| PHS | Hair Science 
| Others |
| PHS | Historic Services
| Others |
| PHS | Packaging, Handling, and Storage
| Others |
| PHS | Packet Handling System
| Others |
| PHS | Pakuranga Heights School
| Others |
| PHS | Palatine High School
| Others |
| PHS | Palisade High School
| Others |
| PHS | Palm Hotsync
| Others |
| PHS | Pampanga High School
| Others |
| PHS | Paperless Hospital Systems
| Others |
| PHS | Paradise High School
| Others |
| PHS | Parallel Hybrid System
| Others |
| PHS | Paramount High School
| Others |
| PHS | Park Heater System
| Others |
| PHS | Park Hill South
| Others |
| PHS | Parkersburg High School
| Others |
| PHS | Parking Help System
| Others |
| PHS | Parkland High School
| Others |
| PHS | Parowan High School
| Others |
| PHS | Parsippany High School
| Others |
| PHS | Party Hensei System
| Others |
| PHS | Pasadena High School
| Others |
| PHS | Pasadena Humane Society
| Others |
| PHS | Payload Handling Station
| Others |
| PHS | Payload Header Suppression
| Others |
| PHS | Peak Hour Service
| Others |
| PHS | Pediatric Home Service
| Others |
| PHS | Pendleton High School
| Others |
| PHS | Peninsula High School
| Others |
| PHS | Peninsula Humane Society
| Others |
| PHS | Pennsylvania Horticultural Society
| Others |
| PHS | Perry High School
| Others |
| PHS | Personal Handyphone System
| Others |
| PHS | Personal History Statement
| Others |
| PHS | Petaluma High School
| Others |
| PHS | Peterborough High School
| Others |
| PHS | Pewaukee High School
| Others |
| PHS | Phased Handset Series
| Others |
| PHS | Philadelphia Horticultural Society
| Others |
| PHS | Philomath High School
| Others |
| PHS | Phone Home Swiftly
| Others |
| PHS | Photo Studio
| Others |
| PHS | Physician Health Services
| Others |
| PHS | Physicians Health Study
| Others |
| PHS | Piedmont High School
| Others |
| PHS | Pinnacle High School
| Others |
| PHS | Pioneer High School
| Others |
| PHS | Pittsburgh Herpetological Society
| Others |
| PHS | Plainville High School
| Others |
| PHS | Plug-in Hybrid System
| Others |
| PHS | Pointy Haired Stupidvisor
| Others |
| PHS | Policy Holders' Surplus
| Others |
| PHS | Polson High School
| Others |
| PHS | Ponderosa High School
| Others |
| PHS | Pontiac HIgh School
| Others |
| PHS | Pontiac Historic Services
| Others |
| PHS | Pontiac Historical Services
| Others |
| PHS | Pontiac Historical Society
| Others |
| PHS | Porsche Holding Salzburg
| Others |
| PHS | port Hamiltonian system
| Others |
| PHS | Portage High School
| Others |
| PHS | Portola High School
| Others |
| PHS | Post Harvest Survey
| Others |
| PHS | Post High School
| Others |
| PHS | Post-Hypnotic Suggestion
| Others |
| PHS | Postal History Symposium
| Others |
| PHS | Pottsgrove High School
| Others |
| PHS | Poudre High School
| Others |
| PHS | Power Hint Service
| Others |
| PHS | Prattville High School
| Others |
| PHS | Pre Heater System
| Others |
| PHS | Pre Hibernation Syndrome
| Others |
| PHS | Predictive Hybrid Strategy
| Others |
| PHS | Presbyterian Healthcare Services
| Others |
| PHS | Presbyterian High School
| Others |
| PHS | Prescott High School
| Others |
| PHS | Press Hardening Steel
| Others |
| PHS | Preston High School
| Others |
| PHS | Primary Health System
| Others |
| PHS | Princeton High School
| Others |
| PHS | Printing Historical Society
| Others |
| PHS | Printing House Street
| Others |
| PHS | Priority Habitats and Species
| Others |
| PHS | Private Handsfree Software
| Others |
| PHS | Private Head Stone
| Others |
| PHS | Professional Hospital Supply
| Others |
| PHS | Prolene Hernia Solution
| Others |
| PHS | Prolene Hernia System
| Others |
| PHS | Prospect High School
| Others |
| PHS | Provo High School
| Others |
| PHS | Public Health Sciences
| Others |
| PHS | Public Health Service
| Others |
| PHS | Public Health Services
| Others |
| PHS | Public Health Solutions
| Others |
| PHS | Public High School
| Others |