Oregon - Criteria: C (architecture/engineering)
| Portland New Chinatown-Japantown Historic District |
| Portland Police Block |
| Portland Public Service Building |
| Portland Skidmore/Old Town Historic District |
| PORTLAND (Steam Tug) |
| Portland Thirteenth Avenue Historic District |
| Portland Van and Storage Building |
| Portland Yamhill Historic District |
| Port-Manning House |
| Port Orford Coast Guard Station |
| Posey, John V. G., House |
| Postal Building |
| Post and King Saloon |
| Potter, Wallace and Glenn, House |
| Poulsen, Johan, House |
| Poultry Building and Incubator House |
| Povey, John E. G., House |
| Powers, Ira F., Building |
| Prager-Lombard House |
| P Ranch |
| Prospect Hotel |
| PT-658 (motor torpedo boat) |
| Public Service Building and Garage |
| Raabe, Capt. George, House |
| Railway Exchange Building and Huber's Restaurant |
| Rand, Ed, House |
| Ray, Harold Wass, House |
| Raymond, Jessie M., House |
| Redwoods Hotel |
| Reed Opera House and McCornack Block Addition |
| Reed, Samuel G., House |
| Regent Apartments |
| Reid School |
| Reinhart, Jacques and Amelia, House |
| Reorganized Church of Latter Day Saints |
| Reuter, Dr. J. A., House |
| Rice Apartments |
| Rice Brothers and Adams Building |
| Rice-Gates House |
| Rice, Napoleon, House |
| Ricen, Dr. Leo, House |
| Rice, Richard and Helen, House |
| Rice, Silas A., Log House |
| Richardson-Ulrich House |
| Riddle Ranch |
| Riley-Cutler House |
| Rim Drive Historic District |
| Rim Village Historic District |
| Ritner Creek Bridge |
| River Mill Hydroelectric Project |
| Roba Ranch, The |
| Robb, James D., House |
| Rock Creek Methodist Church |
| Rockey, Dr. A. E. and Phila Jane, House |
| Rock O' the Range Bridge |
| Rocky Butte Scenic Drive Historic District |
| Rocky Creek Bridge No. 01089 |
| Rogers, George, House |
| Rogue Elk Hotel |
| Rogue River Bridge No. 01172 |
| Rogue Theatre |
| Roome-Stearns House |
| Roosevelt Hotel |
| Roper, Charles and Theresa, House |
| Roseburg, Oregon, National Guard Armory |
| Rosenberg, Dr. J. J., House |
| Ruby, Alfred C. and Nettie, House |
| Saint Patrick's Roman Catholic Church |
| Salem Downtown State Street-Commercial Street Historic District |
| Salem Southern Pacific Railroad Station |
| Salerno Apartments |
| Salmon, W. S., House |
| Sandy Creek Bridge |
| San Farlando Apartments |
| Santa Barbara Apartments |
| Sather, Evan Andreas, House |
| Schaefers Building |
| Schanen-Zolling House |
| Schnabel, Charles J. and Elsa, House |
| Schulmerich, Edward, House |
| Scott, Leslie M., House |
| Seelig-Byler House |
| Seitz, Maurice, House |
| Selling Building |
| Senate Court Apartments |
| Sensel, Henry, Building |
| Settlemier, Jesse H., House |
| Seven Hundred Five Davis Street Apartments |
| Seward Hotel |
| Shaniko Historic District |
| Sharp, Edward F., Residential Ensemble |
| Shaver-Bilyeu House |
| Shaw-Dumble House |
| Sheep Ranch Fortified House |
| Sheffield, John and Sarah, House |
| Shelton-McMurphey House and Grounds |
| Sherlock Building |
| Sherman County Courthouse |
| Shinn, Horace J. and Ann S., Cottage |
| Shirk, David L., Ranch |
Data from United States Park Service and Wikidata
