Data / Rankings / Population / Counties in Maine

Counties in Maine by population

Cumberland County had the highest population of 16 counties in 2021, at 306,150. Piscataquis County had the lowest, at 17,226. The median was 53,570 and the figure for Maine was 1.38 million. Source: the U.S. Census Bureau.

Highest306,150Cumberland County
Lowest17,226Piscataquis County
Median53,57016 counties
Maine1,379,009History

All counties, 2021

CSVChart (SVG)

Cumberland CountyCumberland County: 306,150 persons306,150York CountyYork County: 215,063 persons215,063Penobscot CountyPenobscot County: 153,367 persons153,367Kennebec CountyKennebec County: 125,803 persons125,803Androscoggin CountyAndroscoggin County: 112,760 persons112,760Aroostook CountyAroostook County: 67,075 persons67,075Oxford CountyOxford County: 58,699 persons58,699Hancock CountyHancock County: 56,349 persons56,349Somerset CountySomerset County: 50,791 persons50,791Knox CountyKnox County: 41,089 persons41,089Waldo CountyWaldo County: 39,988 persons39,988Sagadahoc CountySagadahoc County: 37,178 persons37,178Lincoln CountyLincoln County: 36,015 persons36,015Washington CountyWashington County: 31,200 persons31,200Franklin CountyFranklin County: 30,256 persons30,256Piscataquis CountyPiscataquis County: 17,226 persons17,226
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2021
persons		Change on 2020
1Cumberland County306,150+0.8%
2York County215,063+1.3%
3Penobscot County153,367+0.8%
4Kennebec County125,803+0.9%
5Androscoggin County112,760+1.4%
6Aroostook County67,0750%
7Oxford County58,699+1.4%
8Hancock County56,349+1.5%
9Somerset County50,791+0.6%
10Knox County41,089+1%
11Waldo County39,988+0.8%
12Sagadahoc County37,178+1.2%
13Lincoln County36,015+2.2%
14Washington County31,200+0.4%
15Franklin County30,256+2.7%
16Piscataquis County17,226+2.4%

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 306,150 in 2021, according to the U.S. Census Bureau.

Which county has the lowest population?

Piscataquis County, with 17,226 in 2021.

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