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.
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04101 04102 04103 04108 04109 04019 04104 04112 04116 04122 04123 04124
04240 04241 04243
04401 04402
04106
04210 04211 04212 04223
04005 04006 04007
04073 04083
04072
04092 04098
04330 04332 04333 04336 04338
04901 04903
04412
04769
04530
04605
04736
04468 04489
04841
04915
04345 04359
04062
04252
03909 03911
03908
04250
03903
04619
04048 04061
04021
04347
03909 03910
04281
04074 04070
04105
04401
04085
04631
04043
04020
03905
04239