List of the National Register of Historic Places listings in Madison County, New York This is intended to be a complete list of properties and districts listed on the National Register of Historic Places in Madison County, New York. The locations of National Register properties and districts (at least for all showing latitude and longitude coordinates below) may be seen in a map by clicking on "Map of all coordinates". Two properties, the Gerrit Smith Estate and the Oneida Community Mansion House, are further designated a National Historic Landmarks.