County · Maine

Cumberland County

Cumberland County is a county in the U.S. state of Maine. As of the 2020 census, the population was 303,069, making it the most populous county in Maine. Its county seat is Portland. Cumberland County was founded in 1760 from a portion of York County, Province of Massachusetts Bay, and named for William, Duke of Cumberland, a son of King George II. Cumberland County has the deepest and second-largest body of water in the state, Sebago Lake, which supplies tap water to most of the county. The county is the state's economic and industrial center, having the resources of the Port of Portland, the Maine Mall, and having corporate headquarters of major companies such as onsemi, IDEXX Laboratories, Unum, and TD Bank. Cumberland County is part of the Portland–South Portland, ME Metropolitan Statistical Area.

Governance bodies

Board of Commissioners Primary
governing council

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Cities and towns 3

Townships 25

Reference data (Census of Governments 2022)

Census ID (PID6): 166151
FIPS state: 23
FIPS county: 005
FIPS place: 99005
Census record name: COUNTY OF CUMBERLAND
Mailing address: 142 FEDERAL ST, PORTLAND 04101