La Fargeville is a hamlet and census-designated place (CDP) in the town of Orleans in Jefferson County, New York, United States.

[2] The hamlet is named after John Frederick La Farge, one of the early proprietors of the town.

Already wealthy from an import business he had set up in New Orleans, he began in the 1820s to buy real estate and build houses in Jefferson County, speculation that eventually led to La Fargeville being named after him.

La Fargeville is in northern Jefferson County, in the central part of the town of Orleans.

The Chaumont River, a southwest-flowing tributary of Lake Ontario, flows through the center of the community.

County Road 181 (Plank Street) serves the hamlet from the west, leading 7 miles (11 km) to Clayton on the St. Lawrence.

Watertown, the Jefferson county seat, is 17 miles (27 km) south of La Fargeville via Routes 180 and 12.