C St., NW (2280) Washington , DC 20240-0001 however, everything that goes through the C St. address will be irradiated (due to the anthrax scare shortly after 9/11), so if you are providing something that may be damaged (especially photographs), you can mail them via paid courier -- like Federal Express, UPS, etc. and use: Employee Name (or National Register of Historic Places Reference) National Park Service 1201 Eye Street, NW (2280) Washington , DC 20005 I want to know if a property is listed, how can I do that? Please look at the NRIS, the National Register Information System, our database of properties listed in the National Register of Historic Places. The NRIS is on our website at: http://www.nps.gov/history/nr/research/ You can search by state and/or county and/or city. The NRIS is arranged by the historic name of the property. If you know the address of the property, but not the historic name, you will have to look at each listing in the county and/or city. I am a member of the National Trust for Historic Preservation, what can you do for me? Nothing that we wouldn't do for anyone else. The National Register of Historic Places is not the National Trust for Historic Preservation. We have worked together on various projects in the past, but we are completely separate organizations. We are a Federal agency, supported by your tax dollars, we do not have any membership fees, etc. The National Trust for Historic Preservation is a private nonprofit organization