Ohio - Area of significance: Architecture
| Trinity Episcopal Church |
| Trinity Episcopal Church |
| Trinity German Evangelical Lutheran Church |
| Trinity Lutheran Church |
| Tripp-Bauer Building |
| Trop Farm |
| Troy Public Square |
| Trumbull County Courthouse |
| Tubbs-Sourwine House |
| Tuscarawas Avenue-Alexander Square Commercial Historic District |
| Tuscarawas County Courthouse |
| Tuttle House |
| Twelve Mile House |
| Twentieth Century Theatre |
| Twin Oaks |
| Twinsburg Congregational Church |
| Twinsburg Institute |
| Tytus, John B., House |
| Ulyatt, Abraham, House |
| Umsted Farm |
| Underwood Farms Rural Historic District |
| Unger, George B., House |
| Union Block |
| Union Church |
| Union Club |
| Union, Old, School Building |
| Union Terminal Group |
| Union Trust Building |
| Unionville District School |
| Unionville Tavern |
| United Brethren in Christ |
| United Brethren Publishing House |
| United Church of Huntington |
| United Methodist Church |
| United Methodist Church |
| United Methodist Church |
| United Motor Service Building |
| United States Courthouse and Custom House |
| United States Playing Card Company Complex |
| United States Post Office |
| United States Post Office and Courthouse |
| United States Post Office and Court House |
| Universalist Church Historic District |
| Universalist Church Of Westfield Center |
| University Club |
| University Hall, Cleveland State University |
| University Hall-Gray's Chapel |
| University, Hayes and Orton Halls |
| Unzicker-Cook House |
| Upham-Wright House |
| Upland Farm |
| Upper Arlington Historic District |
| Upper Downtown Canton Historic District |
| Upson House |
| Upson-Walton Company Building |
| Uptown Westerville Historic District |
| Urbana Monument Square Historic District |
| Ursuline Center |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office and Courthouse |
| US Post Office and Federal Building-Zanesville |
| Valentine Theater Building |
| Van Deman, Henry, House |
| Van Horn Building |
| Vanmeter Church Street House |
| Vanmeter Stone House and Outbuildings |
| Van Wert Bandstand |
| Van Wert County Courthouse |
| Variety Store Building and Theatre |
| Vaughan, John, House |
| Vaughn, Daniel, Homestead |
| Vaughn, Richard, Farm |
| Vaugh-Stacy-Evans Farm Historic District |
| Venice Building |
| Vermilion Institute |
| Vermilion Town Hall |
| Verona Apartments |
| Versailles Town Hall and Wayne Township House |
| Vesuvius Furnace |
| Viall Lodge |
| Vicary House |
| Village Historic District |
| Village Hobby Shop |
| Village of Addyston Historic District |
| Village of Mariemont |
| Villa San Bernardo Historic District |
| Vistula Historic District |
| Vitrolite Building |
| Voegele Building |
| Von Schulenburg, Ernst, House |
| Voris, Peter Jr., House |
| Wade Memorial Chapel |
| Wade Park District |
| Wadsworth, Benjamin, House |
| Wadsworth, Frederick, House |
Data from United States Park Service and Wikidata
