All - Constructed - 1920–1929
| Reynolds, Richard J., High School and Richard J. Reynolds Memorial Auditorium |
| Rhodes Cabin |
| Rialto Theatre |
| Rice Meetinghouse |
| Richard, Pere Gabriel, Elementary School |
| Richards, Alfred H., House |
| Richardson County Courthouse |
| Richland Trust Building |
| Ridge Grove |
| Ridgeley School |
| Riley Hill School |
| Ringhoffer Inscription |
| Rio Felix Bridge At Hagerman |
| Rio Grande Bridge at San Juan Pueblo |
| Rispin Mansion |
| Riverbend |
| Riverside Baptist Church |
| Riverside Church |
| Riverside Municipal Auditorium and Soldier's Memorial Building |
| Riverview Apartments |
| Riviera Theatre |
| Roanoke Rapids Junior-Senior High School |
| Robbers Cave State Park |
| Roberts House |
| Robertson House |
| Robert Street Bridge |
| Robindreau, Alfred E., House |
| Rock Cabin |
| Rock House |
| Rock Island Depot |
| Rocky Creek Bridge No. 01089 |
| Rocky Mount Electric Power Plant |
| Rogers Milk Plant Building |
| Rookwood Apartments |
| Roosevelt Elementary School |
| Roosevelt, Theodore, High School |
| Rose Bowl, The |
| Rosebush House |
| Rosedale World War I Memorial Arch |
| Rosicrucian Fellowship Temple |
| Ross Hame |
| Royal Gorge Bridge and Incline Railway |
| Royal Laundry Complex |
| Ruby, Alfred C. and Nettie, House |
| Ruleton School |
| Rumph Mortuary |
| Rushmore Memorial Library |
| Ruston Central Fire Station |
| Ruston High School |
| Ryan's, John, House |
| Sacred Heart Catholic Church |
| Sacred Heart Church |
| Saegmuller House |
| Saenger Theater |
| Saenger Theatre |
| Saginaw County Fairgrounds Main Gate |
| Saint Francis of Assisi Complex |
| Saint John's Roman Catholic Church |
| Salaam Temple |
| Salerno Apartments |
| Saline County Courthouse |
| Salvation Army Building |
| Salvation Army Building, The |
| Salvation Army Waioli Tea Room |
| Sam Houston Hotel |
| Sanctuary River Cabin No. 31 |
| San Diego Armed Services YMCA |
| San Diego Athletic Club |
| San Diego Trust and Savings Bank Building |
| Sandpoint Federal Building |
| San Gabriel Mission Playhouse |
| San Joaquin Light & Power Corporation Building |
| Santa Barbara County Courthouse |
| Santa Fe Freight Depot |
| Santa Rosa Hotel |
| Santo Christo Church |
| Sarasota County Courthouse |
| Saratoga Village Library |
| Saul, B.F., Building |
| Schaefers Building |
| Schafer State Park |
| Schindler, R. M., House |
| Schmidt, Albert, House and Studio |
| School of Tropical Medicine |
| Schuetz, E.K., House |
| Schwartz, Alexander & Anna, Farm |
| Scobey Power Plant and Dam |
| Scottish Rite Cathedral |
| Scottish Rites Temple |
| Scranton Chamber of Commerce Building |
| Scripps College for Women |
| Seaba's Filling Station |
| Seaboard Air Line Depot, Old-Sebring |
| Seaboard Air Line Railway Station, Old |
| Seaboard Coastline Railroad Passenger Station |
| Seagate |
| Seamen's Church Institute of Newport |
| Sears, Roebuck and Company Catalog Distribution Center and Retail Store |
| Sears, Roebuck and Company Retail Department Store-Camden |
| Second National Bank |
Data from United States Park Service and Wikidata
