California - Criteria: A (event)
| Ramos, John, Sherry House-Depot Saloon |
| Rancho Camulos |
| Rancho De Los Kiotes |
| Rancho Los Alamitos |
| Rancho Olompali |
| Rangers' Club |
| Ravenswood |
| Raymond-Summit Historic District |
| Rectory, Catholic Church of the Assumption |
| Redlands Central Railway Company Car Barn |
| Redlands Santa Fe Depot District |
| Redwood City Historic Commercial Buildings |
| Redwood Highway |
| Reedley National Bank |
| Reedley Opera House Complex |
| Reed's Store |
| Reilly |
| Remar Bakery |
| Rengstorff, Henry A., House |
| Renwick, Helen Goodwin, House |
| Republic Cafe |
| Rhoades Ranch |
| Rialto Building |
| Rialto Theatre |
| Richmond Shipyard Number Three |
| Ricks, Thomas F., House |
| Ridge Route, Old |
| Riverbank Branch Library |
| Riverside-Arlington Heights Fruit Exchange |
| Riverview Union High School Building |
| RMS QUEEN MARY |
| Roberto-Sunol Adobe |
| Robinson Hotel |
| Robinson, Virginia, Estate |
| Robles, Paso, Carnegie Library |
| Rockwell Field |
| Rodgers, Moses, House |
| Rodgers, Patrick, Farm |
| Rogers Dry Lake |
| Roma Bakery |
| Romain, Frank, House |
| Room 307, Gilman Hall, University of California |
| Roop's Fort |
| Rose Bowl, The |
| Rowland, John A., House |
| Royal Presidio Chapel |
| Rozas House |
| Rubel Castle Historic District |
| Ruiz-Alvarado Ranch Site |
| Rumsey Town Hall |
| Russian Hill-Macondray Lane District |
| Russian Hill-Vallejo Street Crest District |
| Russian Village District |
| Ryan House and Lost Horse Well |
| Sachse Spring Snow Survey Shelter |
| Sacramento Bank Building |
| Sacramento City Cemetery |
| Sacramento City Library |
| Sacramento Memorial Auditorium |
| Sacramento Northern Railway Historic District |
| Sacred Heart Catholic Church |
| Saint Helena Southern Pacific Railroad Depot |
| Saint Mary's Parish |
| Saint Sava Serbian Orthodox Church |
| Saline Valley Salt Tram Historic Structure |
| San Bernardino County Court House |
| San Buenaventura Mission Aqueduct |
| Sanchez Adobe Park |
| San Clemente Beach Club |
| San Diego Armed Services YMCA |
| San Diego Civic Center |
| San Diego Mission Church |
| San Diego Presidio |
| San Diego State College |
| San Diego Veterans' War Memorial Building-Balboa Park |
| San Fernando Building, The |
| San Francisco and North Pacific Railroad Station House-Depot |
| San Francisco Art Institute |
| San Francisco Bay Discovery Site |
| San Francisco Cable Cars |
| San Francisco Central YMCA |
| San Francisco Civic Center Historic District |
| San Francisco Juvenile Court and Detention Home |
| San Francisco-Oakland Bay Bridge |
| San Francisco Port of Embarkation, US Army |
| San Francisco State Teacher's College |
| San Gregorio House |
| San Jose Central Fire Station |
| San Jose Downtown Historic District |
| San Luis Obispo Carnegie Library |
| San Luis Obispo Light Station |
| San Mateo County Courthouse |
| San Miguel Island Archeological District |
| San Pedro, Los Angeles, & Salt Lake RR Depot |
| San Pedro Municipal Ferry Building |
| San Rafael Improvement Club |
| San Rafael Rancho |
| Santa Ana Fire Station Headquarters No. 1 |
| Santa Barbara County Courthouse |
| Santa Barbara Island Archeological District |
Data from United States Park Service and Wikidata
