This list presents the full set of buildings, structures, objects, sites, or districts designated on the National Register of Historic Places in Clackamas County, Oregon, and offers brief descriptive information about each of them. The National Register recognizes places of national, state, or local historic significance across the United States. Out of over 90,000 National Register sites nationwide, Oregon is home to over 2,000, and 89 of those are found partially or wholly in Clackamas County. This National Park Service list is complete through NPS recent listings posted June 25, 2021.