All - Constructed - 1910–1919
| Skirvin Hotel |
| Smallwood, Ted, Store |
| Smith, Dr. Robert and Anne House |
| Smithfield Tithing Office |
| Smith, Francis 'Frank' and Eunice, House |
| Smith, J. Homer, House |
| Smith, J. P., Shoe Company Plant |
| Smith, William E., House |
| Smith-Williams-Durham Boarding House |
| Smouse, Winfield, House |
| Snead Manufacturing Building |
| Snow Camp Mutual Telephone Exchange Building |
| Snowy Mountain Fire Observation Station |
| Snyder, L. E., House |
| Snyder, William Penn, House |
| Soldiers and Sailors Memorial Coliseum |
| Soldiers and Sailors Memorial Hall |
| Somerville Theatre |
| Soo Line Depot |
| Soo Line High Bridge |
| Soo Line Passenger Depot |
| Soo Line Railroad Bridge |
| South Boise Fire Station |
| South Dakota Dept. of Transportation Bridge No. 03-327-230 |
| South Dakota State Capitol |
| Southern Pacific Railroad Section Superintendent House |
| South Ridgewood Elementary School |
| Spannring, John Otto, Family Farm |
| Sparta Building |
| Sperry Chalets |
| Spokane City Hall Building |
| Spokane Public Library |
| Spokane Public Library |
| Spotts Round Barn |
| Spreckels Theatre Building |
| Springfield General Hospital |
| Spring Glen Synagogue |
| Squaw Creek Bridge 2 |
| Stake, R.O., House |
| St. Aloysius Church |
| St. Anastasia Catholic School, Old |
| Standard Oil Building |
| Standard Paper Box Corporation |
| St. Andrews, Frank, House |
| St. Ann's Church Complex |
| St. Anselm's Roman Catholic Church and School |
| St. Anthony's Church and School |
| St. Anthony's Roman Catholic Church |
| Stanton Carnegie Library |
| Staples, Norris, House |
| State Bank of Kamiah |
| Staten Island Light |
| State Prison Historic District |
| State Sanitorium Bridge |
| Station 28 Minneapolis Fire Department |
| Stavig, Andrew and Mary, House |
| St. Charles Borromeo Church |
| St. Charles Borromeo Roman Catholic Parish Complex |
| St. Christopher's School |
| St. Clair Hospital |
| St. David Catholic Church |
| St. Edward's Convent, (Former) |
| Steen, Helmer and Selma, House |
| St. Elizabeth of Hungary Roman Catholic Church |
| Stephan, Louis, House |
| Sterling Free Public Carnegie Library |
| Stevens, Arnold, House |
| Stevenson Dam Hydroelectric Plant |
| Stewart Memorial Presbyterian Church |
| St. Fidelis Catholic Church |
| St. Gregory's Abbey and College |
| Stillwater Mountain Fire Observation Station |
| St. James Building |
| St. James Catholic Church |
| St. Jean Baptiste Church and Rectory |
| St. John's Catholic Church |
| St. John's Lutheran Church |
| St. Joseph Bridge |
| St. Joseph Catholic Church |
| St. Joseph Polish Catholic Church |
| St. Joseph's Catholic Church |
| St. Joseph's Home for the Aged |
| St. Julien House |
| St. Louis, Iron Mountain and Southern Railroad Depot |
| St. Mary Magdalen Church, Rectory, and Cemetery |
| St. Mary of the Assumption Catholic Church, School and Grottoes |
| St. Mary's Catholic Church |
| St. Mary's Roman Catholic Church |
| St. Michael's Parochial School |
| Stockton School |
| Stokes, Dr. Ella, House |
| Stonaker Cottage |
| Stoneham Firestation |
| Stoner House |
| Stony Point District School No. 4 |
| Stordahl, Olaf, Barn |
| St. Patrick Church |
| St. Patrick's Catholic Church |
| St. Paul African Methodist Episcopal (AME) Church |
| St. Paul's Parish Church |
Data from United States Park Service and Wikidata
