| 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 |
| Bancare Inc | 6 E College Dr | Arlington Heights | IL | 60004 | (847) 394-1122 | (847) 394-0268 | www.bancare.net | |
| Fire & Security Systems Inc | 516 W Campus Dr | Arlington Heights | IL | 60004 | (847) 577-1950 | www.fssprotect.com | ||
| 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 | |
| Custom Residential Systems | 39 S Barrington Rd | South Barrington | IL | 60010 | (847) 705-5086 | (847) 705-5570 | www.customresidential.com | |
| Stand Guard Inc | 6110 Lou St | Crystal Lake | IL | 60014 | (815) 459-4444 | www.standguardinc.com | ||
| Broadview Security | 200 Howard Ave | Ste 292 | Des Plaines | IL | 60018 | (847) 294-0250 | (847) 294-0256 | www.broadviewsecurity.com |
| United Alarm Systems Inc | 1854 Johns Dr | Glenview | IL | 60025 | (847) 729-3900 | (847) 729-4790 | ||
| BS Inc | PO Box 534 | Grayslake | IL | 60030 | (888) 344-7979 | (847) 223-4150 | www.bs-inc.com | |
| Keyth Technologies Inc | 1575 Oakwood Ave | Highland Park | IL | 60035 | (847) 433-0000 | (847) 926-0008 | www.keyth.com | |
| Keyth Technologies | 1520 Berkeley Rd | Highland Park | IL | 60035 | (847) 433-0000 | (847) 926-0008 | www.keyth.com | |
| Keyth Technologies Inc | 1520 Berkeley Rd | Highland Park | IL | 60035 | (847) 433-0000 | (847) 926-0008 | ||
| 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 |
| ESSCOE LLC | 25741 N Hillview Ct | Mundelein | IL | 60060 | (847) 847-3200 | (847) 847-3201 | www.esscoe.com | |
| LaMarCo Systems Inc | 475 Lindberg Ln | Northbrook | IL | 60062 | (847) 239-7590 | (847) 239-7591 | www.lamarcosystems.com | |
| Sentry Alarms One Inc | PO Box 1103 | Sentry Square Ste 117 | Northbrook | IL | 60065 | (847) 205-0320 | www.sentrytel.com | |
| Jewell Electric Inc | PO Box 1098 | Waukegan | IL | 60079 | (847) 336-4919 | (847) 336-9121 | www.jewellelectric.com | |
| Sentry ABC Security | 339 Egidi Dr | Wheeling | IL | 60090 | (847) 353-7200 | (847) 353-7207 | www.abcsecurity.com | |
| Nitech Fire & Security Industries Inc | 109 Fairfield Way | Ste 305 | Bloomingdale | IL | 60108 | (630) 307-8805 | (630) 307-8842 | |
| Norcomm Public Safety Communications and Security | 395 W Lake St | Elmhurst | IL | 60126 | (630) 530-8871 | (630) 530-5099 | ||
| Renaissance Communication Systems Inc | 3509 Martens St | Franklin Park | IL | 60131 | (847) 671-1340 | (847) 671-9340 | www.rc-systems.com | |
| Santoro Communications Group Inc | 10114 Ashley St | Huntley | IL | 60142 | (847) 515-6269 | (847) 669-0785 | www.santorogroup.com | |
| Protection One Alarm Monitoring Inc | 2505 S Finley Rd | Ste 240 | Lombard | IL | 60148 | (630) 613-7870 | (630) 620-0229 | www.protectionone.com |
| Security Solutions Inc | 1850 S 25th Ave | Broadview | IL | 60155 | (708) 449-9900 | (708) 432-3115 | www.alarmchicago.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 | ||
| Stanley Security Solutions Inc | 590 Territorial Dr | Ste H | Bolingbrook | IL | 60440 | (630) 771-7760 | (630) 771-7772 | www.stanleyworks.com |
| Broadview Security | 13528 S Kenton | Crestwood | IL | 60445 | (708) 824-4060 | (708) 824-4070 | www.broadviewsecurity.com | |
| DMC Security Services Inc | 4455 W 147th St | Midlothian | IL | 60445 | (708) 388-6500 | (708) 388-6557 | www.dmcsecurity.com | |
| Quality Integrated Solutions | 8518 W 192 St | Mokena | IL | 60448 | (815) 464-4772 | (815) 464-0803 | www.qisinc.net | |
| Quinlan Alarm Systems Inc | 8940 W 192nd St | Ste J | Mokena | IL | 60448 | (708) 478-0707 | (708) 478-0333 | www.askquinlan.com |
| 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 | |
| Protech Security Systems Inc | 16262 Prince Dr | South Holland | IL | 60473 | (708) 339-4900 | (708) 339-4089 | www.protechsecuritycameras.com | |
