| Business | Phone |
| Northern Telecom Inc 491 Wrightwood Ave, Elmhurst 60126 | (630) 833-2475 |
| Sys-Cco 389 Alexander Blvd, Elmhurst 60126 | (630) 941-7711 |
| Ward Olson 110 Schiller St, Elmhurst 60126 | (630) 516-0771 |
| Web Site Svc 785 Parkside Ave, Elmhurst 60126 | (630) 782-5410 |