California - Criteria: C (architecture/engineering)
| St. Raymond's Church |
| Streetcar Depot |
| Strout, George A., House |
| St. Thomas Aquinas Chapel |
| Stuart Company Plant and Office Building |
| Studio Building |
| St. Vincent Orphanage and School Building |
| Subway Terminal Building |
| Sugar Pine Point State Park |
| Sugg House |
| Suisun Masonic Lodge No. 55 |
| Sun House |
| Sunnyslope Lodge |
| Sunset Center |
| Sunset Towers |
| Superior Oil Company Building |
| Suscol House |
| Sutherland Fruit Company |
| Sutter Club |
| Sutter Creek Grammar School |
| Swain, C.W., House |
| Swartz Creek Bridge on Aetna Springs Road |
| Sweasey Theater-Loew's State Theater |
| Swedenborgian Church |
| Sweed, Philip, House |
| Sweet, A. H., Residence and Adjacent Small House |
| Sweet House |
| Sweetser Residence |
| Synder, John J., House |
| Tahoe Meadows |
| Tahquitz Canyon |
| Taylor, Duckworth and Company Foundry Building |
| Teacher Training School Building-San Diego State Normal School |
| Temelec |
| Temple Sherith Israel |
| Tenalu |
| Terwilliger, Claude and Florence, House |
| Tevis Block |
| Textile Center Building |
| The Bellevue-Staten |
| The Real Estate Associates (TREA) Houses |
| "Thomas, Franklin Rosborough ""Frank"", House" |
| Thorn House |
| Thorsen, William R., House |
| Tioga Hotel |
| Tioga Pass Entrance Station |
| Title Guarantee and Trust Company Building |
| Toberman, C. E., Estate |
| Tobin House |
| Tocaloma Bridge |
| Tomales Presbyterian Church and Cemetery |
| Torrance School |
| Torrey, Joseph and Carrie, House |
| Torrey Pines Lodge |
| Torrey Pines Park Road |
| Tower Bridge |
| Tower Theatre |
| Town House, The |
| Tracy City Hall and Jail |
| Tracy Inn |
| Tramway Gas Station |
| Travelers' Hotel |
| Treadwell Mansion and Carriage House |
| Tretheway Block |
| Trimmer Hill |
| Trinidad Head Light Station |
| Trinity Church |
| Trinity Presbyterian Church |
| Troy Laundry |
| Tucker House |
| Tufts, Joshua B., House |
| Tulare Union High School Auditorium and Administration Building |
| Tule Lake Segregation Center |
| Tuna Club of Avalon |
| Tuolumne County Courthouse |
| Tuolumne Meadows |
| Tuolumne Meadows Ranger Stations and Comfort Stations |
| Tupper and Reed Building |
| Turlock Carnegie Library |
| Turlock High School Auditorium and Gymnasium |
| Twentieth Street Historic District |
| Twenty-Five Foot Space Simulator |
| Twining Laboratories |
| Twin Lakes Fire Tool Cache |
| Twohy Building |
| Ukiah Main Post Office |
| Union Church of Dunnigan |
| Union Ferry Depot |
| Union Iron Works Powerhouse |
| Union Iron Works Turbine Machine Shop |
| Unitary Plan Wind Tunnel |
| University Heights Water Storage and Pumping Station Historic District |
| University High School |
| University House |
| Upland Public Library |
| Uptown Tenderloin Historic District |
| USCGC STORIS (cutter) |
| U.S. Courthouse |
| US Court House and Post Office |
| U.S. Customhouse |
Data from United States Park Service and Wikidata
