RANKING · 2025 ESTIMATES · 16 SHOWN OF 16

Most population lost, Maine counties

Maine counties that lost 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: Knox County, ME, up 7 places to #3.

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SAME RANKING BYCities States Metros

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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Aroostook County, MEME66,609-496−96%

02Washington County, MEME31,334+239−117%

03▲7Knox County, MEME41,117+510−85%

04▲2Piscataquis County, MEME17,409+609−143%

05▲4Waldo County, MEME40,693+1,086−67%

06▼3Somerset County, MEME51,620+1,143+2%

07▲5Sagadahoc County, MEME37,979+1,280−24%

08Lincoln County, MEME36,595+1,358−58%

09▼4Franklin County, MEME30,824+1,368+198%

10▲1Hancock County, MEME57,171+1,693−65%

11▼4Oxford County, MEME60,346+2,569+19%

12▲2Androscoggin County, MEME116,487+5,348−465%

13Kennebec County, MEME129,067+5,425+348%

14▼10Penobscot County, MEME157,967+5,768−443%

15York County, MEME222,434+10,462−53%

16Cumberland County, MEME317,222+14,153−37%

SHOWING 1–16 OF 16

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES