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. The median across all 16 is +1,368. Biggest climber in the top 100 since 2020: Penobscot County, ME, up 10 places to #3.

Flip the list · Most population lost, US counties →

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

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

02York County, MEME222,434+10,462−53%

03▲10Penobscot County, MEME157,967+5,768−443%

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

05▼2Androscoggin County, MEME116,487+5,348−465%

06▲4Oxford County, MEME60,346+2,569+19%

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

08▲4Franklin County, MEME30,824+1,368+198%

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

10▼5Sagadahoc County, MEME37,979+1,280−24%

11▲3Somerset County, MEME51,620+1,143+2%

12▼4Waldo County, MEME40,693+1,086−67%

13▼2Piscataquis County, MEME17,409+609−143%

14▼7Knox 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 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES