S. William Street, Johnstown, NY
Built in 1772
Houses Supreme & County Courts
Fourth Judicial District
This the oldest existing Court House in the State of New York and one of the oldest in the Nation still being used as a courthouse today.
Source: "Survey of Court Facilities in New York State," NYS Office of Court Administration. 1981 pg. 179
More historical information about the Fulton County Courthouse is available here: Fulton County Courthouse