California - Area of significance: Social History
| Nuestra Senora Reina de la Paz |
| Nursery School for Visually Handicapped Children |
| Nystrom Elementary School-The Maritime Building |
| Oakland Free Library-23rd Avenue Branch |
| Oakland Free Library-Alden Branch |
| Oakland Free Library-Golden Gate Branch |
| Oakland Free Library-Melrose Branch |
| Oakland Hotel |
| Oakland YWCA Building |
| Oddfellows Hall |
| Odd Fellows Hall |
| Odd Fellows Hall |
| O'Donnell, Thomas, House |
| Old Masonic Hall |
| Old San Antonio Hospital |
| Old Town San Diego Historic District |
| Old YWCA Building |
| Olive Civic Center |
| Olivenhain Town Meeting Hall |
| Ontario Baseball Park |
| Orange Union High School |
| Orosi Branch Library |
| Oroville Carnegie Library |
| Our Lady of the Wayside |
| Oxnard, Henry T., Historic District |
| Oxnard Public Library |
| Pacific Electric Building |
| Palos Verdes Public Library and Art Gallery |
| Park Street Historic Commercial District |
| Pasadena Civic Center District |
| Patsiata Tübiji Nüümü-na Awaedu Ananisudüheina (Patsiata Historic District) |
| Patterson Branch Library |
| Pear Lake Ski Hut |
| Pena Adobe |
| People’s Park |
| Petaluma Woman’s Club |
| Phillips Mansion |
| Philomathean Clubhouse |
| Physicians Building |
| Pico, Pio, Casa |
| Pierotti, Attlio and Jane, House |
| Pisgah Home Historic District |
| Plaza Historic District |
| Plaza, The |
| Point Reyes Lifeboat Rescue Station, 1927 |
| Pomona Court and Apartments |
| Pomona YMCA Building |
| Pond Farm Pottery Historic District |
| Preston Castle |
| Preston School of Industry |
| Pythian Castle |
| Pythias Lodge Building |
| Rains, John, House |
| Ralston, William C., House |
| Ramona Town Hall |
| Rancho Camulos |
| Rancho El Encino |
| Red Dog Townsite |
| Redwood City Woman’s Club |
| Reedley Opera House Complex |
| Rengstorff, Henry A., House |
| Ricks, Thomas F., House |
| Riverbank Branch Library |
| RMS QUEEN MARY |
| Robinson Hotel |
| Robles, Paso, Carnegie Library |
| Rockhaven Sanitarium Historic District |
| Rogers, Will, House |
| Roop's Fort |
| Rosicrucian Fellowship Temple |
| Rumsey Town Hall |
| Russian Hill-Macondray Lane District |
| Russian Village District |
| Ryan Historic District |
| Sacramento City Cemetery |
| Sacramento City Library |
| Sacramento Junior College Annex and Extensions |
| Sacred Heart Parish Complex |
| Saint Vincent's Hill Historic District |
| San Clemente Beach Club |
| San Diego Armed Services YMCA |
| San Diego State College |
| San Diego Veterans' War Memorial Building-Balboa Park |
| San Francisco Central YMCA |
| San Francisco Civic Center Historic District |
| San Luis Obispo Carnegie Library |
| San Rafael Improvement Club |
| Santa Ana Fire Station Headquarters No. 1 |
| Santa Barbara Club |
| San Timoteo Canyon Schoolhouse |
| Saratoga Foothill Club |
| Saratoga Village Library |
| Sargent, Aaron A., House |
| Sausalito Woman's Club |
| Schreiber, Brock, Boathouse and Beach |
| Scripps Hall |
| Senior Hall |
| Serrano, Jose, Adobe |
| Sierraville School |
| Slocum House |
Data from United States Park Service and Wikidata
