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 2020, at 61.9%. Lincoln County had the lowest, at 53.8%. The median was 57.8% and the figure for Maine was 59.5%. Source: the U.S. Census Bureau.

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Highest61.9Penobscot County
Lowest53.8Lincoln County
Median57.816 counties
Maine59.5History

Map of counties, 2020

Androscoggin County: 60.2 %Aroostook County: 55.5 %Cumberland County: 61.8 %Franklin County: 57.9 %Hancock County: 56.6 %Kennebec County: 60.1 %Knox County: 55.9 %Lincoln County: 53.8 %Oxford County: 57.8 %Penobscot County: 61.9 %Piscataquis County: 54.5 %Sagadahoc County: 57.8 %Somerset County: 58.7 %Waldo County: 57.2 %Washington County: 55.2 %York County: 60.3 %
  • Under 56
  • 56 to 57
  • 57 to 58
  • 58 to 60
  • 60 and over
%, 2020. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2020

Penobscot County: 61.9 %Penobscot County61.9Cumberland County: 61.8 %Cumberland County61.8York County: 60.3 %York County60.3Androscoggin County: 60.2 %Androscoggin County60.2Kennebec County: 60.1 %Kennebec County60.1Somerset County: 58.7 %Somerset County58.7Franklin County: 57.9 %Franklin County57.9Oxford County: 57.8 %Oxford County57.8Sagadahoc County: 57.8 %Sagadahoc County57.8Waldo County: 57.2 %Waldo County57.2Hancock County: 56.6 %Hancock County56.6Knox County: 55.9 %Knox County55.9Aroostook County: 55.5 %Aroostook County55.5Washington County: 55.2 %Washington County55.2Piscataquis County: 54.5 %Piscataquis County54.5Lincoln County: 53.8 %Lincoln County53.8Penobscot County: 61.9 %Penobscot County61.9Cumberland County: 61.8 %Cumberland County61.8York County: 60.3 %York County60.3Androscoggin County: 60.2 %Androscoggin County60.2Kennebec County: 60.1 %Kennebec County60.1Somerset County: 58.7 %Somerset County58.7Franklin County: 57.9 %Franklin County57.9Oxford County: 57.8 %Oxford County57.8Sagadahoc County: 57.8 %Sagadahoc County57.8Waldo County: 57.2 %Waldo County57.2Hancock County: 56.6 %Hancock County56.6Knox County: 55.9 %Knox County55.9Aroostook County: 55.5 %Aroostook County55.5Washington County: 55.2 %Washington County55.2Piscataquis County: 54.5 %Piscataquis County54.5Lincoln County: 53.8 %Lincoln County53.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Penobscot County61.9-0.5 pts
2Cumberland County61.8-0.4 pts
3York County60.3-0.4 pts
4Androscoggin County60.2-0.3 pts
5Kennebec County60.1-0.2 pts
6Somerset County58.7-0.7 pts
7Franklin County57.9-0.6 pts
8Oxford County57.8-0.6 pts
9Sagadahoc County57.8-0.4 pts
10Waldo County57.2-0.7 pts
11Hancock County56.6-0.8 pts
12Knox County55.9-0.7 pts
13Aroostook County55.5-0.6 pts
14Washington County55.2-1 pts
15Piscataquis County54.5-1.2 pts
16Lincoln County53.8-1 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 Maine 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 Maine 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/maine-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 Maine 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/maine-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 Maine 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/maine-counties?period=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_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 Maine 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/maine-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 Maine 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/maine-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/maine-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?

Penobscot County, with 61.9% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Lincoln County, with 53.8% 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 Maine: more rankings