Illinois Investigative Solutions, Inc.
(630) 546-5405

• Investigators of Illinois Chicago, IL(773) 750-3214
• Suburban PI Inc.'s
  Aurora, IL
  (630) 966-9774
• RGH Investigations
  Chicago, IL
  (312) 981-8770

• National Investigations
  Channahon, IL
  (800) 798-5620
• Jay S Williams & Associates 
  (630) 879-1963
• All County Investigations and Process Serving, Inc.
  Elgin, IL ·Elgin Professional Building
  (847) 429-1790
• Lawrence Ryan Investigations, Inc. Oak Lawn, IL
  (847) 282-0996
• On Q Professional Investigations
  Chicago, IL
  (773) 697-4249
• Great Lakes Professional Investigations, LLC
  Naperville, IL · In Fox Run Square
  (630) 400-3333
• Verify Investigations - Private Detective and Investigator Service
  Chicago, IL · In Lobi Business Center
  (312) 204-7184
• Local Detectives.com Private Investigator
  (800) 231-3290
• Uthe & Uthe Inc
  Plainfield, IL
  (815) 577-9988
• A Private Investigator Inc
  Joliet, IL
  (815) 726-1830
• Lyght Detective Agency
  ​(847) 624-0627

National SIU
Private investigator
(800) 960-6748