.4 %Warren County: 57.2 %Warrick County: 57.6 %Washington County: 60.1 %Wayne County: 58.4 %Wells County: 57.2 %White County: 56.6 %Whitley County: 59 %
  • Under 58
  • 58 to 59
  • 59 to 60
  • 60 to 61
  • 61 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

Monroe County: 69.8 %Monroe County69.8Tippecanoe County: 67.1 %Tippecanoe County67.1Marion County: 63.4 %Marion County63.4Putnam County: 63.4 %Putnam County63.4Vigo County: 63.1 %Vigo County63.1Delaware County: 63 %Delaware County63Miami County: 61.6 %Miami County61.6Sullivan County: 61.5 %Sullivan County61.5Vanderburgh County: 61.3 %Vanderburgh County61.3Clark County: 61.2 %Clark County61.2Jefferson County: 61 %Jefferson County61St. Joseph County: 61 %St. Joseph County61Porter County: 61 %Porter County61Floyd County: 60.8 %Floyd County60.8LaPorte County: 60.8 %LaPorte County60.8Perry County: 60.5 %Perry County60.5Henry County: 60.5 %Henry County60.5Jennings County: 60.2 %Jennings County60.2Steuben County: 60.2 %Steuben County60.2Hendricks County: 60.1 %Hendricks County60.1Washington County: 60.1 %Washington County60.1Scott County: 60.1 %Scott County60.1Shelby County: 60.1 %Shelby County60.1Lake County: 60.1 %Lake County60.1Morgan County: 60 %Morgan County60Grant County: 59.9 %Grant County59.9Huntington County: 59.8 %Huntington County59.8Dearborn County: 59.8 %Dearborn County59.8Bartholomew County: 59.8 %Bartholomew County59.8Hamilton County: 59.8 %Hamilton County59.8Johnson County: 59.7 %Johnson County59.7Madison County: 59.6 %Madison County59.6Knox County: 59.6 %Knox County59.6Allen County: 59.6 %Allen County59.6Harrison County: 59.5 %Harrison County59.5Kosciusko County: 59.4 %Kosciusko County59.4Hancock County: 59.4 %Hancock County59.4Boone County: 59.3 %Boone County59.3DeKalb County: 59.3 %DeKalb County59.3Montgomery County: 59.1 %Montgomery County59.1Monroe County: 69.8 %Monroe County69.8Tippecanoe County: 67.1 %Tippecanoe County67.1Marion County: 63.4 %Marion County63.4Putnam County: 63.4 %Putnam County63.4Vigo County: 63.1 %Vigo County63.1Delaware County: 63 %Delaware County63Miami County: 61.6 %Miami County61.6Sullivan County: 61.5 %Sullivan County61.5Vanderburgh County: 61.3 %Vanderburgh County61.3Clark County: 61.2 %Clark County61.2Jefferson County: 61 %Jefferson County61St. Joseph County: 61 %St. Joseph County61Porter County: 61 %Porter County61Floyd County: 60.8 %Floyd County60.8LaPorte County: 60.8 %LaPorte County60.8Perry County: 60.5 %Perry County60.5Henry County: 60.5 %Henry County60.5Jennings County: 60.2 %Jennings County60.2Steuben County: 60.2 %Steuben County60.2Hendricks County: 60.1 %Hendricks County60.1Washington County: 60.1 %Washington County60.1Scott County: 60.1 %Scott County60.1Shelby County: 60.1 %Shelby County60.1Lake County: 60.1 %Lake County60.1Morgan County: 60 %Morgan County60Grant County: 59.9 %Grant County59.9Huntington County: 59.8 %Huntington County59.8Dearborn County: 59.8 %Dearborn County59.8Bartholomew County: 59.8 %Bartholomew County59.8Hamilton County: 59.8 %Hamilton County59.8Johnson County: 59.7 %Johnson County59.7Madison County: 59.6 %Madison County59.6Knox County: 59.6 %Knox County59.6Allen County: 59.6 %Allen County59.6Harrison County: 59.5 %Harrison County59.5Kosciusko County: 59.4 %Kosciusko County59.4Hancock County: 59.4 %Hancock County59.4Boone County: 59.3 %Boone County59.3DeKalb County: 59.3 %DeKalb County59.3Montgomery County: 59.1 %Montgomery County59.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Monroe County69.8-0.7 pts
2Tippecanoe County67.1-0.3 pts
3Marion County63.4-0.1 pts
4Putnam County63.4-0 pts
5Vigo County63.1-0.2 pts
