| Business | Phone |
| Advanced Communications Group 390 S Woods Mill Rd, Chesterfield 63017 | (314) 205-8668 |
| Telemanagement Assoc 14522 S Outer 40, Chesterfield 63017 | (314) 878-7175 |
| Mgic Telecommunications 691 Trade Center Blvd, Chesterfield 63005 | (636) 536-1296 |
| Designed Telecommunication Svc 618 Spirit Dr # 250, Chesterfield 63005 | (636) 530-8500 |