Cumberland County, ME
History
Cumberland County, the most populous of Maine’s counties, contains approximately 20% of the state’s population with less than 3% of the state’s land area. Four of the ten largest communities by population are in Cumberland County.The City of Portland dominates the cultural and commercial environment of the county, and for most of southern Maine. It is also an important transportation center, including Amtrak’s passenger rail service south, and bus transportation both north and south.
The county was created in 1760 when York county was divided into two new counties: Lincoln and Cumberland. In 1805, the northern part of the county was set off to form another: Oxford County. Later in 1854, further land was set off to create the new Androscoggin County. Other minor adjustment have taken place from time-to-time.
Source: http://maineanencyclopedia.com/cumberland-county/