Winthrop is a town in Kennebec County, Maine, United States. The population was 6,092 at the 2010 census. Winthrop's population, however, approximately doubles during the summer months as part-year residents return to seasonal camps located on the shores of Winthrop's Lakes and Ponds. A recreational area located among lakes, the town includes the villages of Winthrop and East Winthrop, and is the center of the Winthrop Lakes Region. Winthrop is included in the Augusta, Maine Micropolitan New England City and Town Area.