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 2023, at 61.5%. Lincoln County had the lowest, at 52.9%. The median was 56.7% and the figure for Maine was 58.7%. Source: the U.S. Census Bureau.

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Highest61.5Penobscot County
Lowest52.9Lincoln County
Median56.716 counties
Maine58.7History

Map of counties, 2023

Androscoggin County: 60.2 %Aroostook County: 54.5 %Cumberland County: 60.8 %Franklin County: 58.6 %Hancock County: 55.6 %Kennebec County: 59.5 %Knox County: 54.4 %Lincoln County: 52.9 %Oxford County: 56.8 %Penobscot County: 61.5 %Piscataquis County: 53.6 %Sagadahoc County: 56.6 %Somerset County: 57.6 %Waldo County: 55.8 %Washington County: 54.1 %York County: 59.1 %
  • Under 54
  • 54 to 56
  • 56 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.

All counties, 2023

Penobscot County: 61.5 %Penobscot County61.5Cumberland County: 60.8 %Cumberland County60.8Androscoggin County: 60.2 %Androscoggin County60.2Kennebec County: 59.5 %Kennebec County59.5York County: 59.1 %York County59.1Franklin County: 58.6 %Franklin County58.6Somerset County: 57.6 %Somerset County57.6Oxford County: 56.8 %Oxford County56.8Sagadahoc County: 56.6 %Sagadahoc County56.6Waldo County: 55.8 %Waldo County55.8Hancock County: 55.6 %Hancock County55.6Aroostook County: 54.5 %Aroostook County54.5Knox County: 54.4 %Knox County54.4Washington County: 54.1 %Washington County54.1Piscataquis County: 53.6 %Piscataquis County53.6Lincoln County: 52.9 %Lincoln County52.9Penobscot County: 61.5 %Penobscot County61.5Cumberland County: 60.8 %Cumberland County60.8Androscoggin County: 60.2 %Androscoggin County60.2Kennebec County: 59.5 %Kennebec County59.5York County: 59.1 %York County59.1Franklin County: 58.6 %Franklin County58.6Somerset County: 57.6 %Somerset County57.6Oxford County: 56.8 %Oxford County56.8Sagadahoc County: 56.6 %Sagadahoc County56.6Waldo County: 55.8 %Waldo County55.8Hancock County: 55.6 %Hancock County55.6Aroostook County: 54.5 %Aroostook County54.5Knox County: 54.4 %Knox County54.4Washington County: 54.1 %Washington County54.1Piscataquis County: 53.6 %Piscataquis County53.6Lincoln County: 52.9 %Lincoln County52.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Penobscot County61.5-0 pts
2Cumberland County60.8-0.4 pts
3Androscoggin County60.2-0.2 pts
4Kennebec County59.5-0.2 pts
5York County59.1-0.5 pts
6Franklin County58.6+0.3 pts
7Somerset County57.6-0.3 pts
8Oxford County56.8-0.5 pts
9Sagadahoc County56.6-0.5 pts
10Waldo County55.8-0.4 pts
11Hancock County55.6-0.2 pts
12Aroostook County54.5-0.3 pts
13Knox County54.4-0.5 pts
14Washington County54.1-0.4 pts
15Piscataquis County53.6-0.2 pts
16Lincoln County52.9-0.3 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, 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 Maine 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/maine-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 Maine 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/maine-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 Maine 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/maine-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_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 Maine 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/maine-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 Maine 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/maine-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/maine-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?

Penobscot County, with 61.5% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Lincoln County, with 52.9% 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 Maine: more rankings