California - Area of significance: Exploration/Settlement
| Post, Joseph W., House |
| Presidio |
| Price, John, House |
| Providence Townsite |
| Ramirez, Jose Manuel, House |
| Rancho Camulos |
| Rancho Los Alamitos |
| Raymond-Summit Historic District |
| Red Dog Townsite |
| Redondo Beach Original Townsite Historic District |
| Rhoades Ranch |
| ROBERT GRAY (hydrographic survey vessel) |
| Roberto-Sunol Adobe |
| Robinson, Virginia, Estate |
| Rodgers, Moses, House |
| Roop's Fort |
| Rowland, John A., House |
| Royal Presidio Chapel |
| Rozas House |
| Ruiz-Alvarado Ranch Site |
| Sand Hill Bluff Site |
| San Diego Mission Church |
| San Diego Presidio |
| San Francisco Bay Discovery Site |
| San Miguel Chapel Site |
| San Miguel Island Archeological District |
| San Rafael Rancho |
| Santa Barbara Island Archeological District |
| Santa Barbara Mission |
| Santa Clara Depot |
| Santa Cruz Downtown Historic District |
| Santa Rosa Island Archeological District |
| Scarlett Ranch |
| Scott, Hiram D., House |
| Scripps Hall |
| Scully Ranch |
| Serrano, Jose, Adobe |
| Shannon-Williamson Ranch |
| Shasta Inn and Weed Lumber Company Boarding House |
| Shaw House |
| Shaw, Isaac E., Building |
| Shorty Lovelace Historic District |
| Simi Adobe-Strathearn House |
| Simmons, William Adam, House |
| Slocum House |
| Smith and Clark Brothers Ranch and Grounds |
| Soda Springs Cabin |
| Southern Hotel |
| South of Campus Neighborhood |
| South Serrano Avenue Historic District |
| Space Launch Complex 10 |
| Spurgeon Block |
| Squatter's Cabin |
| St. George Hotel |
| St. Helena Public Cemetery |
| St. James Square Historic District |
| Stoner House |
| St. Vincent Orphanage and School Building |
| Sutter's Fort |
| Tharp's Log |
| The Real Estate Associates (TREA) Houses |
| Thomas House |
| Trimmer Hill |
| USCGC STORIS (cutter) |
| Valencia Hall |
| Vallejo Estate |
| Verlaque, Theophile, House |
| Villa Mira Monte |
| Von Pfister General Store |
| Wakamatsu Tea and Silk Colony Farm |
| Walker Pass |
| Warner's Ranch |
| Watson Log Cabin |
| Watson School |
| Watts & Tannahill Company Store |
| Wawona Covered Bridge |
| Wawona Hotel and Pavilion |
| Webber, John Lee, House |
| Westminster Presbyterian Church and Cemetery of Tremont |
| Wetmore House |
| Whalers Cabin |
| White, Michael, Adobe |
| Whitmore, Daniel, House |
| Wilsonia Historic District |
| Withington, George and Eliza, House |
| Wolf Store and Vail Ranch Headquarters |
| Woodbury-Story House |
| Woodside Store |
| Workman Adobe |
| Workman Family Cemetery |
| Yorba, Domingo Adobe and Casa Manuel Garcia |
| Zschokke, Theodore, Cottages |
Data from United States Park Service and Wikidata
