What are the largest counties in Maine?

Cumberland County is the largest county in Maine, with 317,222 residents in 2025 (Census PEP). York County (222,434) and Penobscot County (157,967) come next.

Data as of 2025 · updated November 5, 2026

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All 16 Maine counties ranked

Maine counties ranked by population
Rank	County	Residents 2025	Change 2020–25
1	Cumberland County	317,222	+4.5%
2	York County	222,434	+4.8%
3	Penobscot County	157,967	+3.8%
4	Kennebec County	129,067	+3.5%
5	Androscoggin County	116,487	+4.8%
6	Aroostook County	66,609	−0.7%
7	Oxford County	60,346	+4.2%
8	Hancock County	57,171	+3.0%
9	Somerset County	51,620	+2.3%
10	Knox County	41,117	+1.1%
11	Waldo County	40,693	+2.6%
12	Sagadahoc County	37,979	+3.4%
13	Lincoln County	36,595	+3.8%
14	Washington County	31,334	+0.8%
15	Franklin County	30,824	+4.6%
16	Piscataquis County	17,409	+3.5%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Maine?

Cumberland County is the largest county in Maine, with 317,222 residents in 2025 (Census PEP). York County (222,434) and Penobscot County (157,967) come next.

How is this ranking calculated?

More rankings for Maine

Largest counties by population in other states

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