Princeton is a town in Washington County, incorporated on February 3, 1832 from Plantation T17 ED, BPP. It later ceded some land to Baileyville in 1847.

The town encompasses most of Pocomoonshine Lake, the origins of whose fascinating name is unclear.

The Passamaquoddy Indian Reservation is located just north of the main village in Indian Township on U.S. Route 1, which continues its northward trek from Calais, through Woodland and Princeton.