- Primary Care Health Services,Inc.
- Primary Children's Hospital
- Primary Children's Hospital Transplant Program
- Primary Health Care Center of Dade, Inc.
- Primary Health Center Marshalltown Medical Clinic
- PrimaryOne Health
- Prime Line Power Equipment Products
- Primedia
- Primedia, Inc.
- Primedoc
- Prince George Associates, Inc.
- Prince George's County
- Prince Georges County, Maryland Conference and Visitors Bureau, Inc.
- Princess Royale
- Princeton Baptist Medical Center
- Princeton Community Hospital
- Princeton Courtyard by Marriott, Princeton, NJ
- Principal Financial Group - Des Moines
- Principal Financial Group - Hiawatha
- Printing Industries of America, Inc.
- Printis-McCullough and Associates
- Priority One Services, Inc.
- Prism and Associates Inc.
- Prisma Health
- Prisma Health Richland Hospital
- Prisma Health Tuomey
- Prison Fellowship
- Private Label Travel, Inc.
- PRL Central Laborator Services
- Pro Ski Instructors of America-Ski Patrol
- Pro-Com Systems
- Pro-Pak Industries
- Proceed Technical Resources, Inc.
- Procter and Gamble Company
- Proctor and Gamble Co.
- Produce Marketing Association
- Producers Co-Op
- ProEd Communications, Inc.
- Professional and Scientific Associates, Inc.
- Professional Association Management
- Professional Engineers of North Carolina
- Professional Examination Service
- Professional Golfers Association of America PGA)
- Professional Hospital Inc.
- Professional Mailing and Distribution Services
- Professional Marketing Services, Inc.
- Professional Meeting Management Services
- Professional Nursing Services
- Professional Photographers of America
- Professional Physical Therapy West Side