Oppenheim is a town in Fulton County, New York, United States.

East Canada Creek is a stream defining the western town line.

The creek flows out of the Adirondacks to join the Mohawk River, south of Oppenheim.

New York State Route 29 is an east-west highway across Oppenheim.

New York State Route 331, a north-south highway, intersects NY 29 at Oppenheim village.

23.1% of all households were made up of individuals, and 8.9% had someone living alone who was 65 years of age or older.