| Waltz Furnace | Cincinnati | OH |
| Warder, Bushnell & Glessner | Springfield | OH |
| Wardlow Thomas & Company | Middletown | OH |
| Ward Low Thomas Paper | Middletown | OH |
| Warner Collieries | Wolf Run | OH |
| Warner & Swasey | Cleveland | OH |
| Warnick & Justus | Massillon | OH |
| Warren City Hall | Warren | OH |
| Warren City Tank & Boiler | Warren | OH |
| Warren Consolidated | Warren | OH |
| Warren Dock | Warren | OH |
| Warren Electric Manufacturing | Sandusky | OH |
| Warren Municipal Building | Warren | OH |
| Warren Pump & Supply | Warren | OH |
| Warren Steel | Warren | OH |
| Warren Tool | Warren | OH |
| Warren Water & Light | Warren | OH |
| Warren Works | Warren | OH |
| Washington Gas & Light | Washington Court House | OH |
| Washington High School | Canton | OH |
| Washington School | Springfield | OH |
| Wastewater Treatment Plant | Gahanna | OH |
| Wastewater Treatment Plant | Minerva | OH |
| Water Department | Bellefontaine | OH |
| Water Treatment Plant | Greenfield | OH |
| Water Works | Kenton | OH |
| Waterworks Booster Station | Wooster | OH |
| Water Works & Electric Light | Napoleon | OH |
| Water Works, Kirkland Street Pumping Station | Cleveland | OH |
| Water Works & Light Plant | Springfield | OH |
| Water Works Pumping Station | Salem | OH |
| Water Works Pumping Station | Dayton | OH |
| Wationalworks | Cleveland | OH |
| Watteredge-Uniflex | Avon Lake | OH |
| Watt Mining Car Wheel | Barnesville | OH |
| Wausaw Mosinee | Middletown | OH |
| Wauseon Water Plant | Wauseon | OH |
| Wayne | Steubenville | OH |
| Wayne County Joint Voc Sch | Smithville | OH |
| Wayne Dalton | Columbus | OH |
| Wayne Mining | Cambridge | OH |
| W.B. Cowles | Cleveland | OH |
| W. Bingham | Cleveland | OH |
| W.B. Oglesby Paper | Middletown | OH |
| W.B. Pallock | Youngstown | OH |
| Wcet-Tv | Cincinnati | OH |
| Wci Steel | Warren | OH |
| Wean United | Youngstown | OH |
| Wean United | Canton | OH |
| Wearn Building University Hospital | Cleveland | OH |
