| Business | Phone |
| Alion Science 30w250 Butterfield Rd 305, Warrenville 60555 | (630) 393-2214 |
| Alstrom Power 4525 Weaver Pkwy, Warrenville 60555 | (630) 393-9617 |
| R K & Assoc 2s631 Rt 59 B, Warrenville 60555 | (630) 393-9000 |
| Washington Group Intl 4320 Winfield Rd, Warrenville 60555 | (630) 836-1348 |
| Wendler Engineering Svc 29w170 Butterfield Rd, Warrenville 60555 | (630) 836-1035 |