| Goldy Locks Inc | 17048 Oak Park Ave | Tinley Park | IL | 60477 | (708) 532-6560 | (708) 633-4756 | www.goldylocksinc.com | |
| Aurora Tri-State Fire Protection | 1080 Corporate Blvd | Aurora | IL | 60502 | (630) 978-0600 | (630) 978-0940 | ||
| Alarm Detection Systems Inc | 1111 Church Rd | Aurora | IL | 60505 | (630) 844-6310 | (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 |
| Customized Protection Services Inc | 830 Warren Ave | Downers Grove | IL | 60515 | (630) 963-2410 | (630) 963-6305 | ||
| Stanley Convergent Security Solutions Inc | 2854 Hitchcock Ave | Downers Grove | IL | 60515 | (630) 724-3600 | (248) 669-0231 | www.stanleysecuritysolutions.com | |
| ADT Security Services Inc | 111 Windsor Dr | Oak Brook | IL | 60523 | (800) 238-2727 | (630) 586-0038 | www.adt.com | |
| Home Tech Mgmt Inc | 1212C Badger St | Yorkville | IL | 60560 | (630) 553-1353 | (630) 553-6377 | www.hometechmgmt.com | |
| Broadview Security | 612A W 5th Ave | Naperville | IL | 60563 | (630) 848-1430 | (630) 848-1453 | www.broadviewsecurity.com | |
| Stanley Convergent Security Solutions Inc | 55 Shuman Blvd | Ste 900 | Naperville | IL | 60563 | (630) 245-7100 | (630) 717-0987 | www.stanleysecuritysolutions.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 | (800) 248-8558 | (312) 922-8599 | www.unitedhq.com | |
| Keyth Technologies Inc | 872 N Franklin | Chicago | IL | 60610 | (847) 433-0000 | (847) 926-0008 | www.keyth.com | |
| Early Warning Alarms Inc | 7720 W Touhy Ave | Ste B | Chicago | IL | 60631 | (773) 763-2860 | (773) 763-2915 | |
| Alert Protective Services Inc | 3833 N Cicero | Chicago | IL | 60641 | (773) 685-8383 | (773) 545-8940 | ||
| Programmable Systems Inc | 1916 N Wilmot Ave | Chicago | IL | 60647 | (773) 252-7679 | (773) 252-7673 | ||
| Romeo Security Inc | PO Box 56538 | Chicago | IL | 60656 | (773) 625-1300 | (773) 625-9001 | ||
| Monarch Burglar Alarm Co | 6827 W Dobson St | Niles | IL | 60714 | (847) 965-6347 | |||
| Quality Alarm Systems Inc | 5532 W Cal Sag Rd | Alsip | IL | 60803 | (708) 389-7600 | (708) 389-7711 | ||
| Red Hawk Security Systems Inc | 12838 S Cicero Ave | Chicago | IL | 60803 | (708) 272-1160 | (708) 239-1690 | www.redhawk-us.com | |
| Reliable Fire Equipment Company | 12845 S Cicero Ave | Alsip | IL | 60803 | (708) 597-4600 | (708) 389-1150 | www.reliablefire.com | |
| Armal Alarm Corp | 14487 E Hemstock Rd | Rochelle | IL | 61068 | (815) 751-1587 | |||
| 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 | |
| ADT Security Services Inc | 5943 E Riverside | Rockford | IL | 61114 | (800) 238-2727 | www.adt.com | ||
| ADT Security Services Inc | 2800 46th Ave | Ste 2 | Rock Island | IL | 61201 | (800) 238-2727 | www.adt.com | |
| On Guard Security | 111 E 1st St | Geneseo | IL | 61254 | (309) 944-8084 | (309) 944-4406 | www.onguardil.com | |
| ADT Security Services Inc | 682 Highpoint Ln | Peoria | IL | 61611 | (800) 238-2727 | www.adt.com | ||
| Oberlander Alarm Systems Inc | 2216 W Altorfer Dr | Peoria | IL | 61615 | (309) 676-3535 | (309) 691-4447 | www.oberlanderalarms.com | |
| A-1 Alarm Services Inc | 208 S Chestnut St | Champaign | IL | 61820 | (217) 359-3914 | (217) 359-8354 | www.a-1alarm.com | |
| FE Moran Inc Alarm & Monitoring Services | 201 W University Ave | Champaign | IL | 61820 | (217) 403-6444 | (217) 403-6446 | www.femoranalarm.com | |
| Phone Masters LTD/Security Division | 523 N Old St Louis Rd | Woodriver | IL | 62095 | (618) 254-7330 | (618) 251-5130 | ||
| Barcom Inc | 923 N Belt W | Swansea | IL | 62226 | (618) 277-3344 | |||
| 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 |