Pennsylvania - Criteria: C (architecture/engineering)
| St. Peter's Episcopal Church of Germantown |
| St. Peter's Kierch |
| St. Peters Village Historic District |
| Strafford Railroad Station |
| Strasburg Historic District |
| Strawbridge and Clothier Store |
| Strickland-Roberts Homestead |
| Strickland, William, Row |
| Strickler Family Farmhouse |
| Strode's Mill |
| Strode's Mill Historic District |
| Struthers Library Building |
| St. Severin's Old Log Church |
| St. Stanislaus Kostka Roman Catholic Church |
| St. Stephen's Church |
| St. Stephen's Episcopal Church |
| Stupp-Oxenrider Farm |
| Sturgis, Julius, Pretzel House |
| St. Vincent Archabbey Gristmill |
| Suburban Station Building |
| Suffolk Manor Apartments |
| Sugartown Historic District |
| Sullivan County Courthouse |
| Sullivan, James J., School |
| Summers, Lewis, Farm |
| Summit Hill High School |
| Summit Hotel |
| Sunbury Armory |
| Sunbury Historic District |
| Sun Oil Building |
| Susquehanna County Courthouse Complex |
| Sutch Road Bridge in Marlborough Township |
| Sutton-Ditz House |
| Sutton, John, Hall |
| Swamp Creek Road Bridge |
| Swatara Ferry House |
| Swatara Furnace |
| Swedish Lutheran Parsonage |
| Swetland Homestead |
| Tabor Home for Needy and Destitute Children |
| Tabor Reformed Church |
| Tamaqua Historic District |
| Tannery, The |
| Taylor, Bayard, School |
| Taylor, Benjamin, Homestead |
| Taylor-Cope Historic District |
| Taylor House |
| Taylor, Peter, Farmstead |
| Taylor, Phillip, House |
| Taylorstown Historic District |
| Teller Brothers-Reed Tobacco Historic District |
| Temple-Webster-Stoner House |
| Terminal Commerce Building |
| Terracina |
| Thaddeus Kosciuszko National Memorial |
| Thayer-Thompson House |
| The Elverson Building |
| Thirtieth Street Station |
| Thirty-third Street Bridge in Philadelphia |
| Thomas, Charles, House |
| Thomas Covered Bridge |
| Thomas, George C., Junior High School |
| Thomas Marble Quarry Houses |
| Thomas Mill and Miller's House |
| Thomas Mill Covered Bridge |
| Thomas, William, House |
| Thome, James, Farm |
| Thompson Cottage |
| Thompson Farm |
| Thompson, Gen. John, House |
| Thompson, John, House |
| Thompson Mill |
| Thompson, S. R., House |
| Thompson, Thomas H., House |
| Thornburg Historic District |
| Thornton Village Historic District |
| Thralls, Ernest, House |
| Thunderbird Lodge |
| Tilden, William J., Junior High School |
| Titusville City Hall |
| Todd, John, House |
| Tomlinson-Huddleston House |
| Totten House |
| Touraine, The |
| Towanda Historic District |
| Townhouse Row |
| Townsend House |
| Trevose Manor |
| Trexler Historic District |
| Trimble, George, House |
| Trimbleville Historic District |
| Trinity Hall |
| Trinity Lutheran Church |
| Tripp Family Homestead |
| Trostletown Bridge |
| Trout Hall |
| Troxell-Steckel House |
| Troy Public High School |
| Trusal Covered Bridge |
| Try Street Terminal |
Data from United States Park Service and Wikidata
