Gansevoort, New York is the default place name assigned by the United States Postal Service (USPS) for the area defined by the ZIP code 12831. It is likely named after Gansevoort, a hamlet located within the ZIP code and home to the Gansevoort Post Office at 50 Leonard Street. This zone includes parts of the towns of Wilton, Northumberland, and Moreau in Saratoga County, New York. Because parts of these three towns have a Gansevoort mailing address, some refer to residences or business as being in Gansevoort. The only alternative place name the USPS accepts for ZIP code 12831 is Wilton, New York.