| Business | Phone |
| Aaron Security 4047 W 40th St, Chicago 60632 | (773) 847-0900 |
| Ahb Inc 4047 N Pontiac Ave, Chicago 60634 | (773) 625-9007 |
| Argus Services 123 W Madison St 1650, Chicago 60602 | (312) 922-6766 |
| Argus Services Inc 175 W Jackson Blvd A211, Chicago 60604 | (312) 922-4592 |
| Asap Process Svc & Invest 47 W Polk St 100, Chicago 60605 | (312) 339-2727 |
| Baker Eubanks Llc 30 S Wacker Dr, Chicago 60606 | (312) 580-9007 |
| Baker Street Detective Agency 205 W Wacker Dr 1220, Chicago 60606 | (312) 335-8277 |
| Cam Private Investigator 1036 N Dearborn St, Chicago 60610 | (312) 664-0334 |
| Ferret Diversified Svc Chicago 60602 | (847) 579-3200 |
| Falcon Investigators Inc 3200 N Lake Shore Dr, Chicago 60657 | (773) 549-7445 |
| Execupro Investigations 4442 S Berkeley Ave, Chicago 60653 | (773) 536-1936 |
| Elite Investigative Svc Po Box 6782, Chicago 60680 | (773) 723-8110 |
| Edmond S Power Agency 9056 S Hamilton Ave, Chicago 60620 | (773) 239-6999 |
| E L Johnson Investigations 53 W Jackson Blvd 915, Chicago 60604 | (312) 583-1167 |
| Chicagoland Detective Svc 2223 W Lyndale St 1r, Chicago 60647 | (773) 772-2651 |
| Don Hayworth Private Invstgtr Chicago 60611 | (312) 670-2560 |
| Cis Investigation Svc 900 W Jackson Blvd, Chicago 60607 | (312) 226-0384 |
| Definitive Investigative Svc 1630 W Estes Ave, Chicago 60626 | (773) 465-2797 |
| Darpis Investigations Inc 10450 S Vincennes Ave, Chicago 60643 | (773) 881-4764 |
| Comprehensive Investigative 6351 W Montrose Ave, Chicago 60634 | (773) 736-7233 |
| a 1 skiptracing 9049 S Carpenter St., Chicago 60620 | (708) 420-2531 |
| a 1 skiptracing 3400 W 111th St., Chicago 60655 | (708) 420-2531 |