Every NRHP listing should have a valid reference number (refnum) in the lists of National Register of Historic Places listings. This is already the case for over 83,000 listings, but that means we still have to update about 2500 listings on about 800 pages.

• If the certification date is before May 28, 2010 you can probably find it in this list. It's first sorted by state and than by county for easy searching.
• If the certification date is more recent or you can't find it in the list you can search the NRHP database.
• With Google you can find most listings if you instruct it to search on the nps.gov site