Wisconsin - Area of significance: Architecture
| Simmons Island Beach House |
| Simonds 10-Sided Barn |
| Single, Benjamin, House |
| Sivyer, Fred, House |
| Sixth Church of Christ, Scientist |
| Sixth Street Historic District |
| Skindrud, Eric and Jerome, Farm |
| Skumsrud, Nils, House |
| Slaymaker, Stephen, House |
| Sloan, William P., House |
| Smiley, Samuel, House |
| Smith, Adam and Mary, House |
| Smith and Meadows Store Buildings |
| Smith, Camillia, House |
| Smith, Francis West, House |
| Smith, Hiram, House |
| Smith, John, House |
| Smith, Lloyd R., House |
| Smith, Richard C., House |
| Smith School |
| Smith, T. C., House |
| Sniteman, Charles C. and Katharyn, House |
| Society Hill Historic District |
| Solliday, Albert F., House |
| Soo Line Depot |
| Soper, Dr. Joseph and Olivia, House |
| South Branch Library |
| South Broadway Historic District |
| South Dickason Boulevard Residential Historic District |
| South First and Second Street Historic District |
| South First Street Residential Historic District |
| South Layton Boulevard Historic District |
| South Main Street Historic District |
| South Main Street Historic District |
| South Main Street Historic District |
| South Main Street Residential Historic District |
| South Milwaukee Passenger Station |
| South Milwaukee Post Office |
| Southport Beach House |
| South School |
| Southside Historic District |
| South Washington Street Historic District |
| Southwest Historic District |
| Southwest Side Historic District |
| Sparta Free Library |
| Sparta Masonic Temple |
| Spensley Farm |
| Sperling, Frederick, House |
| Spooner-Haight Farmstead |
| Spring Creek School |
| Spring Green Restaurant |
| Springstead |
| St. Andrew's Church |
| St. Andrews, Frank, House |
| Stanelle, Gottlieb and Beata, Farmhouse |
| Stark-Clint House |
| Star Theatre |
| State Bank of Ladysmith |
| State Bank of Spring Green |
| State Bank of Wisconsin |
| State Historical Society of Wisconsin |
| State Office Building |
| St. Augustine Catholic Church and Cemetery |
| St. Augustine Church |
| St Croix County Courthouse |
| Stebbins, Edward N. and Mary T., House |
| Stebbins, Harrison, House |
| Steckart and Falck Double Block |
| Steensland, Halle, House |
| Steiner, John, Store |
| Steinle Turret Machine Company |
| Steinman, John C. and Barbara, House |
| Steinmeyer, William, House |
| Steven House |
| Stewart, Hiram C., House |
| St. Germain dit Gauthier House |
| St. James Episcopal Church |
| St. John Chrysostom Church |
| St. John of God Roman Catholic Church, Convent, and School |
| St. John's Episcopal Church |
| St. John's Evangelical Lutheran Church Complex |
| St. John's Lutheran Church |
| St. John's Military Academy |
| St. John's Roman Catholic Cathedral |
| St. John the Baptist Catholic Church |
| St. Josaphat Basilica |
| St. Joseph's Catholic Church Complex |
| St. Joseph's Chapel |
| St. Joseph's Roman Catholic Church |
| St. Lawrence Catholic Church |
| St. Lucas Evangelical German Lutheran Church and Cemetery |
| St. Luke's Episcopal Church, Chapel, Guildhall, and Rectory |
| St. Mark's Episcopal Church |
| St. Mark's Episcopal Church, Guild Hall and Vicarage |
| St. Martini Evangelical Lutheran Church |
| St. Mary of the Angels Church and Monastery |
| St. Mary's Academy and College |
| St. Mary's Catholic Church |
| St. Mary's Catholic Church Complex |
| St. Mary’s Catholic Church Complex |
Data from United States Park Service and Wikidata
