Counties · Maine

Counties of Maine

Maine has 16 counties. Cumberland County is the largest with 317,222 residents in 2025. 15 of the 16 gained residents between 2020 and 2025 by the Census Bureau's estimates.

What counties are in Maine?

Sorted by the 2025 population estimate; sort by any column.

Counties of Maine: 2025 estimate, change since 2020, ACS 2020-2024 5-year estimates

Cumberland County	317,222	+4.7%	48	81	$95,677	$451,200
York County	222,434	+4.9%	44	59	$88,333	$395,700
Penobscot County	157,967	+3.8%	69	46	$66,356	$214,100
Kennebec County	129,067	+3.7%	34	36	$69,077	$238,200
Androscoggin County	116,487	+4.8%	21	32	$67,873	$252,800
Aroostook County	66,609	−0.7%	79	24	$56,700	$149,700
Oxford County	60,346	+4.5%	44	19	$60,173	$217,300
Hancock County	57,171	+3.0%	44	18	$72,744	$310,400
Somerset County	51,620	+2.3%	42	20	$58,179	$166,900
Knox County	41,117	+1.3%	20	13	$74,096	$324,900
Waldo County	40,693	+2.7%	29	8	$72,782	$257,700
Sagadahoc County	37,979	+3.5%	13	9	$87,806	$333,300
Lincoln County	36,595	+3.9%	24	10	$76,875	$332,700
Washington County	31,334	+0.8%	50	14	$56,024	$161,800
Franklin County	30,824	+4.7%	26	10	$58,675	$194,700
Piscataquis County	17,409	+3.6%	23	8	$61,345	$170,200

Source: PEP Vintage 2025 (CO-EST2025); American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Census population estimates

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections