La Fargeville is a hamlet and census-designated place in the town of Orleans in Jefferson County, New York, United States. The population was 733 at the 2020 census. The hamlet is named after John Frederick La Farge, one of the early proprietors of the town. La Fargeville was once a village, but dissolved its municipal corporation in 1922. La Fargeville is north of Watertown. The small hamlet has one school, LaFargeville Central School, which serves Pre-K through 12th grade.