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

Counties in Maine by population aged 18 to 64

Penobscot County had the highest population aged 18 to 64 of 16 counties in 2021, at 61.7%. Lincoln County had the lowest, at 53.4%. The median was 57.7% and the figure for Maine was 59.3%. Source: the U.S. Census Bureau.

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Highest61.7Penobscot County
Lowest53.4Lincoln County
Median57.716 counties
Maine59.3History

Map of counties, 2021

Androscoggin County: 60.6 %Aroostook County: 55.1 %Cumberland County: 61.5 %Franklin County: 58.1 %Hancock County: 56.5 %Kennebec County: 59.8 %Knox County: 55.6 %Lincoln County: 53.4 %Oxford County: 57.7 %Penobscot County: 61.7 %Piscataquis County: 54.3 %Sagadahoc County: 57.7 %Somerset County: 58.3 %Waldo County: 56.6 %Washington County: 54.8 %York County: 60 %
  • Under 55
  • 55 to 57
  • 57 to 58
  • 58 to 60
  • 60 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Penobscot County: 61.7 %Penobscot County61.7Cumberland County: 61.5 %Cumberland County61.5Androscoggin County: 60.6 %Androscoggin County60.6York County: 60 %York County60Kennebec County: 59.8 %Kennebec County59.8Somerset County: 58.3 %Somerset County58.3Franklin County: 58.1 %Franklin County58.1Oxford County: 57.7 %Oxford County57.7Sagadahoc County: 57.7 %Sagadahoc County57.7Waldo County: 56.6 %Waldo County56.6Hancock County: 56.5 %Hancock County56.5Knox County: 55.6 %Knox County55.6Aroostook County: 55.1 %Aroostook County55.1Washington County: 54.8 %Washington County54.8Piscataquis County: 54.3 %Piscataquis County54.3Lincoln County: 53.4 %Lincoln County53.4Penobscot County: 61.7 %Penobscot County61.7Cumberland County: 61.5 %Cumberland County61.5Androscoggin County: 60.6 %Androscoggin County60.6York County: 60 %York County60Kennebec County: 59.8 %Kennebec County59.8Somerset County: 58.3 %Somerset County58.3Franklin County: 58.1 %Franklin County58.1Oxford County: 57.7 %Oxford County57.7Sagadahoc County: 57.7 %Sagadahoc County57.7Waldo County: 56.6 %Waldo County56.6Hancock County: 56.5 %Hancock County56.5Knox County: 55.6 %Knox County55.6Aroostook County: 55.1 %Aroostook County55.1Washington County: 54.8 %Washington County54.8Piscataquis County: 54.3 %Piscataquis County54.3Lincoln County: 53.4 %Lincoln County53.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Penobscot County61.7-0.3 pts
2Cumberland County61.5-0.3 pts
3Androscoggin County60.6+0.4 pts
4York County60-0.2 pts
5Kennebec County59.8-0.3 pts
6Somerset County58.3-0.4 pts
7Franklin County58.1+0.2 pts
8Oxford County57.7-0.1 pts
9Sagadahoc County57.7-0.1 pts
10Waldo County56.6-0.5 pts
11Hancock County56.5-0.1 pts
12Knox County55.6-0.4 pts
13Aroostook County55.1-0.5 pts
14Washington County54.8-0.4 pts
15Piscataquis County54.3-0.2 pts
16Lincoln County53.4-0.3 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 Maine by population aged 18 to 64, 2021) [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 Maine by population aged 18 to 64, 2021. 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/maine-counties?period=2021. 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 Maine by population aged 18 to 64, 2021. 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/maine-counties?period=2021.

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 Maine by population aged 18 to 64, 2021 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/maine-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2021,
  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 Maine by population aged 18 to 64, 2021}},
  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/maine-counties?period=2021. 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 Maine by population aged 18 to 64, 2021
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/maine-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/maine-counties?period=2021.
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?

Penobscot County, with 61.7% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Lincoln County, with 53.4% in 2021.

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 Maine: more rankings