Indiana - Criteria: A (event)
| Shakamak State Park Historic District |
| Shelburn Interurban Depot-THI&E Interurban Depot |
| Shelby County Courthouse |
| Shelbyville High School |
| Shelton |
| Sheridan Downtown Commercial Historic District |
| Shields' Mill Covered Bridge |
| Shiloh Meeting House and Cemetery |
| Shirk, W. W., Building |
| Sid-Mar |
| Siegel's Department Store |
| Silver Lake Historic District |
| Sim Smith Bridge |
| Singer Manufacturing-South Bend Lathe Co. Historic District |
| Skinner, DeForest, House |
| Smith Field |
| Snow Hill Covered Bridge |
| Soldiers and Sailors Memorial Coliseum |
| Solomon Enclave |
| Sons of Israel Synagogue |
| South 9th Street Historic District |
| South Bend Brewing Association |
| South Bend City Cemetery |
| Southern Indiana Railroad Freighthouse |
| South Frankfort Historic District |
| South Grade School Building |
| South Michigan Street Historic District |
| Southmoor Apartment Hotel |
| Southport High School, Old |
| South Walnut Street Historic District |
| South Wayne Historic District |
| Southwood Park Historic District |
| Speedway Historic District |
| Spencer County Courthouse |
| Spencer Park Dentzel Carousel |
| Spencer Public Library |
| Spink |
| Spring Street Freight House |
| SS CLIPPER |
| Stahly-Nissley-Kuhns Farm |
| Stallbohm Barn-Kaske House |
| Star Building |
| Starke County Courthouse |
| Star Milling and Electric Company Historic District |
| State and Prospect District |
| State Bank of Hammond Building |
| State Bank of Indiana, Branch of (Memorial Hall) |
| State Normal Library |
| State Sanitorium Bridge |
| State Street Commercial Historic District |
| State Street-Division Street Historic District |
| State Street Historic District |
| St. Casimir Parish Historic District |
| Steele Dunning Historic District |
| Stephenson Underwear Mill |
| Steuben County Courthouse |
| Steuben County Jail |
| Stinesville Commercial Historic District |
| St. John of the Cross Episcopal Church, Rectory and Cemetery |
| St. John's Church and Rectory |
| St. John's Lutheran Church |
| St. John's Lutheran Church and School |
| St. Joseph Catholic Church |
| St. Joseph County Infirmary |
| St. Joseph Indian Normal School |
| St. Joseph School |
| St. Louis, Besancon, Historic District |
| St. Mary's Catholic Church |
| Stockdale Mill |
| Stockheughter Covered Bridge |
| Stone Arch Bridge over McCormick's Creek |
| Stone's Trace |
| Stout, Daniel, House |
| St. Patrick's Farm |
| St. Peter's Square |
| St. Philip Neri Parish Historic District |
| Straber Ford Bridge |
| St. Stephen's African Methodist Episcopal Church |
| Studebaker Clubhouse and Tree Sign |
| Sturm, Louis H., Hardware Store |
| St. Vincent Villa Historic District |
| Sugar Grove Meetinghouse and Cemetery |
| Sullivan County Courthouse |
| Sullivan County Poor Home |
| Sunken Gardens |
| Switzerland County Courthouse |
| Sylvania |
| Taggart, F.P., Store |
| Taylor Carpet Company Building |
| Teague Barn Wabash Importing Company Farm Stable |
| Tepicon Hall |
| Terre Haute Fire Station No. 8 |
| Terre Haute Masonic Temple |
| Territorial Capitol of Former Indiana Territory |
| THI and E Interurban Depot-Substation |
| Thiebaud Farmstead |
| Third St. Joseph County Courthouse |
| Thompson, William N., House |
| Thorntown Public Library |
| Thorpe Ford Bridge |
Data from United States Park Service and Wikidata
