| Business | Phone |
| Crescent Electric Supply Co 2405 Westfield Ave, Waterloo 50701 | (319) 234-6866 |
| Electrical Engineering & Equip 183 W 9th St, Waterloo 50702 | (319) 234-4000 |
| Farnsworth Electronics 201 E Mullan Ave, Waterloo 50703 | (319) 234-6681 |
| Van Meter Industrial 125 Courier St, Waterloo 50701 | (319) 235-9313 |