Wisconsin - Significance region: Local
| Rowley, Dr. Newman C., House |
| Ruhland, Charles and Anna |
| Runkel, John P. and Mary, House |
| Rural on the Crystal Historic District |
| Sacred Heart Church |
| Saint Ann's Catholic Church and Cemetery |
| Saint Anthony Hospital |
| Saint Bernard's Chruch Complex |
| Saint Edward's Chapel |
| Saint James Court Apartments |
| Saint John Evangelical Lutheran Church |
| Saint Joseph of the Lake Church and Cemetery |
| Saint Luke's Church Complex |
| Saint Peter's Evangelical Lutheran Church |
| Saints Peter and Paul Roman Catholic Church Complex |
| Saint Vincent's Infant Asylum |
| Salem Evangelical Church |
| Salem Evangelical Church |
| Salsbury Row House |
| Sandrock Cliffs |
| Sanger, Casper M., House |
| Sauk City Fire Station |
| Sauk City High School |
| Sauk County Courthouse |
| Saylesville Historic District |
| Schauwitzer, Carl and Therese, House |
| Schendel, Reinhard and Amelia, House |
| Schlitz, Joseph, Brewing Company Saloon |
| Schlitz, Victor, House |
| Schofield Hall |
| Schofield, Robert, House |
| Schofield School |
| Schramka Funeral Home |
| Schroeder-Bohrod House |
| Schuetter, Henry House |
| Schulze, Ferdinand, House |
| Schunk, Jacob, Farmhouse |
| Schuster, George, House and Carriage Shed |
| Schuttler, Henry and Mary, House |
| Schwahn, William and Tilla, House |
| Schwartz Ballroom |
| Schwartz Family Home |
| Schweiger Industries Plant III |
| Scott, T. B., Free Library |
| Second Church of Christ Scientist |
| Second Street Commercial District |
| Second Ward School |
| Security Bank |
| Security Savings Bank |
| Senn, John L., House |
| Sensenbrenner, J. Leslie, House |
| Seven Pines Lodge |
| Seventh Day Baptist Church |
| Severance-Pipe Farmstead |
| Sevona Cabin |
| Sexton's House |
| Shadewald II Mound Group |
| Shadewald I Mound Group |
| Sharrow, Frances Kurth, House |
| Shawano Main Street Historic District |
| Shawano Post Office |
| Shaw Farm |
| Shaw Point Historic District |
| Sheboygan County Courthouse |
| Sheboygan Falls School |
| Sheboygan Light, Power and Railway Company Car #26 |
| Sheboygan Municipal Auditorium and Armory |
| Sheboygan Post Office |
| Sheboygan Theater |
| Sheboygan Valley Land and Lime Company |
| Sheeley House |
| Shekey, Albert and Mary, House |
| Shelton, William and Mary, Farmstead |
| Sheridan Apartment Building |
| Sherman Avenue Historic District |
| Sherman House |
| Sherry, Henry, House |
| Shopiere Congregational Church |
| Shorecrest Hotel |
| Shorewood Historic District |
| Shorewood Village Hall |
| Siebken's Resort |
| Siegner, George V., House |
| Sign of the Willows |
| Silurian Mineral Springhouse |
| Silver Dome Ballroom, The |
| Simeon Mills Historic District |
| Simmons, Gilbert M., Memorial Library |
| Simmons Island Beach House |
| Simonds 10-Sided Barn |
| Single, Benjamin, House |
| Sisson's Peony Gardens |
| Sisters of St. Joseph Complex |
| 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 |
Data from United States Park Service and Wikidata
