| Company Name | Street | Suite | City | St | Zip | Phone | Fax | Website |
| All Custom Electronics Inc | 417 E IL Rt 173 | Ste 106 PMB 123 | Antioch | IL | 60002 | (847) 254-1234 | (847) 356-2206 | www.allcustomelectronics.com |
| Fire & Security Systems Inc | 516 W Campus Dr | Arlington Heights | IL | 60004 | (847) 577-1950 | www.fssprotect.com | ||
| Bancare Inc | 6 E College Dr | Arlington Heights | IL | 60004 | (847) 394-1122 | (847) 394-0268 | www.bancare.net | |
| Arlington Security Company | 218 E Grove St | Arlington Heights | IL | 60005 | (847) 392-7997 | (847) 392-8232 | www.arlingtonsecurity.com | |
| Acadian Infinity Monitoring | 1533 Jarvis Ave | Elk Grove Village | IL | 60007 | (847) 879-8500 | (847) 879-8501 | www.infinitymonitoring.com | |
| Stand Guard Inc | 6110 Lou St | Crystal Lake | IL | 60014 | (815) 459-4444 | www.standguardinc.com | ||
| Keyth Technologies | 1520 Berkeley Rd | Highland Park | IL | 60035 | (847) 433-0000 | (847) 926-0008 | www.keyth.com | |
| Keyth Technologies Inc | 1575 Oakwood Ave | Highland Park | IL | 60035 | (847) 433-0000 | (847) 926-0008 | www.keyth.com | |
| Advanced Security Technologies Inc | PO Box 834 | Lake Zurich | IL | 60047 | (847) 540-9166 | (847) 540-9165 | www.advancedsecuritytechnologies.com | |
| Norshore Alarm Co Inc | 28085 N Ashley Cir | Ste 106 | Libertyville | IL | 60048 | (847) 367-7370 | (847) 549-1266 | www.norshorealarm.com |
| Norcomm Public Safety Communications and Security | 395 W Lake St | Elmhurst | IL | 60126 | (630) 530-8871 | (630) 530-5099 | ||
| Protection One Alarm Monitoring Inc | 2505 S Finley Rd | Ste 240 | Lombard | IL | 60148 | (630) 613-7870 | (630) 620-0229 | www.protectionone.com |
| Illini Security Systems Inc | 810 Albert Ave | Sycamore | IL | 60178 | (815) 895-2476 | (815) 895-9154 | www.alarm-u.com | |
| Sonitrol of Chicagoland West | 1275 W Roosevelt Rd | Ste 123 | West Chicago | IL | 60185 | (630) 293-4497 | (630) 293-5014 | |
| Chapman's Residential Security | 3705 Village Dr | Hazel Crest | IL | 60429 | (708) 798-1631 | (708) 798-1641 | ||
| Quality Integrated Solutions | 8518 W 192 St | Mokena | IL | 60448 | (815) 464-4772 | (815) 464-0803 | www.qisinc.net | |
| Knight Security Alarms | PO Box 1013 | New Lenox | IL | 60451 | (815) 485-4700 | (815) 485-4808 | ||
| Allcomm Systems | PO Box 755 | Orland Park | IL | 60462 | (708) 301-9146 | (708) 301-9716 | www.allcommsystem.com | |
| Alarm Detection Systems Inc | 1111 Church Rd | Aurora | IL | 60505 | (630) 844-6300 | (630) 844-6326 | www.adsalarm.com | |
| Electronic Security Systems Inc | 2112 W Galena Blvd | Ste 8112 | Aurora | IL | 60506 | (630) 896-2884 | (630) 579-5083 | www.ursecure.com |
| e.Norman Security Systems Inc | 1075 Shore Rd | Naperville | IL | 60563 | (630) 364-3600 | (630) 364-3609 | www.enormansecurity.com | |
| Father & Sons Home Service Inc | 3211 Oldwoods Dr | Naperville | IL | 60565 | (630) 985-3600 | (630) 985-8330 | ||
| D & I Electronics Inc | 24802 Caton Farm Rd | Plainfield | IL | 60586 | (815) 436-6003 | (815) 436-1457 | ||
| United Security Services Inc | 1550 S Indiana Ave | Chicago | IL | 60605 | (312) 922-8558 | (312) 922-8599 | www.unitedhq.com | |
| Keyth Technologies | 872 N Franklin St | Chicago | IL | 60610 | (847) 433-0000 | (847) 926-0008 | www.keyth.com | |
| Advanced Security Group | 2021 South Wabash Avenue | Chicago | IL | 60616 | (312) 881-9200 | (312) 881-9299 | www.iaschicago.net | |
| Alert Protective Services Inc | 3833 N Cicero | Chicago | IL | 60641 | (773) 685-8383 | (773) 545-8940 | www.alertprotective.com | |
| Programmable Systems Inc | 1916 N Wilmot Ave | Chicago | IL | 60647 | (773) 252-7679 | (773) 252-7673 | ||
| Monarch Burglar Alarm Co | 6827 W Dobson St | Niles | IL | 60714 | (773) 774-3411 | |||
| Reliable Fire Equipment Company | 12845 S Cicero Ave | Alsip | IL | 60803 | (708) 597-4600 | (708) 389-1150 | www.reliablefire.com | |
| Quality Alarm Systems Inc | 5532 W Cal Sag Rd | Alsip | IL | 60803 | (708) 389-7600 | (708) 389-7711 | ||
| Rockford Tech-Systems Inc | 3549 Merchandise Dr | Rockford | IL | 61109 | (815) 874-7786 | (815) 874-8029 | ||
| Per Mar Investigation Service Inc | 514 Loves Park Dr | Loves Park | IL | 61111 | (815) 636-3800 | (815) 636-3805 | www.permarsecurity.com | |
| Service Security Technologies Inc | 10462 Product Dr | Ste D | Machesney Park | IL | 61115 | (815) 877-9700 | www.servicesecurity.com | |
| On Guard Security | 111 E 1st St | Geneseo | IL | 61254 | (309) 945-4827 | (309) 944-4406 | www.onguardil.com | |
| Phone Masters LTD/Security Division | 523 N Old St Louis Rd | Woodriver | IL | 62095 | (618) 254-7330 | (618) 251-5130 | ||
| United Systems Inc | 1008 Jersey St | Quincy | IL | 62301 | (217) 228-0315 | (217) 228-0317 | www.4unitedsystems.com | |
| Southern Electronics & Telephone | 785 Blue Hole Rd | Harrisburg | IL | 62946 | (618) 252-7333 | (618) 252-4219 |