Wisconsin - Area of significance: Architecture
| St. Mary School |
| St. Mary's Rectory |
| St. Mary's Roman Catholic Church |
| St. Matthew's Episcopal Church |
| St. Matthias Episcopal Church |
| Stock Pavilion |
| Stolte, William, Jr., House |
| Stolte, William, Sr., House |
| Stone, Ben and Margaret, Boathouse |
| Stonefield |
| Stoner, Joseph J., House |
| Stoppenbach, Emil and Flora, House |
| Stoughton Main Street Commercial Historic District |
| Stoughton Universalist Church |
| St. Patrick's Church |
| St. Patrick's Roman Catholic Church |
| St. Patrick's Roman Catholic Church |
| St. Patrick's Roman Catholic Church |
| St. Patrick's Roman Catholic Church |
| St. Paul Evangelical Lutheran Church |
| St. Paul's Episcopal Church |
| St. Paul's Episcopal Church |
| St. Paul's Episcopal Church |
| St. Peter's and St. Joseph's Catholic Churches |
| St. Peter's Church |
| St. Peter's Episcopal Church |
| St. Peter's Roman Catholic Church |
| Strang, James Jesse, House |
| Strang, Soloman J., House |
| Stribley, Charles W., House |
| Strong Building |
| Strunk, John and Eleanor, House |
| St. Wenceslaus Roman Catholic Church |
| Suhr, John J., House |
| Sunnyhill Home |
| Sun Prairie Downtown Historic District |
| Sun Prairie Water Tower |
| Sunset Circle Residential Historic District |
| Sunset Hills Historic District |
| Sunset Point |
| Superior Entry South Breakwater Light |
| Sutliff, Solon and Mathilda, House |
| Swan House and Vita Spring Pavilion |
| Sylvan Avenue - Ridge Road Historic District |
| Tainter, Louis Smith, House |
| Tainter, Mabel, Memorial Building |
| Taliesin |
| Tallmadge, Montgomery and Nancy, House |
| Tallman House |
| Tank Cottage |
| Tayco Street Bridge |
| Taylor, A. E., House |
| Taylor County Courthouse |
| Temple of Free Masonry |
| Temple Zion and School |
| Ten Chimneys |
| Ten Chimneys |
| Ten Eyck, Albert and Minna, Round Barn |
| Tenney Building |
| Tenny, Dr. J. T., House |
| Tester and Polin General Merchandise Store |
| Thelen, John Nicholas and Hermina, House |
| Third Avenue Historic District |
| Third Avenue Historic District |
| Third Street Bridge |
| Third Ward Historic District |
| Third Ward School |
| Thomas, I. C., Drug Store |
| Thomas Stone Barn |
| Thompson, A.D., Cabin |
| Thompson, Erick J., House |
| Thompson's Block |
| Thompson, Thomas Henry, House |
| Thordarson Estate Historic District |
| Timm, Herman C., House |
| Tischer, Wilhelm Blacksmith Shop |
| Tomah Post Office |
| Tomah Public Library |
| Tompkins, James, House |
| Totten-Butterfield House |
| Town of Milwaukee Town Hall |
| Trade and Commerce Building |
| Trapp Filling Station |
| Trimbell, Derwood and Myrtle, House |
| Trimborn Farm |
| Trinity Episcopal Church |
| Trinity Espicopal Church |
| Trinity Evangelical Lutheran Church |
| Tripoli Temple |
| Trogner, George W. and Sarah, House |
| Trunck, Joseph and Augusta, Boathouse |
| Tufts, William B. and Jennie, House |
| Turck, Christian, House |
| Turner Hall |
| Tuttle, A.G., Estate |
| Two Rivers Post Office |
| Tygert Street Historic District |
| Uihlein, Herman, House |
| Ullius, Fred W., Jr., House |
| Union Depot |
Data from United States Park Service and Wikidata
