​Lawrence Ryan Investigations
"Corruption Watch USA's personal recommendation!" 
https://lawrenceryaninvestigations.com
312-647-2017

Investigators of Illinois
http://www.investigators-il.com
[email protected] ; 773-750-3214

Arkus Inc
5 Revere Drive Suite 200 Northbrook , IL 60062
https://www.arkusinvestigators.com; 1-847-205-1030

Suburban PI Inc.'s
1700 N Farnsworth Ave. Suite 12 Aurora, IL http://suburbanpi.com 1-630-966-9774;
[email protected]

Jim Zarnick, Licensed Private Investigator
2863 W. 95th Street, Suite 143, Naperville, IL http://jzinvestigations.com; 1-630-820-5990
[email protected]

Viper Detective Agency
134 W. Lake Street Suite 100-9 Bloomingdale, IL 60108
http://www.viperdetectiveagency.com 1-630-307-7482;
[email protected]
​
​Blue Star Investigation
https://bluestarinv.com; 1-224-636-1774
[email protected]

Barrister Investigations
212 N Chicago St , 3rd Floor Joliet IL
www.barristerillinois.com; 1-815-306-3310
[email protected]

National Investigations
National Investigations, Inc.P.O.
​Box 254 Channahon, IL
https://www.nationalinvestigations.com
1-800-798-5620 ext. 111
[email protected]

[email protected]

Uthe & Uthe Inc.
​"Another one Corruption Watch USA Reccomends"
Plainfield, IL · In CATON CROSSINGS
http://www.utheinvestigations.com
(815) 577-9988; [email protected]

​Heritage Investigations & Surveillance
123 W Madison St. Chicago, IL 60602
http://privateinvestigatorchicago.com
[email protected]
Chicago 1-312-987-1828
North Suburbs 1-847-236-1828
West Suburbs 1-630-588-1828
Peoria 1-309-431-1290
Northwest IL: 779-216-8798

On Q Professional Investigations
3004 W Belmont Ave. Chicago, IL 60618
http://www.onqpi.com; 1-773-697-4249
[email protected]

Carlson Investigations, Inc
1555 Sherman Ave. Suite 306, Evanston IL https://www.carlsoninvestigationsinc.com 
1-847-491-9182
[email protected]​

​Bill Clutter Investigations
1 W Old State Capitol Plz Ste 818, Springfield
www.clutterinvestigations.com
1-217-528-5997

A Private Investigator Inc
54 N Ottawa St Ste 305, Joliet 
www.apiami.com 1-815-726-1830 ; [email protected]

Verify Investigations
1655 S. Blue Island Ave., Suite 314 Chicago IL 60608
verifypi.com 1-312-204-7184; [email protected]

Great Lakes Professional Investigations, LLC
1212 South Naper Blvd.Suite 119, Box 256​ Naperville IL
https://greatlakespi.com; 1-630-400-3333

Search Investigations, Inc
Glen Ellyn, IL 
https://searchinvestigationsinc.com; 1-630-890-1340
[email protected]; 

Impact Investigations, Inc
Westmont, IL www.iiinow.com;
(630) 574-8450   [email protected]
Chicagoland Detective Services Inc
4425 W. Irving Park Road, Front 1, Chicago, IL 60641
http://chicagolanddetectiveservices.com
1-773-772-2651; [email protected]

MSI Detective Services
DBA MSI Detective Services
2406 W Fullerton Ave, Chicago, IL 60647
1-773-404-7400; [email protected]

North Suburban Chicago
5627 Dempster St. Morton Grove, IL 60053
https://detectiveservices.com
1-773-404-7400; [email protected]

Paladin Jordan Detective Agency (PJDA)
​25 N. River Lane, Suite 427, Geneva, Illinois 60134
https://www.pjda.net; 1-312-600-0311
[email protected] 

H. Brown Investigations, Ltd.
362 Lake St. Antioch, IL 60002-1404
https://www.brownprivateinvestigators.com
[email protected]

Edward R Kirby & Associates Inc
909 South Illinois Route 83 Suite 103 Elmhurst IL
http://www.kirbyinvestigations.com
1-630-941-1700 
[email protected]