| Business | Phone |
| Electro-Graph Inc 2365 Camino Vida Roble, Carlsbad 92009 | (760) 438-9090 |
| Romer Inc 5145 Avenida Encinas, Carlsbad 92008 | (760) 438-1725 |
| Power Semiconductors-Inc 6189 El Camino Real # 5, Carlsbad 92009 | (760) 931-9177 |
| Oyo Instruments 2965 Lexington Cir, Carlsbad 92010 | (760) 730-3518 |
| Fosport Industries Inc 3210 Azahar Pl, Carlsbad 92009 | (760) 942-7261 |
| Home Office Annex 7073 Tatler Rd, Carlsbad 92011 | (760) 929-9876 |
| Imagerlabs 5651 Palmer Way, Carlsbad 92010 | (760) 602-9448 |