| Business | Phone |
| Precision Systems 1530 Huntington Dr, Calumet City 60409 | (708) 891-4300 |
| S & K Security Corp 1120 Michigan City Rd, Calumet City 60409 | (708) 868-3403 |
| Plumbing & Electric Supply Co 642 Burnham Ave, Calumet City 60409 | (708) 862-1225 |
| Secure More Doors & Window 1501 Sibley Blvd, Calumet City 60409 | (708) 730-3667 |
| Stealth1.Com 736 Burnham Ave, Calumet City 60409 | (708) 862-6637 |
| Tri-Electronics 6231 Calumet Ave, Calumet City 60409 | (708) 862-4998 |