| Aeroquip Republic Rubber | Youngstown | OH |
| Aerospace America Inc | Cleveland | OH |
| A.E. Staley Manufacturing | Decatur | OH |
| A.E. Staley Manufacturing | Painesville | OH |
| A.E. Staley Manufacturing | Grand River | OH |
| Aetna Iron & Steel | Bridgeport | OH |
| Aetna Paper | Dayton | OH |
| Aetna Rubber | Ashtabula | OH |
| Aetna Rubber | Cleveland | OH |
| Aetna Rubber | Sandusky | OH |
| Aetna Standard Iron & Steel | Bridgeport | OH |
| Aetna Standard Iron & Steel | Mingo Junction | OH |
| Aetna Welding | Cleveland | OH |
| A. Gottlieb Container | Cincinnati | OH |
| A. H. Pugh Printing | Cincinnati | OH |
| A & I | Marietta | OH |
| Airco | Cleveland | OH |
| Airco | Sandusky | OH |
| Aircraft Braking Systems | Akron | OH |
| A.I. Research | Newark | OH |
| Air Injector | Cleveland | OH |
| Air National Guard Facilities | Columbus | OH |
| Air Nitrate | Ancor | OH |
| Air Nitrate | Toledo | OH |
| Air Nitrate | Cincinnati | OH |
| A.I. Root | Medina | OH |
| Air Traffic Control Center | Fairfield | OH |
| Air Traffic Control Center | Oberlin | OH |
| Ajax Magnethermic | Warren | OH |
| Ajax Manufacturing | Euclid | OH |
| A.J. Phipps | Canton | OH |
| A.K. Property | Canton | OH |
| A.K. Property | Wooster | OH |
| Akron, Bedford & Cleveland Railway | Cuyahoga Falls | OH |
| Akron, Bedford & Cleveland Railway | Cleveland | OH |
| Akron, Bedford & Cleveland Railway | Bedford | OH |
| Akron Brewing | Akron | OH |
| Akron Childrens Hospital | Akron | OH |
| Akron City Hospital | Akron | OH |
| Akron & Cuyahoga Falls R.I. | Akron | OH |
| Akron & Cuyahoga Falls R.I. | Cuyahoga Falls | OH |
| Akron Defense Plant | Akron | OH |
| Akron Electric | Akron | OH |
| Akron Gas | Akron | OH |
| Akron Gasket | Tallmadge | OH |
| Akron General Hospital | Akron | OH |
| Akron Heating & Ventilating | Akron | OH |
| Akron Iron | Akron | OH |
| Akron Milling Mining & Manufacturing | Akron | OH |
| Akron Oxygen | Willoughby | OH |
