The National Register of Historic Places recognizes buildings, structures, objects, sites, and districts of national, state, or local historic significance across the United States.
[1] Out of over 90,000 National Register sites nationwide,[2] Oregon is home to more than 2,000 NRHP listings.
[3] Over one-fourth of the NRHP listings in the state are found in Multnomah County.
In turn, the large majority (over 90%) of Multnomah's NRHP sites are situated within the city of Portland.
[4] The following are approximate tallies of current listings by county.