RANKING · 2025 ESTIMATES · 16 SHOWN OF 16

Largest by population, Maine counties

The most populous Maine counties as of the 2025 population estimates. This list covers the 16 counties in Maine that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Cumberland County, MEME317,222+19%

02York County, MEME222,434+19%

03Penobscot County, MEME157,967+9%

04Kennebec County, MEME129,067+10%

05Androscoggin County, MEME116,487+12%

06Aroostook County, MEME66,609−10%

07Oxford County, MEME60,346+10%

08Hancock County, MEME57,171+10%

09Somerset County, MEME51,620+1%

10Knox County, MEME41,117+4%

11Waldo County, MEME40,693+12%

12Sagadahoc County, MEME37,979+8%

13Lincoln County, MEME36,595+9%

14Washington County, MEME31,334−8%

15Franklin County, MEME30,824+5%

16Piscataquis County, MEME17,409+1%

SHOWING 1–16 OF 16

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