| Business | Phone |
| B-J Electric Supply Inc 805 Plaenert Dr, Madison 53713 | (608) 257-4777 |
| Werner Electric Supply 4428 Pflaum Rd, Madison 53716 | (608) 221-0090 |
| Crescent Electric Supply Co 1417 Wright St, Madison 53704 | (608) 241-2882 |
| Square D 700 Ray O Vac Dr 212, Madison 53711 | (608) 271-2600 |
| Standard Electric Supply Co 2750 Agriculture Dr, Madison 53718 | (608) 224-0999 |
| Graybar Electric Co 1301 W Badger Rd, Madison 53713 | (608) 255-0005 |
| Lappin Electric Co 2722 Progress Rd, Madison 53716 | (608) 223-9911 |
| Locus Inc 5540 Research Park Dr, Madison 53711 | (608) 270-0500 |