This is a list of the properties and districts listed on the National Register of Historic Places listings in Onondaga 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". There are 146 properties and districts listed on the National Register in the county. Of those, 52 are outside of the city of Syracuse, and are listed here. The other 95 are in Syracuse and are listed separately. One property, the New York State Barge Canal, spans both the city and the remainder of the county.