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 2018, at 62.8%. Lincoln County had the lowest, at 55.5%. The median was 58.7% and the figure for Maine was 60.5%. Source: the U.S. Census Bureau.

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Highest62.8Penobscot County
Lowest55.5Lincoln County
Median58.716 counties
Maine60.5History

Map of counties, 2018

Androscoggin County: 60.9 %Aroostook County: 57 %Cumberland County: 62.6 %Franklin County: 59.3 %Hancock County: 58 %Kennebec County: 60.7 %Knox County: 57.3 %Lincoln County: 55.5 %Oxford County: 58.8 %Penobscot County: 62.8 %Piscataquis County: 56.4 %Sagadahoc County: 58.6 %Somerset County: 59.7 %Waldo County: 58.5 %Washington County: 56.6 %York County: 61.1 %
  • Under 57
  • 57 to 58
  • 58 to 59
  • 59 to 61
  • 61 and over
%, 2018. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2018

Penobscot County: 62.8 %Penobscot County62.8Cumberland County: 62.6 %Cumberland County62.6York County: 61.1 %York County61.1Androscoggin County: 60.9 %Androscoggin County60.9Kennebec County: 60.7 %Kennebec County60.7Somerset County: 59.7 %Somerset County59.7Franklin County: 59.3 %Franklin County59.3Oxford County: 58.8 %Oxford County58.8Sagadahoc County: 58.6 %Sagadahoc County58.6Waldo County: 58.5 %Waldo County58.5Hancock County: 58 %Hancock County58Knox County: 57.3 %Knox County57.3Aroostook County: 57 %Aroostook County57Washington County: 56.6 %Washington County56.6Piscataquis County: 56.4 %Piscataquis County56.4Lincoln County: 55.5 %Lincoln County55.5Penobscot County: 62.8 %Penobscot County62.8Cumberland County: 62.6 %Cumberland County62.6York County: 61.1 %York County61.1Androscoggin County: 60.9 %Androscoggin County60.9Kennebec County: 60.7 %Kennebec County60.7Somerset County: 59.7 %Somerset County59.7Franklin County: 59.3 %Franklin County59.3Oxford County: 58.8 %Oxford County58.8Sagadahoc County: 58.6 %Sagadahoc County58.6Waldo County: 58.5 %Waldo County58.5Hancock County: 58 %Hancock County58Knox County: 57.3 %Knox County57.3Aroostook County: 57 %Aroostook County57Washington County: 56.6 %Washington County56.6Piscataquis County: 56.4 %Piscataquis County56.4Lincoln County: 55.5 %Lincoln County55.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Penobscot County62.8-0.4 pts
2Cumberland County62.6-0.4 pts
3York County61.1-0.4 pts
4Androscoggin County60.9-0.1 pts
5Kennebec County60.7-0.5 pts
6Somerset County59.7-0.3 pts
7Franklin County59.3-0.4 pts
8Oxford County58.8-0.6 pts
9Sagadahoc County58.6-0.8 pts
10Waldo County58.5-0.5 pts
11Hancock County58-0.5 pts
12Knox County57.3-0.5 pts
13Aroostook County57-0.7 pts
14Washington County56.6-0.9 pts
15Piscataquis County56.4-0.1 pts
16Lincoln County55.5-0.6 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, 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 Maine 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/maine-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 Maine 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/maine-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 Maine 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/maine-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_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 Maine 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/maine-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 Maine 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/maine-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/maine-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?

Penobscot County, with 62.8% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Lincoln County, with 55.5% 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 Maine: more rankings