Advanced Technological Investigations Ltd.
- Licensed investigation and security company. Youngstown.
- http://www.atipi.com/

Diversion Investigatrions
- Cincinnati-based private investigative agency; list of areas of practice and contact information provided.
- http://www.diversioninvestigations.com/

Advanced Research Services, Inc.
- Covering local areas of Cleveland, Akron, Youngstown, Willoughby and Canton.
- http://www.ohioinvestigators.com

InCamera Investigations, Inc.
- Serving Ohio and the nation from Vandalia.
- http://www.incamera.com/

Boerger Investigative Services, LLC.
- a full service private investigation agency serving all of Ohio.
- http://www.boergerpi.com