| Business | Phone |
| Air Link Communications 2930 Highway K, O Fallon 63368 | (636) 240-9710 |
| Automeris International 823 Lauralee Dr, O Fallon 63366 | (636) 281-1313 |
| Bening Communications Inc 4683 Highway K, O Fallon 63368 | (636) 300-9222 |
| Unity Communications Inc 2127 Mcgregor Cir, O Fallon 63368 | (636) 978-5747 |