California - Criteria: A (event)
| Santa Barbara Mission |
| Santa Barbara Presidio |
| Santa Fe Coast Lines Hospital |
| Santa Fe Depot |
| Santa Fe Freight Depot |
| Santa Fe Hotel |
| Santa Fe Passenger Depot |
| Santa Fe Railway Passenger and Freight Depot |
| Santa Margarita Ranchhouse |
| Santa Monica Looff Hippodrome |
| Santa Paula Hardware Company Block-Union Oil Company |
| San Timoteo Canyon Schoolhouse |
| Saratoga Foothill Club |
| Saratoga Village Library |
| Sargent, Aaron A., House |
| Saticoy Southern Pacific Railroad Depot |
| Sausalito Woman's Club |
| Sawyers Bar Catholic Church |
| Schoenstein and Company Pipe Organ Factory |
| Schonchin Butte Fire Lookout |
| Schorlig House |
| Schramsberg Vineyard |
| Scott, Hiram D., House |
| Scott, Irving Murray, School |
| Scripps, George H., Memorial Marine Biological Laboratory |
| Scripps Hall |
| Scully Ranch |
| Seabiscuit's Stud Barn |
| Seal Beach City Hall |
| Sears, Roebuck & Company Mail Order Building |
| Sebastopol Depot of the Petaluma and Santa Rosa Railway |
| Second Baptist Church |
| Second Church of Christ, Scientist |
| Security Bank and Trust Company Building |
| Security Trust and Savings |
| Sequoia Union High School |
| Serrano, Jose, Adobe |
| Shadelands Ranch House |
| Shafter Research Station |
| Shannon-Williamson Ranch |
| Shasta State Historic Park |
| Shaw, Isaac E., Building |
| Shiloh Baptist Church |
| Shorty Lovelace Historic District |
| Sierra County Sheriff's Gallows |
| Sierraville School |
| Simi Adobe-Strathearn House |
| Simmons, William Adam, House |
| Sinton House |
| Six-Inch Rifled Gun No. 9 |
| Skidoo |
| Slocum House |
| Smiley Park Historic District |
| Smithsonian Institution Shelter |
| Smith-Tuthill Funeral Parlors |
| Snow Creek Ski Hut |
| Snow Flat Snow Survey Shelter |
| Soda Springs Cabin |
| Somerville Hotel |
| Sonoma Depot |
| Sonoma Grammar School |
| Sonoma Plaza |
| Sonoma State Home-Main Building |
| Sonoma Valley Woman's Club |
| Sonora Youth Center |
| South Berkeley Community Church |
| Southern California Gas Company Complex |
| Southern Hotel |
| Southern Pacific Depot |
| Southern Pacific Depot |
| Southern Pacific Depot |
| Southern Pacific Passenger Depot |
| Southern Pacific Railroad Company's Sacramento Depot |
| Southern Pacific Railroad Depot, Whittier |
| Southern Pacific Railroad Section Superintendent House |
| Southern Pacific Railroad Station |
| Southern Pacific Train Depot |
| South Hall |
| South of Campus Neighborhood |
| South San Francisco Hillside Sign |
| South San Francisco Opera House |
| South Serrano Avenue Historic District |
| Space Flight Operations Facility |
| Space Launch Complex 10 |
| Special Internal Revenue Bonded Warehouse, First District, No. 13 |
| Sperry Office Building |
| Sperry Union Flour Mill |
| Spotswood House |
| Spreckels Theatre Building |
| Spring Street Financial District |
| Squatter's Cabin |
| S.S. CATALINA |
| SS JEREMIAH O'BRIEN |
| SS Red Oak Victory (victory ship) |
| SS RIO DE JANEIRO Shipwreck |
| SS WINFIELD SCOTT (Steamship) |
| Standard Oil Building |
| Standish Hall |
| Stanford-Lathrop House |
| Stanton, Phillip Ackley, House |
Data from United States Park Service and Wikidata
