Wisconsin - Significance region: Local
| St. Mary's Roman Catholic Church |
| St. Matthew Christian Methodist Episcopal Church |
| St. Matthew's Episcopal Church |
| St. Matthias Episcopal Church |
| St. Matthias Mission |
| Stockbridge Harbor |
| Stolte, William, Jr., House |
| Stolte, William, Sr., House |
| Stone, Ben and Margaret, Boathouse |
| Stoppenbach, Emil and Flora, House |
| Stoughton High School |
| Stoughton Main Street Commercial Historic District |
| Stoughton Municipal Power Plant No.1 |
| 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. 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 Catholic School |
| St. Peter's Church |
| St. Peter's Episcopal Church |
| St. Peter's Roman Catholic Church |
| Stribley, Charles W., House |
| Strong Building |
| Strong Partridge Mound Group |
| Strunk, John and Eleanor, House |
| Sturgeon Bay Bridge |
| Sturgeon Bay Post Office |
| Suhr, John J., House |
| Sunnyhill Home |
| Sun Prairie Downtown Historic District |
| Sun Prairie Water Tower |
| Sunset Hills Historic District |
| Sunset Point |
| Superior Entry South Breakwater Light |
| Sure Johnson Mound Group |
| Sutliff, Solon and Mathilda, House |
| Swan House and Vita Spring Pavilion |
| Sylvan Avenue - Ridge Road Historic District |
| Syttende Mai Site |
| Tainter Cave |
| Tainter, Louis Smith, House |
| Tallmadge, Montgomery and Nancy, House |
| Tallman House |
| Tank Cottage |
| Tayco Street Bridge |
| Taylor, A. E., House |
| Taylor County Courthouse |
| Taylor, David, House |
| Telfer Site |
| Temple Beth Israel |
| Temple of Free Masonry |
| Temple Zion and School |
| Ten Eyck, Albert and Minna, Round Barn |
| Tenney Building |
| Tenney Park-Yahara River Parkway |
| Tenny, Dr. J. T., House |
| Tester and Polin General Merchandise Store |
| Teweles and Brandeis Grain Elevator |
| Texaco Service Station |
| Thelen, John Nicholas and Hermina, House |
| Thern Farmstead |
| 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 House Hotel |
| Thompson's Block |
| Thompson, Thomas Henry, House |
| Thordarson Estate Historic District |
| Thorp, Freeman and Jesse, House and Cottages |
| Thrasher's Opera House |
| Three Lakes Rod and Gun Club |
| Tigerton Village Hall and Engine House |
| Timm, Herman C., House |
| Tischer, Wilhelm Blacksmith Shop |
| Tollackson Mound Group |
| Tom 2 Site |
| Tomah Boy Scout Cabin |
| Tomah Post Office |
| Tompkins-Brindler Mound Group |
| 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 |
Data from United States Park Service and Wikidata
