| Business | Phone |
| Park Electric Controls Inc 16866 Roys Rd, Constantine 49042 | (269) 342-1068 |
| Byler Electric 550 Florence Rd, Constantine 49042 | (269) 435-7156 |
| Miller Electric 19512 Wittenberg Rd, Constantine 49042 | (269) 435-7658 |
| Windcrest Electric & Heating 65164 Youngs Prairie Rd, Constantine 49042 | (269) 435-7475 |
| Tech Inc 62937 Constantine Rd, Constantine 49042 | (269) 435-7443 |