Brunswick is a town in Cumberland County, Maine, United States. The population was 21,756 at the 2020 United States Census. Part of the Portland-South Portland-Biddeford metropolitan area, Brunswick is home to Bowdoin College, the Bowdoin International Music Festival, the Bowdoin College Museum of Art, the Peary-MacMillan Arctic Museum, and the Maine State Music Theatre. It was formerly home to the U.S. Naval Air Station Brunswick, which was permanently closed on May 31, 2011, and has since been partially released to redevelopment as "Brunswick Landing".