| Business | Phone |
| Westford Communications 101 W Pitman St, O Fallon 63366 | (636) 978-7201 |
| T R & L Communications Llc 114 E Elm St # 4, O Fallon 63366 | (636) 240-1200 |
| Prante Communications Inc 3408 E Terra Ln, O Fallon 63366 | (636) 397-6554 |
| Custom Design Telephone Systs 927 E Terra Ln, O Fallon 63366 | (636) 281-2446 |