O : P : Q : R : S : T : U : V : W : X : Y : Z : ALL |
| Company | City | Phone | Web Site |
| Marathon/Ashland Petroleum | Russel | (606) 329-5257 x | |
| McGraw-Kokosing Construction | Middletown | 513-422-4521 x 4 | |
| Merck & Co, Inc. | Elkton | (540) 298-4876 | |
| Milliken | Marietta | (864) 836-1232 | |
| Mine Safety and Health Administration | Morgantown | 304-291-4277 | |
| Mine Safety and Health Administration | Mt. Hope | 304-877-3900 x-1 | |
| Mitre Corp. | Dumfries | (703) 441-1775 x | |
| MPL Corporation | Buchannon | ||