Bowdoinham is a town in Sagadahoc County, Maine, United States. Bowdoinham was included in the Lewiston-Auburn, Maine metropolitan New England city and town area. The population was 3,047 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. The town is located on the west side of Merrymeeting Bay.

Richmond is a town in Sagadahoc County, Maine, United States. The population was 3,522 at the 2020 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area, situated at the head of Merrymeeting Bay.