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A-1 Detective Agency

(773) 985-4840
A-1 Detective Agency


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A-1 Detective Agency, Inc. is a full-service private investigation agency based in the Chicago Land area of Illinois, providing professional, confidential investigations and related services to clients throughout the State of Illinois.

We offer a wide range of professional services to law firms, insurance companies, businesses, organizations and private individuals, including criminal & civil investigations, missing person locates, background screening and more.

Your case is as important to us as it is to you and every case we conduct is handled with the highest level of professionalism, diligence and expedience. We utilize the latest information sources, equipment and investigative techniques available to help ensure we obtain the results you need.


  • Background Checks
  • Civil
  • Criminal
  • Due Diligence
  • Missing Persons
  • Process Service
  • People Locate / Skip Trace
  • Social Media
  • Surveillance

Service Guarantee

We provide quality and confidential investigations.

Areas of Coverage

  • Statewide Illinois


  • NDIA
  • NNA-Mobile Notary

Contact Info

Darryl Ellis
(773) 985-4840
1 East Erie Street, Suite 525-4448
Chicago, IL 60611

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Office Location

1 East Erie Street, Suite 525-4448
Chicago, IL
(773) 985-4840