6Delaware County63-0.4 pts
7Miami County61.6+0.1 pts
8Sullivan County61.5-0.3 pts
9Vanderburgh County61.3-0.4 pts
10Clark County61.2-0.2 pts
11Jefferson County61-0.2 pts
12St. Joseph County61-0.2 pts
13Porter County61-0.3 pts
14Floyd County60.8-0.3 pts
15LaPorte County60.8-0.2 pts
16Perry County60.5-0.1 pts
17Henry County60.5-0.1 pts
18Jennings County60.2-0.3 pts
19Steuben County60.2-0.3 pts
20Hendricks County60.1-0.1 pts
21Washington County60.1-0.1 pts
22Scott County60.1-0.3 pts
23Shelby County60.1-0.2 pts
24Lake County60.1-0.2 pts
25Morgan County60-0.3 pts
26Grant County59.9-0.3 pts
27Huntington County59.8-0.5 pts
28Dearborn County59.8-0.2 pts
29Bartholomew County59.8-0.3 pts
30Hamilton County59.8-0.2 pts
31Johnson County59.7-0.2 pts
32Madison County59.6-0.1 pts
33Knox County59.6-0.6 pts
34Allen County59.6-0.2 pts
35Harrison County59.5-0.3 pts
36Kosciusko County59.4-0.1 pts
37Hancock County59.4-0.4 pts
38Boone County59.3-0.1 pts
39DeKalb County59.3-0.3 pts
40Montgomery County59.1-0.3 pts
41Rush County59-0.2 pts
42Whitley County59-0.6 pts
43Jackson County59-0.2 pts
44Owen County59-0.3 pts
45Union County59-0.1 pts
46Clay County58.9-0.5 pts
47Newton County58.9-0 pts
48Posey County58.8-0.6 pts
49Crawford County58.8-0.4 pts
50Dubois County58.8-0.3 pts
51Noble County58.7-0.3 pts
52Decatur County58.7-0.1 pts
53Ohio County58.6-0.9 pts
54Jasper County58.5-0.1 pts
55Gibson County58.5-0.4 pts
56Spencer County58.5-0.3 pts
57Wayne County58.4-0.3 pts
58Howard County58.4-0.2 pts
59Starke County58.4-0.6 pts
60Greene County58.2-0.3 pts
61Lawrence County58.2-0.2 pts
62Vermillion County58.10 pts
63Franklin County58.1-0.7 pts
64Tipton County58-0.1 pts
65Elkhart County57.9-0.1 pts
66Ripley County57.9-0.1 pts
67Parke County57.9-0.5 pts
68Pulaski County57.7-0.6 pts
69Fountain County57.7-0.1 pts
70Cass County57.7-0.3 pts
71Switzerland County57.7-0.1 pts
72Martin County57.7-0.4 pts
73Pike County57.6-0.5 pts
74Brown County57.6-0.3 pts
75Fayette County57.6-0.4 pts
76Carroll County57.6-0.3 pts
77Warrick County57.6-0.2 pts
78Orange County57.3-0.4 pts
79Clinton County57.3-0.2 pts
80Warren County57.2-0.6 pts
81Wells County57.2-0.3 pts
82Marshall County57.1-0.6 pts
83Benton County57-0.1 pts
84Fulton County57-0.1 pts
85Blackford County57-0.5 pts
86White County56.6-0.1 pts
87Randolph County56.5-0.1 pts
88Wabash County56.4-0.5 pts
89Jay County56.2-0.2 pts
90Daviess County55.2-0.2 pts
91Adams County53.2-0.3 pts
92LaGrange County53.10 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, 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 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, 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-18-64/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 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, 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-18-64/indiana-counties?period=2018.

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, 2018 [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=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 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, 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-18-64/indiana-counties?period=2018. 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, 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-18-64/indiana-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/indiana-counties?period=2018.
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 69.8% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

LaGrange County, with 53.1% 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 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