| Business | Phone |
| Abc Fire & Burglar Alarm Co 8000 Broadway, Merrillville 46410 | (219) 769-8929 |
| Alert-Alarm Inc 1127 W Lincoln Hwy, Merrillville 46410 | (219) 738-2201 |
| Northern Indiana Alarm Co 6945 Broadway, Merrillville 46410 | (219) 736-6422 |
| Wired For Sound Inc 505 W 84th Dr, Merrillville 46410 | (219) 795-9473 |