| Business | Phone |
| Adb Hi-Tech Intl 1341 E 8th St # A2, National City 91950 | (619) 474-4710 |
| C & J Electronics Inc 1636 Wilson Ave, National City 91950 | (619) 477-1705 |
| Advanced Data Solutions 2605 Hoover Ave # F, National City 91950 | (619) 336-1400 |
| R2d2 Electronics Inc National City 91950 | (619) 434-9936 |
| Rakv Business Svc 1610 E 8th St, National City 91950 | (619) 477-9808 |
| Ralph Posadas Telecomm 3400 E 8th St, National City 91950 | (619) 327-0637 |
| Pcsworld.Net 49 N Euclid Ave, National City 91950 | (619) 263-0101 |
| Management Systems Provider 1247 Highland Ave, National City 91950 | (619) 336-0733 |
| Isc 41 E 12th St, National City 91950 | (619) 336-0571 |