All - Architectural style - Neoclassical architecture
| Somerset County Courthouse |
| Somerville Theatre |
| Sonneborn Building |
| Sorrells, R. P., House |
| Soundview Manor |
| South Bend Remedy Company |
| South Bluefield Historic District |
| South Bushwick Reformed Protestant Dutch Church Complex |
| South Camden Trust Company |
| Southerland-Burnette House |
| Southern Pacific Depot Historic District |
| South Hall, River Falls State Normal School |
| Southington Public Library |
| Southington Township School |
| South Junior High School |
| South Junior High School |
| South Milwaukee Post Office |
| South Side Community Art Center |
| South Side Masonic Lodge No. 1114 |
| South Street Station |
| South Texas National Bank |
| South Union School |
| South Worcester Branch Library |
| Spalding, Leonard A., House |
| Sparta Free Library |
| Sparta Masonic Temple |
| Spencer County Courthouse |
| Spencer High School and Auditorium |
| Spencer, William Henry, House |
| Spielman, H. M. S., House |
| Spink County Courthouse |
| Spotswood Hall |
| Spratlen-Anderson Wholesale Grocery Company-Davis Brothers Warehouse |
| Springfield District Court |
| Springfield Fire & Marine Insurance Co. |
| Springfield Graded School |
| Springside Public School |
| Springville High School Mechanical Arts Building |
| Spruce Street YMCA |
| Spur Gasoline Station |
| Spurgeon Block |
| St. Adalbert Polish Catholic Church |
| St. Albans Main Street Historic District |
| Stalnaker Hall |
| Standard Glass and Paint Company Building |
| St. Ann's Federation Building |
| Stansbury House |
| Stanton Street Shul |
| Star Theatre |
| State Bank and Trust Company |
| State Bank Building |
| State Bank of Hammond Building |
| State Bank of Townsend |
| State Epileptic Colony Historic District |
| State Lunatic Asylum |
| State National Bank Building |
| State Normal Library |
| State Savings Bank |
| State Soldiers and Sailors Monument |
| State Theater |
| Statue of Liberty Enlightening the World |
| St. Benedict's Catholic School |
| St. Catherine of Sienna Convent |
| St. Charles Apartments |
| St. Charles Borromeo Church |
| St. Christopher's School |
| Steele County Courthouse |
| Steel, James, House |
| Steensland Library-St. Olaf College |
| Stein, Frederick W., House |
| Stein, L. L., House |
| St. Elizabeth of Hungary Roman Catholic Church |
| Stephens County Courthouse |
| Stephens County Courthouse |
| Stevensville Grade School-United Methodist Church |
| Stewart, Frank H., House |
| Stewart, Gen. Thomas J., Memorial Armory |
| Stewart's Dry Goods Company Building |
| St. Francis DeSales Roman Catholic Church |
| St. James Colored Methodist Episcopal Church |
| St. John's Church |
| St. John's Episcopal Church |
| St. John's Greek Orthodox Church |
| St. John's Missionary Baptist Church |
| St. John's Roman Catholic Cathedral |
| St. John the Baptist Catholic Church |
| St. Joseph County Infirmary |
| St. Joseph Public Library-Carnegie Branch |
| St. Joseph's Academy and Convent-Catherine McAuley School |
| St. Leonard's Catholic Church |
| St. Louis Street Missionary Baptist Church |
| St. Luke's Episcopal Church |
| St. Luke's Hospital |
| St. Maries Masonic Temple No. 63 |
| St. Mary's Academy |
| St. Mary's Assumption Church |
| St. Mary's Catholic Church |
| St. Mary's College |
| St. Mary's Nurses' Residence |
| St. Mary's Parochial School |
Data from United States Park Service and Wikidata
