Pennsylvania - Area of significance: Architecture
| Thomas, George C., Junior High School |
| Thomas Marble Quarry Houses |
| Thomas Mill and Miller's House |
| Thomas Mill and Miller's House |
| 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 |
| Trexler Historic District |
| Trimble, George, House |
| Trimbleville Historic District |
| Trinity Hall |
| Trinity Lutheran Church |
| Tripp Family Homestead |
| Trout Hall |
| Troxell-Steckel House |
| Troy Public High School |
| Try Street Terminal |
| Tulpehocken Creek Historic District |
| Tulpehocken Manor Plantation |
| Tulpehocken Station Historic District |
| Tunkhannock Historic District |
| Tunkhannock Viaduct |
| Turn, John, Farm |
| Turn Store and the Tinsmith's Shop |
| Turtle Creek High School |
| Tuscarora Academy |
| Twaddell's Mill and House |
| Twentieth Century Club of Lansdowne |
| Twin Bridges Rural Historic District |
| Twining Farm |
| Twin Trees Farm |
| Tyler, George F., Mansion |
| Tyler, John J., Arboretum |
| Tyrone Armory |
| Tyrone Borough Historic District |
| Uhlerstown Historic District |
| Uneek Havana Cigar Company |
| Union Church and Burial Ground |
| Union City Historic District |
| Union Hotel |
| Union League of Philadelphia |
| Union Library Company |
| Union Methodist Episcopal Church |
| Uniontown Downtown Historic District |
| Union Trust Building |
| Unionville Historic District |
| Unionville Village Historic District |
| United Cigar Manufacturing Company |
| United States Custom House |
| United States Post Office-Main Branch |
| United States Post Office-Punxsutawney |
| United States Post Office-Sewickley Branch |
| United Steelworkers Local #1211 Union Hall |
| Universalist Meeting House of Sheshequin |
| University Avenue Bridge |
| University of Pennsylvania Campus Historic District |
| Upper Aquetong Valley Historic District |
| Upper Roxborough Historic District |
| Upsala |
| Uptown Somerset Historic District |
| Uptown Theater and Office Building |
| US Court House and Post Office Building |
| U.S. Mint Building at Philadelphia |
| U.S. Naval Home |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office and Court House |
| US Post Office and Courthouse-Pittsburgh |
| US Post Office-Charleroi |
| US Post Office-Connellsville |
| US Post Office-Hanover |
| Valley of Allentown Scottish Rite Cathedral |
| Vandergrift Historic District |
| Van Dyne Civic Building |
| Van Kirk Farm |
| Vansant Farmhouse |
| Vare, Abigail, School |
| Vare, Edwin H., Junior High School |
| Vaux, Roberts, Junior High School |
| Vicary, Capt. William, House |
Data from United States Park Service and Wikidata
