Falmouth is a town in Cumberland County, Maine, United States. The population was 12,444 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. A northern suburb of Portland, Falmouth borders Casco Bay and offers one of the largest anchorages in Maine. The town is home to three private golf clubs an…Falmouth is a town in Cumberland County, Maine, United States. The population was 12,444 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. A northern suburb of Portland, Falmouth borders Casco Bay and offers one of the largest anchorages in Maine. The town is home to three private golf clubs and the Portland Yacht Club.