Oregon - Criteria: A (event)
| Morrow County Courthouse |
| Mosby Creek Bridge |
| Mosier Mounds Complex |
| Mountain View Cemetery |
| Mount Tabor Park |
| Mt. Hood Hotel Annex |
| Mt. Hood Railroad Linear Historic District |
| Mt. Pleasant Presbyterian Church |
| Mt. Stella Lookout |
| Multnomah County Poor Farm |
| Multnomah Hotel |
| Munson Valley Historic District |
| Musick Guard Station |
| Neighborhood House |
| Neighbors of Woodcraft Building |
| Nelson, Otto W. and Ida L., House |
| Nevada-California-Oregon Railway Passenger Station |
| New Cliff House |
| New Fliedner Building |
| New Heathman Hotel |
| New Redmond Hotel |
| Nez Perce Traditional Site, Wallowa Lake |
| North Bank Depot Buildings |
| Northwestern Electric Company-Alberta Substation |
| Oak Hills Historic District |
| Oakland Historic District |
| Odd Fellows Building |
| Odd Fellows Rural Cemetery |
| Office Bridge |
| O'Kane Building |
| O.K. Theatre |
| Olallie Lake Guard Station |
| Old First National Bank of Prineville, and Foster and Hyde Store |
| Old Garfield School |
| Old Stone House |
| Olds, Wortman and King Department Store |
| Old Town Historic District |
| Old US Post Office |
| Oleson, Ole and Polly, Farmhouse |
| Olson, Charles and Fae, House |
| Olympic Cereal Mill |
| Oregon-American Lumber Company Mill Office |
| Oregon City Carnegie Library |
| Oregon City Municipal Elevator |
| Oregon Cracker Company Building |
| Oregon Electric Railway Passenger Station |
| Oregon Iron Company Furnace |
| Oregon Pacific Railroad Linear Historic District |
| Oregon Short Line Railroad Depot |
| Oregon State Bank Building |
| Oregon State Capitol |
| Oregon State Fair Stadium and Poultry Building Ensemble |
| Oregon State Forester's Office Building |
| Oregon State Hospital Historic District |
| Oregon State Soldier's Home Hospital |
| Oregon State University Historic District |
| Oregon Trail, Wells Springs Segment |
| Oregon Trunk Passenger and Freight Station |
| Oregon-Washington Railroad & Navigation Company Passenger Station |
| Oriental Apartments |
| Osgood Ditch |
| Otis Elevator Company Building |
| Owyhee Dam Historic District |
| Pacific Coast Biscuit Company Building |
| Pacific Cooperative Poultry Producers Egg-Taking Station |
| Packard Service Building |
| Painter's Woods Historic District |
| Palace Hotel |
| Palestine Lodge |
| Pallay Building |
| Parker Meadows Shelter |
| Parvin Bridge |
| Paterson, Thomas M. and Alla M., House |
| Paulina Lake Guard Station |
| Peacock Lane Historic District |
| Pelota Fronton |
| Pengra Bridge |
| Phoenix Pharmacy |
| Picture Rock Pass Petroglyphs Site |
| Pilot Butte Canal: Downtown Redmond Segment Historic District |
| Pine Grove Community House |
| Pioneer Courthouse |
| Pioneer Hall, Linfield College |
| Pittock Block |
| Pleasant Grove Presbyterian Church |
| Portland and Southwestern Railroad Tunnel |
| Portland Buddhist Church |
| Portland City Hall |
| Portland Cordage Company Building |
| Portland Fire Station No. 17 |
| Portland Fire Station No. 23 |
| Portland Fire Station No. 7 |
| Portland New Chinatown-Japantown Historic District |
| Portland Police Block |
| Portland Railway, Light and Power Sellwood Division Carbarn Office and Clubhouse |
| Portland Sanitarium Nurses' Quarters |
| Portland Skidmore/Old Town Historic District |
| Portland Thirteenth Avenue Historic District |
| Portland Van and Storage Building |
| Port Orford Coast Guard Station |
Data from United States Park Service and Wikidata
