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 Fairchild Semiconductor, IDEXX Laboratories, Unum, and TD Bank. Cumberland County is part of the Portland–South Portland, ME Metropolitan Statistical Area.

Founded: November 1, 1760
Named for: Prince William, Duke of Cumberland
Seat: Portland
Largest city: Portland
Total: 1,217 sq mi (3,152.02 km²)
Land: 835 sq mi (2,162.64 km²)
Water: 383 sq mi (991.97 km²), 31%
Density: auto/sq mi (/km²)
Time zone: Eastern: UTC-5-4
Website: [www.cumberlandcounty.org]
Official Website: http://www.cumberlandcounty.org
Wikidata description: county in Maine, United States
Wikidata id: Q497788
Wikidata label: Cumberland County
Wikidata aliases: Array
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