Data / Rankings / Population under 18 / Counties in Maine

Counties in Maine by population under 18

Androscoggin County had the highest population under 18 of 16 counties in 2024, at 20%. Hancock County had the lowest, at 15.5%. The median was 17.3% and the figure for Maine was 17.5%. Source: the U.S. Census Bureau.

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Highest20Androscoggin County
Lowest15.5Hancock County
Median17.316 counties
Maine17.5History

Map of counties, 2024

Androscoggin County: 20 %Aroostook County: 18.9 %Cumberland County: 17.4 %Franklin County: 15.6 %Hancock County: 15.5 %Kennebec County: 18 %Knox County: 15.9 %Lincoln County: 15.9 %Oxford County: 18.1 %Penobscot County: 17.2 %Piscataquis County: 17.3 %Sagadahoc County: 17 %Somerset County: 18.5 %Waldo County: 17.3 %Washington County: 18.1 %York County: 16.9 %
  • Under 16
  • 16 to 17
  • 17 to 18
  • 18 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2024

Androscoggin County: 20 %Androscoggin County20Aroostook County: 18.9 %Aroostook County18.9Somerset County: 18.5 %Somerset County18.5Oxford County: 18.1 %Oxford County18.1Washington County: 18.1 %Washington County18.1Kennebec County: 18 %Kennebec County18Cumberland County: 17.4 %Cumberland County17.4Piscataquis County: 17.3 %Piscataquis County17.3Waldo County: 17.3 %Waldo County17.3Penobscot County: 17.2 %Penobscot County17.2Sagadahoc County: 17 %Sagadahoc County17York County: 16.9 %York County16.9Knox County: 15.9 %Knox County15.9Lincoln County: 15.9 %Lincoln County15.9Franklin County: 15.6 %Franklin County15.6Hancock County: 15.5 %Hancock County15.5Androscoggin County: 20 %Androscoggin County20Aroostook County: 18.9 %Aroostook County18.9Somerset County: 18.5 %Somerset County18.5Oxford County: 18.1 %Oxford County18.1Washington County: 18.1 %Washington County18.1Kennebec County: 18 %Kennebec County18Cumberland County: 17.4 %Cumberland County17.4Piscataquis County: 17.3 %Piscataquis County17.3Waldo County: 17.3 %Waldo County17.3Penobscot County: 17.2 %Penobscot County17.2Sagadahoc County: 17 %Sagadahoc County17York County: 16.9 %York County16.9Knox County: 15.9 %Knox County15.9Lincoln County: 15.9 %Lincoln County15.9Franklin County: 15.6 %Franklin County15.6Hancock County: 15.5 %Hancock County15.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Androscoggin County20-0.2 pts
2Aroostook County18.9-0 pts
3Somerset County18.5-0.1 pts
4Oxford County18.1-0.5 pts
5Washington County18.10 pts
6Kennebec County18-0.3 pts
7Cumberland County17.4-0.2 pts
8Piscataquis County17.3-0.4 pts
9Waldo County17.3-0.4 pts
10Penobscot County17.2-0.3 pts
11Sagadahoc County17-0.4 pts
12York County16.9-0.2 pts
13Knox County15.9-0.3 pts
14Lincoln County15.9-0.1 pts
15Franklin County15.6-0.7 pts
16Hancock County15.5-0.3 pts

Other periods

About this ranking

Residents aged 0 to 17 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.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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 0 to 17 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 0 to 17 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 under 18, 2024) [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 0 to 17 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 under 18, 2024. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/maine-counties?period=2024. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2024. 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-under-18/maine-counties?period=2024.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2024 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/maine-counties?period=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2024,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2024}},
  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-under-18/maine-counties?period=2024. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 0 to 17 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 under 18, 2024
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-under-18/maine-counties?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/maine-counties?period=2024.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18?

Androscoggin County, with 20% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hancock County, with 15.5% in 2024.

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 0 to 17 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 under 18: other rankings

Counties in Maine: more rankings