| Business | Phone |
| Reclamation District 800 Hq 1540 Discovery Bay Blvd # A, Discovery Bay 94514 | (925) 634-2351 |
| Mobile Tracking Solutions 1944 Seal Way, Discovery Bay 94514 | (925) 516-0012 |
| Serrao Business Systems 3509 Catalina Way, Discovery Bay 94514 | (925) 634-7914 |
| Tutoring Club Inc 14870 Highway 4, Discovery Bay 94514 | (925) 513-7784 |