- Not to be confused with Perkins Plantation, Maine in Franklin County.
Perkins (also known as Swan Island) is an extinct town, now an unorganized territory (township) in Sagadahoc County. It was first settled in 1663, and organized as a town in 1847 from the two islands of Dresden (at that time in Lincoln County). In 1917 the Perkins town incorporation was repealed, and since then it remains an unorganized territory.  
County. The two islands that became Perkins Township were part of the original county of Yorkshire (now York) in what is now Maine. They were then set off as part of Lincoln County in 1760; and the town of Perkins was set off to Sagadahoc County in 1854.
- Maine Historical Records Survey Project, Division of Professional and Service Projects, Work Projects Administration, Counties, Cities, Towns, and Plantations of Maine: a Handbook of Incorporations, Dissolutions, and Boundary Changes (Portland, Maine: The Survey, 1940), 175 (digital p. 184). A digital version is available via a link in the FHL Catalog.
- Perkins Township, Sagadahoc County, Maine in Maine Genealogy (accessed 4 June 2013).
- Michael J. Leclerc, Genealogist's Handbook for New England Research, 5th ed. (Boston, Mass.: New England Historic Genealogical Society, 2012), 154. At various libraries (WorldCat); FHL Book 974 D27g 2012.