| Business | Phone |
| Seidcom Inc 145 Vallecitos De Oro # G, San Marcos 92069 | (760) 722-4422 |
| Seidcon Inc 145 Vallecitos De Oro, San Marcos 92069 | (760) 510-9800 |
| Nasoft Usa 417 E Carmel St # 200, San Marcos 92078 | (760) 410-1210 |
| Gcas Inc 1531 Grand Ave # A, San Marcos 92078 | (760) 591-4227 |