| Business | Phone |
| 4501 W Augusta Llc 4500 W Chicago Ave, Chicago 60651 | (773) 394-3687 |
| A-Alert Lock Svc Chicago 60631 | (773) 774-8200 |
| Absolute Security Door & Wndws 12010 S Doty Ave, Chicago 60628 | (630) 264-3667 |
| Accurate Alarm Security 3448 W North Ave, Chicago 60647 | (773) 227-3389 |
| Aem Electronics Inc 3101 W 26th St, Chicago 60623 | (773) 254-2674 |
| Alliance Infotech & Security 345 N La Salle Dr, Chicago 60610 | (312) 245-1240 |
| Alliance Infotech Security 33 W Ontario St, Chicago 60610 | (312) 654-1436 |
| Authentica 1155 N Dearborn St, Chicago 60610 | (312) 787-3155 |
| Global Security Solutions Inc 2100 S Indiana Ave, Chicago 60616 | (312) 791-1630 |
| Brinks Security 919 S California Ave, Chicago 60612 | (773) 475-2600 |
| Burns Security 9261 S Western Ave, Chicago 60620 | (773) 239-1876 |
| First Security Svc Of Chicago 2600 S Michigan Ave, Chicago 60616 | (312) 842-4780 |
| Five Star Security Intl 111 E Chestnut St, Chicago 60611 | (312) 751-9822 |
| Castel Security Systems 6426 N Leavitt St, Chicago 60645 | (773) 531-4181 |
| Eprocess Solutions 2944 N Broadway St, Chicago 60657 | (773) 549-9907 |
| Checkfree Investment Svc 135 S La Salle St, Chicago 60603 | (312) 263-1406 |
| Electronic Systems Svc 4310 N Mobile Ave, Chicago 60634 | (773) 481-0383 |
| Elite Security Svc Inc 1109 W Taylor St, Chicago 60607 | (312) 433-0055 |
| Ecualarm Security Co 3001 W Lawrence Ave, Chicago 60625 | (773) 539-6302 |
| Chicago Spies 4407 N Milwaukee Ave, Chicago 60630 | (773) 205-6330 |
| Digitek Security 1828 W Webster Ave, Chicago 60614 | (773) 862-2400 |
| Communication Concepts Midwest 1903 N Milwaukee Ave, Chicago 60647 | (773) 787-7700 |
| Concepts Custom 2511 W 79th St, Chicago 60652 | (773) 434-7424 |
| Golden Pyramid Security Inc 10637 S Whipple St, Chicago 60655 | (773) 779-7095 |