Data / Rankings / Population / Counties in Maine

Counties in Maine by population

Cumberland County had the highest population of 16 counties in 2020, at 303,588. Piscataquis County had the lowest, at 16,815. The median was 52,991 and the figure for Maine was 1.36 million. Source: the U.S. Census Bureau.

Highest303,588Cumberland County
Lowest16,815Piscataquis County
Median52,99116 counties
Maine1,364,546History

All counties, 2020

CSVChart (SVG)

Cumberland CountyCumberland County: 303,588 persons303,588York CountyYork County: 212,272 persons212,272Penobscot CountyPenobscot County: 152,174 persons152,174Kennebec CountyKennebec County: 124,732 persons124,732Androscoggin CountyAndroscoggin County: 111,181 persons111,181Aroostook CountyAroostook County: 67,051 persons67,051Oxford CountyOxford County: 57,894 persons57,894Hancock CountyHancock County: 55,512 persons55,512Somerset CountySomerset County: 50,469 persons50,469Knox CountyKnox County: 40,663 persons40,663Waldo CountyWaldo County: 39,666 persons39,666Sagadahoc CountySagadahoc County: 36,731 persons36,731Lincoln CountyLincoln County: 35,244 persons35,244Washington CountyWashington County: 31,091 persons31,091Franklin CountyFranklin County: 29,463 persons29,463Piscataquis CountyPiscataquis County: 16,815 persons16,815
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2020
persons
1Cumberland County303,588
2York County212,272
3Penobscot County152,174
4Kennebec County124,732
5Androscoggin County111,181
6Aroostook County67,051
7Oxford County57,894
8Hancock County55,512
9Somerset County50,469
10Knox County40,663
11Waldo County39,666
12Sagadahoc County36,731
13Lincoln County35,244
14Washington County31,091
15Franklin County29,463
16Piscataquis County16,815

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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Rank Counties in Maine by population using official data, and cite the source.
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Questions

Which county has the highest population?

Cumberland County, with 303,588 in 2020, according to the U.S. Census Bureau.

Which county has the lowest population?

Piscataquis County, with 16,815 in 2020.

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