| Webb | Cleveland | OH |
| Webb | East Liverpool | OH |
| Webster Manufacturing | Tiffin | OH |
| Wehner Brewing | Dayton | OH |
| Wehrle | Newark | OH |
| Weidman | Cleveland | OH |
| Weir Frog | Cincinnati | OH |
| Weir Frog | Norwood | OH |
| Weirton Steel | Steubenville | OH |
| Weiskopf Division | Cincinnati | OH |
| Weiss Industries | Mansfield | OH |
| Welco Industries | Cincinnati | OH |
| Welded Ring | Cleveland | OH |
| Weldinghouse | Cleveland | OH |
| Weldon Rubber | Warren | OH |
| Weld Rod Department | Barberton | OH |
| Wellman | Cleveland | OH |
| Wellman Engineering | Cleveland | OH |
| Wellman Leaver Engineering | Cleveland | OH |
| Wellman-McDowell | Cleveland | OH |
| Wellman Power & Gas | Green Springs | OH |
| Wellman-Seaver-Morgan | Akron | OH |
| Wellman-Seaver-Morgan | Cleveland | OH |
| Wellston Furnace | Wellston | OH |
| Wellston Iron Furnace | Wellston | OH |
| Wellston Municipal Electric Plant | Wellston | OH |
| Wellston Steel & Iron | Wellston | OH |
| Wellsville Foundry | Wellsville | OH |
| Wellsville Plate & Sheet Iron | Wellsville | OH |
| Welton Rubber | Warren | OH |
| W.E. Plechaty | Cleveland | OH |
| Werner | Akron | OH |
| Werner G. Smith | Cleveland | OH |
| West 40th Street School | Lorain | OH |
| West Carrolton Parchment | West Carrollton | OH |
| West Clermont Company Consol. School | Amelia | OH |
| Westcott Motor Car | Springfield | OH |
| West End Lumber | Portsmouth | OH |
| Western Bowl | Cincinnati | OH |
| Western Conduct Manufacturing | Youngstown | OH |
| Western Controls | Willoughby | OH |
| Western Electric | Solon | OH |
| Western Electric | Columbus | OH |
| Western Enterprise | Avon Lake | OH |
| Western Hills High School | Cincinnati | OH |
| Western Hills Pumping Station | Cincinnati | OH |
| Western Mineral Wool | Cleveland | OH |
| Western Ohio Railroad | Saint Marys | OH |
| Western Ohio Railroad | Akron | OH |
| Western Reserve Care System | Youngstown | OH |
