RANKING · 2025 ESTIMATES · 16 SHOWN OF 16

Fastest shrinking, Maine counties

Maine counties with the steepest population decline from the 2020 census to 2025. This list covers the 16 counties in Maine that qualify, ranked against each other statewide. The median across all 16 is +3.8%. Biggest climber in the top 100 since 2020: Knox County, ME, up 8 places to #3.

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SAME RANKING BYCities States Metros

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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Aroostook County, MEME66,609-0.7%+14.2 pts

02Washington County, MEME31,334+0.8%+4.6 pts

03▲8Knox County, MEME41,117+1.3%−7.9 pts

04▲1Somerset County, MEME51,620+2.3%0.0 pts

05▲5Waldo County, MEME40,693+2.7%−7.1 pts

06▲3Hancock County, MEME57,171+3.1%−7.3 pts

07▲7Sagadahoc County, MEME37,979+3.5%−1.5 pts

08▼4Piscataquis County, MEME17,409+3.6%+11.2 pts

09▼3Penobscot County, MEME157,967+3.8%+4.9 pts

10▲2Lincoln County, MEME36,595+3.9%−6.9 pts

11▼3Kennebec County, MEME129,067+4.4%+3.3 pts

12▼5Oxford County, MEME60,346+4.4%+0.4 pts

13▼10Franklin County, MEME30,824+4.6%+3.1 pts

14▲2Cumberland County, MEME317,222+4.7%−4.6 pts

15▼2Androscoggin County, MEME116,487+4.8%+6.2 pts

16▼1York County, MEME222,434+4.9%−8.5 pts

SHOWING 1–16 OF 16

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