| Business | Phone |
| Midwest Technical Sales 23 Briarwood S, Oak Brook 60523 | (630) 655-6330 |
| Oakbrook Center Mall Security 100 Oakbrook Ctr, Oak Brook 60523 | (630) 573-0717 |
| Protection One Inc 600 Hunter Dr 101, Oak Brook 60523 | (630) 472-0179 |
| Security Services & Tech 2311 W 22nd St 110, Oak Brook 60523 | (630) 928-1011 |
| Securitylink From Ameritech 111 Windsor Dr, Oak Brook 60523 | (630) 572-0431 |
| Sure Guard Security Inc 900 Jorie Blvd, Oak Brook 60523 | (630) 368-9050 |
| Tamini Transformers Usa 2803 Butterfield Rd, Oak Brook 60523 | (630) 368-9907 |