| White Superior Division White Motor | Springfield | OH |
| Whiting | Lima | OH |
| Whitman & Barnes Manufacturing | Akron | OH |
| Whitman & Barnes Manufacturing | Canton | OH |
| Whitmore Robinson & Company | Akron | OH |
| Whittier Junior High School | Lorain | OH |
| WHK Broadcasting Studio | Cleveland | OH |
| W.H. Kiefaber | Dayton | OH |
| W. H. Sammis Power Plant | Stratton | OH |
| Wickes Boiler | North Canton | OH |
| Wickliffe Coal | Eastlake | OH |
| Widlar | Cleveland | OH |
| Widows & Orphans Home | Cincinnati | OH |
| Wielys Overland | Toledo | OH |
| Wilberforce University | Wilberforce | OH |
| Wildcraft Products | Dayton | OH |
| Wilfred Sykes | Lorain | OH |
| Wilkins Air Force Base | Shelby | OH |
| Wilkoff S & Sons | Cleveland | OH |
| Willard Storage Battery | Cleveland | OH |
| William B. Pollock | Youngstown | OH |
| William Focke's Sons | Dayton | OH |
| William G. Solt | Cincinnati | OH |
| William Hamilton Sons Car | Newark | OH |
| William H. Conklin | Columbus | OH |
| William H. Zimmer Power Plant | Moscow | OH |
| William Lay Company, 2501 Lay Drive | Akron | OH |
| William Manufacturing | Portsmouth | OH |
| William Powell | Cincinnati | OH |
| William Reiss Steamship | Cleveland | OH |
| Williams Brothers | Kent | OH |
| William S. Merrell | Reading | OH |
| Willis Music | Cincinnati | OH |
| Willoughby High School | Willoughby | OH |
| Willoughby Works | Willoughby | OH |
| Willson Dairy | Cincinnati | OH |
| Willys Motors | Toledo | OH |
| Willys-Overland | Toledo | OH |
| Willys-Overland | Elyria | OH |
| Wilmington High School | Wilmington | OH |
| Wilson & McCallay | Middletown | OH |
| Wilson Rubber | Canton | OH |
| Wiltsie Realty | Toledo | OH |
| Winnen Incinerator | Bedford | OH |
| Winton Forest School | Cincinnati | OH |
| Winton Heat | Cleveland | OH |
| Winton Heat | Rocky River | OH |
| Winton Hill Technical Center | Cincinnati | OH |
| Winton Motor Carriage | Cleveland | OH |
| Winton Place School | Cincinnati | OH |
