- Ohio Veterinary Medical Association
- OhioHealth Berger Hospital
- OhioHealth Mansfield Hospital
- OhioHealth Marion General Hospital
- Ohiohealth O'Bleness Hospital
- OhioHealth Riverside Methodist Hospital
- OhioHealth Southeastern Medical
- OMNOVA Solutions, Inc.
- OnBase, Hyland Software Inc.
- OneTouch Technologies Corporation
- Oregon Business District Association
- Orrville Area United Way, Inc.
- Otterbein University
- Owens Community College
- Owens Corning
- Panera Bread
- Parker Hannifin Corp.
- Paxar Monarch
- Pediatric Clinical Trials International, Inc.
- Penton Media, Inc.
- Philips
- Phoenix Manufacturing Company, Inc.
- Pike County United Fund, Inc.
- Pipefitters Local 120
- Plansoft Corporation
- Plumbers, Local 55
- Precision Machined Products Association
- Precision Printing
- Prescription Relief
- PrimaryOne Health
- Pro-Pak Industries
- Procter and Gamble Company
- ProEd Communications, Inc.
- Progressive
- Prologue Research
- ProMedica Bay Park Hospital
- ProMedica Flower Hospital
- ProMedica Toledo Hospital and Toledo Children's Hospital
- Quality Hotel Conference Center Cincinnati Blue Ash
- Quality Inn East
- Radisson Hotel at the University of Toledo
- Radisson Hotel Columbus - Airport, Columbus, OH
- Red Roof Inn
- Red's Rollen Garage Inc.
- RegalCare
- Rets Tech Center
- Reynolds and Reynolds
- Robert Taylor Agency
- Rogers Krajnak Architects
- RPM International Inc.