| Business | Phone |
| Actel Corp 1901 N Roselle Rd 800, Schaumburg 60195 | (847) 592-7001 |
| Future Electronics 2300 Barrington Rd 500, Schaumburg 60195 | (847) 490-9509 |
| Pyramid Broadcasting Schaumburg 60173 | (847) 517-4355 |
| Tocos America Inc 1177 Tower Rd, Schaumburg 60173 | (847) 884-6664 |
| Ml Technologies Llc 1890 N Roselle Rd 301, Schaumburg 60195 | (847) 885-8200 |
| Nu Horizons El 500 Remington Rd 104, Schaumburg 60173 | (847) 519-0700 |
| Usa Mobility Inc 800 N Plaza Dr, Schaumburg 60173 | (847) 240-1822 |
| Usa Mobility Inc 840 E State Pkwy, Schaumburg 60173 | (847) 882-1268 |
| Solid Sound Recording Studio 2400 Hassell Rd, Schaumburg 60194 | (847) 882-7446 |
| Superior Sound 2104 Stonington Ave, Schaumburg 60194 | (847) 843-7570 |
| Motorola Communications 1318 S Plum Grove Rd, Schaumburg 60196 | (847) 576-5760 |