| Business | Phone |
| Altone Services Inc Antioch 94509 | (925) 753-5520 |
| Quick Qualifier Software 3900 Folsom Dr, Antioch 94531 | (925) 753-1152 |
| Software Etc 2550 Somersville Rd # 14, Antioch 94509 | (925) 706-0488 |
| Symmetry Corp 1904 Mount Powell Ct, Antioch 94531 | (925) 783-0884 |
| Tech Plus Computers 5164 Cutler Ct, Antioch 94531 | (925) 277-1111 |