| Business | Phone |
| A-Suburban Security Systems 6182 S Cass Ave, Westmont 60559 | (630) 964-1881 |
| Hide N See 109 N Hudson St, Westmont 60559 | (630) 852-4300 |
| High Rise Security Systems 762 Burr Oak Dr, Westmont 60559 | (630) 920-0100 |
| Kaybee Engineering Co 100 E Quincy St, Westmont 60559 | (630) 968-7100 |
| Magnet-Schultz Of America Inc 628 W 65th St, Westmont 60559 | (630) 969-8671 |
| Magnet-Schultz Of America Inc 401 Plaza Dr, Westmont 60559 | (630) 789-0600 |
| Mms Security Westmont 60559 | (630) 986-9514 |
| Oakwood Lighting & Electrical 407 W Ogden Ave, Westmont 60559 | (630) 493-4200 |
| Standby Power 77 W 61st St, Westmont 60559 | (630) 769-1138 |