| Business | Phone |
| Cti Environmental Inc 100 Lincoln Way E, Massillon 44646 | (330) 834-9960 |
| Fritz Brothers Engineering 3642 Pigeon Run Rd Sw, Massillon 44647 | (330) 833-7980 |
| Seifert & Assoc Inc 2323 Nave Rd Se, Massillon 44646 | (330) 833-2700 |
| Marott Engineering 1950 Amherst Rd Ne, Massillon 44646 | (330) 499-9550 |