| Business | Phone |
| Iowa Custom Machine 206 Edwards St, Waterloo 50703 | (319) 233-3918 |
| Accurate Gear & Machine Inc 2864 Burton Ave, Waterloo 50703 | (319) 233-1997 |
| Automotive Engine & Machine 123 Clark St, Waterloo 50703 | (319) 291-6569 |
| Selesky Manufacturing 339 Rath St, Waterloo 50703 | (319) 234-1388 |
| Stoddard Manufacturing 3244 Wagner Rd, Waterloo 50703 | (319) 235-0111 |
| Dettmer Industries Inc 824 Columbia St, Waterloo 50703 | (319) 232-7201 |
| Waterloo Screw Machine Product 822 Mulberry St, Waterloo 50703 | (319) 236-2854 |