| Business | Phone |
| James Davey & Assoc 204 S 1st Ave, Yuma 85364 | (928) 782-7926 |
| Nicklaus Engineering Inc 1851 W 24th St, Yuma 85364 | (928) 344-8374 |
| Yuma Territorial Engineering 1420 S 5th Ave, Yuma 85364 | (928) 329-9097 |
| Arviso Engineering Inc 1044 E 21st St, Yuma 85365 | (928) 329-4695 |