Ohio - Area of significance: Architecture
| Wadsworth, James, House |
| Waernicke-Hille House And Store |
| Wagner Brothers Bottling Works |
| Wagner Palace |
| Waldschmidt-Camp Dennison District |
| Walhounding Canal Lock No. 9 |
| Walke, Anthony, and Susan Cardinal, House |
| Walker and Weeks Office Building |
| Walker, Cristopher C., House and Farm |
| Wallace, Charlton, House |
| Walling, Ansel T., House |
| Wallischeck Homestead |
| Walnut Hills United Presbyterian Church |
| Walnut Street School |
| Walper, Capt. Henry, House |
| Walters, Dr. Jefferson A., House |
| Wapakoneta Commercial Historic District |
| Warder, John Aston, House |
| Warder Public Library |
| Ward House |
| Ward, John Q. A., House |
| Ward-Thomas House |
| Ward, W. S., House |
| Ware, Edwin L., House |
| Waring House |
| Warner Theater |
| Warren Commercial Historic District |
| Warren, Moses, House |
| Warren Public Library |
| Warren Tavern Complex |
| Warsaw Avenue Historic District |
| Warsaw Hotel |
| Warszawa Neighborhood District |
| Washburn, Rev. Ebenezer, House |
| Washington Avenue Historic District |
| Washington Cemetery Historic District |
| Washington Court House Commercial Historic District |
| Washington Heights School |
| Washington School |
| Washington Terrace Apartments |
| Washington Township School |
| Waterman Service Building |
| Water Street Commercial Buildings |
| Waterstreet Historic District |
| Watertown Historic District |
| Waterville Commercial District |
| Watkins House |
| Watterson School |
| Watt-Groce-Fickhardt House |
| Waverly Canal Historic District |
| Wayne County Courthouse District |
| Waynesville Engine House and Lockup |
| Waynesville Greek Revival Houses |
| Waynesville Main Street Historic District |
| Webster Manufacturing |
| Weddle, Callahill and Priscilla, House |
| Weizer Building |
| Weizer Building |
| Wellington Center Historic District |
| Wellington Historic District |
| Wells Building |
| Wells-Clark-Strouss House |
| Welsbach Building |
| Welsh Congregational Church |
| Welsh Presbyterian Church |
| Welton, Allen, House |
| Werner Company Building |
| Werner, Edward P., House |
| Werner Inn |
| Wesley Chapel |
| Wesley Chapel |
| West Alexandria Depot |
| West Baptist Church |
| Westcott House |
| West End Elementary School |
| Westerly Apartments |
| Western Female Seminary |
| Western Reserve Academy |
| Western Reserve Building |
| Westervelt Hall |
| Westerville High School-Vine Street School |
| West Fourth Street Historic District |
| West Fourth Street Historic District (Amendment) |
| West High School |
| West House |
| West Main Street District |
| West Main Street District |
| West Market Street Boulevard Historic District |
| Westminster Church |
| Westmont Building |
| Westmoreland Historic District |
| West Mound Street Historic District |
| West Side Market |
| West Technical High School |
| West Third Street Historic District |
| West Union School |
| West View |
| Westwood Town Center Historic District |
| Westwood United Methodist Church |
| Weustoff and Getz Company |
Data from United States Park Service and Wikidata
