Ohio - Criteria: A (event)
| Tecumseh Building |
| Temperance Row Historic District |
| Templar-Farrell Motor Sales Building |
| Temple on the Heights |
| Temple, The |
| Templin-Bradley Company |
| Theresa Building |
| Thomas Manufacturing Company Warehouse |
| Thomas Select School |
| Thornton-Guise Kitchen And House |
| Tiedemann, Hannes, House |
| Tiffin Waterworks |
| Times Building-Lodge Hall |
| Times-Star Building |
| Timken Vocational High School |
| Tinkers Creek Aqueduct |
| Tinnerman Steel Range Company |
| Toledo and Ohio Central Depot |
| Toledo and Ohio Central Railroad Station |
| Toledo Club |
| Toledo Harbor Light |
| Toledo Yacht Club |
| Tosheff's Restaurant and Hotel |
| Towers Hall, Otterbein College |
| Town Pump of East Sparta, The |
| Travelers Hotel |
| Travellers' Rest Inn |
| Treber Inn |
| Tremaine-Gallagher Residence |
| Tremont Historic District |
| Trinity Episcopal Church |
| Trinity German Evangelical Lutheran Church |
| Trinity Lutheran Church |
| Trotwood Railroad Station and Depot |
| Troy Public Square |
| Tuscarawas Avenue-Alexander Square Commercial Historic District |
| Twelve Mile House |
| Twinsburg Institute |
| Umsted Farm |
| Underwriters Salvage Corps |
| Unger, George B., House |
| Union Baptist Cemetery |
| Union Cemetery-Beatty Park |
| Union Steel Screw Office Building |
| Union Terminal Group |
| Unionville District School |
| Unionville Tavern |
| Uniopolis Town Hall |
| United Brethren in Christ |
| United Brethren Publishing House |
| United Methodist Church |
| United States Carriage Company |
| United States Playing Card Company Complex |
| Unit III, Dayton Project |
| Universalist Church Historic District |
| Universalist Church Of Westfield Center |
| Universal Terminal Company Dock and Warehouse |
| University Hall-Gray's Chapel |
| University, Hayes and Orton Halls |
| Unzicker-Cook House |
| Upper Arlington Historic District |
| Upper Downtown Canton Historic District |
| Upson-Walton Company Building |
| Urbana College Historic Buildings |
| Urbana Monument Square Historic District |
| U.S. Grant Birthplace and Grant Commemorative Sites Historic District |
| USS COD (submarine) |
| Valley Dale Ballroom |
| Valley Railway Historic District |
| Vanmeter Church Street House |
| Van Rooy Coffee Company Building |
| Van Wert Bandstand |
| Variety Store Building and Theatre |
| Vaughn, Daniel, Homestead |
| Vaughn, Richard, Farm |
| Vermilion Institute |
| Verona Apartments |
| Versailles Town Hall and Wayne Township House |
| Village Historic District |
| Village Hobby Shop |
| Village of Addyston Historic District |
| Village of Mariemont |
| Vistula Historic District |
| Voice of America Bethany Relay Station |
| Voris, Peter Jr., House |
| Waldschmidt-Camp Dennison District |
| Walker, Cristopher C., House and Farm |
| Walker, William, Jr., House |
| Wallace, Charlton, House |
| Wallace Farm |
| Wallischeck Homestead |
| Walnut Street School |
| Warner & Swasey Company Building |
| Warnke Covered Bridge |
| War Of 1812 Battle Site |
| Warren Public Library |
| Warsaw Hotel |
| Warszawa Neighborhood District |
| Warwick Interlocking Tower |
| Washington Cemetery Historic District |
Data from United States Park Service and Wikidata
