Troy is a town in Waldo County, Maine. It was incorporated on February 22, 1812 from Bridge's Plantation, formerly Township T4 R1 NWP. Before the town finally settled on its current name, it went through a succession of other names. First incorporated as Kingville, it changed its name to Joy three years later in 1815, then to Montgomery in 1826, and finally to Troy in 1827. The various names were honoring General Bridge of Massachusetts, who was an early proprietor of the region, then Maine's first governor, William King. Benjamin Joy was also an early proprietor, and the English General Montgomery who died in the Battle for Quebec.
Maine Route 220 joins U.S. Route 202/Maine Route 9 at Green's Corner near the shores of Unity Pond. Carleton Pond, Carleton Bog, and Carleton Stream are accessible from Route 220 in the north end of town.