RANKING · 2025 ESTIMATES · 16 SHOWN OF 16

Most population gained, Maine counties

Maine counties that added the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 16 counties in Maine that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Cumberland County, MEME317,222+14,153−37%

02York County, MEME222,434+10,462−53%

03Penobscot County, MEME157,967+5,768−443%

04Kennebec County, MEME129,067+5,425+348%

05Androscoggin County, MEME116,487+5,348−465%

06Oxford County, MEME60,346+2,569+19%

07Hancock County, MEME57,171+1,693−65%

08Franklin County, MEME30,824+1,368+198%

09Lincoln County, MEME36,595+1,358−58%

10Sagadahoc County, MEME37,979+1,280−24%

11Somerset County, MEME51,620+1,143+2%

12Waldo County, MEME40,693+1,086−67%

13Piscataquis County, MEME17,409+609−143%

14Knox County, MEME41,117+510−85%

15Washington County, MEME31,334+239−117%

16Aroostook County, MEME66,609-496−96%

SHOWING 1–16 OF 16

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES