This is a directory of properties and districts listed on the National Register of Historic Places in Arizona. There are about 1,400 listed sites in the state, and each of its 15 counties has at least eight listings on the National Register. Forty-five of the state's sites are further designated as National Historic Landmarks.
The following are approximate tallies of current listings in Arizona on the National Register of Historic Places. These counts are based on entries in the National Register Information Database as of April 24, 2008 and new weekly listings posted since then on the National Register of Historic Places web site. There are frequent additions to the listings and occasional delistings, and the counts here are not official. Also, the counts in this table exclude boundary increase and decrease listings which modify the area covered by an existing property or district and which carry a separate National Register reference number.