| Business | Phone |
| B J Engineering & Surveying 1850 W Main St # G, El Centro 92243 | (760) 353-3552 |
| Development Design & Engineer 1122 W State St # D, El Centro 92243 | (760) 353-8110 |
| Holt Group Inc 1561 S 4th St, El Centro 92243 | (760) 337-3883 |
| Jbl Assoc 242 N 8th St, El Centro 92243 | (760) 352-2105 |
| Nolte Associates Inc 444 S 8th St # C1, El Centro 92243 | (760) 482-9300 |