This is intended to be a complete list of properties and districts listed on the National Register of Historic Places in Niagara 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". Four of these are further designated as National Historic Landmarks.
References
National Register of Historic Places listings in Niagara County, New York Wikipedia(Text) CC BY-SA