Oregon - Area of significance: Architecture
| Seitz, Maurice, House |
| Selling Building |
| Senate Court Apartments |
| Sengstake Building |
| Sensel, Henry, Building |
| Settlemier, Jesse H., House |
| Seven Hundred Five Davis Street Apartments |
| Seward Hotel |
| 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 |
| Sherman, Eleanor, House |
| Sherrard-Fenton House |
| Sherwood, A. J., House |
| Shinn, Horace J. and Ann S., Cottage |
| Shipley-Cook Farmstead |
| Shipley, U. G., House and Garden |
| Shirk, David L., Ranch |
| Shively-McClure Historic District |
| Sholes, Albert S., House |
| Shone-Charley House |
| Shorey, Charles, House |
| Shute-Meierjurgen Farmstead |
| Sigglin, Charles O., Flats |
| Sigler House |
| Silcox Hut |
| Silsby, Col. William H., House |
| Silver Falls State Park Concession Building Area |
| Silverton Commercial Historic District |
| Sinnott Memorial Building No. 67 |
| Siskiyou Smokejumper Base |
| Skidmore Academy Historic District |
| Slade, J. E., House |
| Slater Building |
| Smeede Hotel |
| Smith, Alfred H. and Mary E., House |
| Smith, Alvin T., House |
| Smith, Andrew, House |
| Smith, Bernard Pitzer, House |
| Smith, Blaine, House |
| Smith, E. L., Building |
| Smith, Henry Clay, House |
| Smith, Herbert and Katherine, House |
| Smith, James Alexander, and Elmarion, Barn and Lame-Smith House |
| Smith, Mary J. G., House |
| Smith, Milton W., House |
| Smith, N. P., Pioneer Hardware Store |
| Smith-Ohmart House |
| Smith, Percy A., House |
| Smithson and McKay Brothers Blocks |
| Smith, Stanley C. E., House |
| Smith, Walter V., House |
| Snowy Butte Flour Mill |
| Soap Creek School |
| Soderberg, Peter and Bertha, House |
| Sod House Ranch |
| Sommerville, Edgar, House |
| Southern Pacific Passenger Depot |
| Southern Pacific Railroad Passenger Station and Freight House |
| South First National Bank Block |
| South Main Street Commercial Historic District |
| South Oakdale Historic District |
| South Portland Historic District |
| Sovereign Hotel |
| Spalding Building |
| Spaulding, Charles K., House |
| Spence, Jack, House |
| Spencer, Arthur Champlin, and Margaret Fenton Spencer House |
| Sphier, D.H., Building |
| Spies-Robinson House |
| Spokane, Portland and Seattle Railroad Warehouse |
| Sprague-Marshall-Bowie House |
| Springfield General Hospital |
| Springfield Motors Buick Dealership |
| Spring Valley Presbyterian Church |
| Spring Valley School |
| Sprouse, John A., Jr., House |
| Stange, August J., House |
| Staples, Norris, House |
| Starkey-McCully Block |
| Starr and Blakely Drug Store |
| Star Ranger Station |
| Star Ranger Station Building, Old |
| Starr, Edwin and Anna, House |
| State Library of Oregon |
| Stauffer, John, House and Barn |
| St. Elizabeth Hospital (Old) |
| Stellmacher, Gus and Emma, Farmstead |
| Stephens Community Historic District |
| Stevens Building |
| Stevens, Charles, House |
| St. Helens Downtown Historic District |
| Still-Perkins House |
| St. James Episcopal Church |
| St. James Lutheran Church |
Data from United States Park Service and Wikidata
