Topsham is a town in Sagadahoc County, Maine, United States. Topsham was included in the Lewiston-Auburn, Maine metropolitan New England city and town area. The population was 9,560 at the 2020 census. The town contains the census-designated place of the same name. It is part of the Portland-South Portland-Biddeford metropolitan area. The town is home to the annual Topsham Fair.

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