Cumberland is a city in and the county seat of Allegany County, Maryland, United States. It is the primary city of the Cumberland, MD-WV Metropolitan Statistical Area. At the 2010 census, the city had a population of 20,859, and the metropolitan area had a population of 103,299. Located on the Potomac River, Cumberland is a regional business and commercial center for Western Maryland and the Potomac Highlands of West Virginia.