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 2016, at 63.7%. Lincoln County had the lowest, at 56.4%. The median was 59.7% and the figure for Maine was 61.3%. Source: the U.S. Census Bureau.

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Highest63.7Penobscot County
Lowest56.4Lincoln County
Median59.716 counties
Maine61.3History

Map of counties, 2016

Androscoggin County: 61.3 %Aroostook County: 58.3 %Cumberland County: 63.3 %Franklin County: 60.3 %Hancock County: 59.2 %Kennebec County: 61.7 %Knox County: 58.4 %Lincoln County: 56.4 %Oxford County: 59.6 %Penobscot County: 63.7 %Piscataquis County: 57.2 %Sagadahoc County: 59.8 %Somerset County: 60.4 %Waldo County: 59.5 %Washington County: 58 %York County: 61.7 %
  • Under 58
  • 58 to 60
  • 60 to 62
  • 62 and over
%, 2016. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2016

Penobscot County: 63.7 %Penobscot County63.7Cumberland County: 63.3 %Cumberland County63.3Kennebec County: 61.7 %Kennebec County61.7York County: 61.7 %York County61.7Androscoggin County: 61.3 %Androscoggin County61.3Somerset County: 60.4 %Somerset County60.4Franklin County: 60.3 %Franklin County60.3Sagadahoc County: 59.8 %Sagadahoc County59.8Oxford County: 59.6 %Oxford County59.6Waldo County: 59.5 %Waldo County59.5Hancock County: 59.2 %Hancock County59.2Knox County: 58.4 %Knox County58.4Aroostook County: 58.3 %Aroostook County58.3Washington County: 58 %Washington County58Piscataquis County: 57.2 %Piscataquis County57.2Lincoln County: 56.4 %Lincoln County56.4Penobscot County: 63.7 %Penobscot County63.7Cumberland County: 63.3 %Cumberland County63.3Kennebec County: 61.7 %Kennebec County61.7York County: 61.7 %York County61.7Androscoggin County: 61.3 %Androscoggin County61.3Somerset County: 60.4 %Somerset County60.4Franklin County: 60.3 %Franklin County60.3Sagadahoc County: 59.8 %Sagadahoc County59.8Oxford County: 59.6 %Oxford County59.6Waldo County: 59.5 %Waldo County59.5Hancock County: 59.2 %Hancock County59.2Knox County: 58.4 %Knox County58.4Aroostook County: 58.3 %Aroostook County58.3Washington County: 58 %Washington County58Piscataquis County: 57.2 %Piscataquis County57.2Lincoln County: 56.4 %Lincoln County56.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Penobscot County63.7-0.5 pts
2Cumberland County63.3-0.3 pts
3Kennebec County61.7-0.3 pts
4York County61.7-0.3 pts
5Androscoggin County61.3-0.4 pts
6Somerset County60.4-0.3 pts
7Franklin County60.3-0.8 pts
8Sagadahoc County59.8-0.5 pts
9Oxford County59.6-0.4 pts
10Waldo County59.5-0.6 pts
11Hancock County59.2-0.8 pts
12Knox County58.4-0.4 pts
13Aroostook County58.3-0.6 pts
14Washington County58-0.5 pts
15Piscataquis County57.2-0.7 pts
16Lincoln County56.4-0.4 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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/maine-counties?period=2016.
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 63.7% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Lincoln County, with 56.4% in 2016.

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