Data / Rankings / Population / Counties in Maine

Counties in Maine by population, 2025

Cumberland County had the highest population of 16 counties in 2025, at 317,222. Piscataquis County had the lowest, at 17,409. The median was 54,396 and the figure for Maine was 1.41 million. Source: the U.S. Census Bureau.

Highest317,222Cumberland County
Lowest17,409Piscataquis County
Median54,39616 counties
Maine1,414,874History

All counties, 2025

CSVChart (SVG)

Cumberland CountyCumberland County: 317,222 persons317,222York CountyYork County: 222,434 persons222,434Penobscot CountyPenobscot County: 157,967 persons157,967Kennebec CountyKennebec County: 129,067 persons129,067Androscoggin CountyAndroscoggin County: 116,487 persons116,487Aroostook CountyAroostook County: 66,609 persons66,609Oxford CountyOxford County: 60,346 persons60,346Hancock CountyHancock County: 57,171 persons57,171Somerset CountySomerset County: 51,620 persons51,620Knox CountyKnox County: 41,117 persons41,117Waldo CountyWaldo County: 40,693 persons40,693Sagadahoc CountySagadahoc County: 37,979 persons37,979Lincoln CountyLincoln County: 36,595 persons36,595Washington CountyWashington County: 31,334 persons31,334Franklin CountyFranklin County: 30,824 persons30,824Piscataquis CountyPiscataquis County: 17,409 persons17,409
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2025
persons		Change on 2024
1Cumberland County317,222+0.8%
2York County222,434+0.6%
3Penobscot County157,967+0.4%
4Kennebec County129,067+0.3%
5Androscoggin County116,487+0.8%
6Aroostook County66,609-0.5%
7Oxford County60,346+0.6%
8Hancock County57,171+0.1%
9Somerset County51,620+0.3%
10Knox County41,117+0.4%
11Waldo County40,693+0.2%
12Sagadahoc County37,979+0.8%
13Lincoln County36,595+0.2%
14Washington County31,334-0.4%
15Franklin County30,824-0.2%
16Piscataquis County17,409-0.3%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

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. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

Which county has the highest population?

Cumberland County, with 317,222 in 2025, according to the U.S. Census Bureau.

Which county has the lowest population?

Piscataquis County, with 17,409 in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.

Population: other rankings

Counties in Maine: more rankings