| Power Electronics Research Centre | Academic & Science |
| Perchloroethylene | Academic & Science |
| Property and Environment Research Center | Academic & Science |
| Plumbing Efficiency Research Coalition | Academic & Science |
| Programmable Electrical Rule Checking | Academic & Science |
| Property Environment Research Center | Academic & Science |
| Private Enterprise Research Center | Academic & Science |
| Princeton Environmental Reform Committee | Academic & Science |
| Physiology Educational Research Consortium | Academic & Science |
| Political Economy Research Center | Academic & Science |
| Polaris Electronic Reverse Control | Academic & Science |
| Professional English Research Consortium | Academic & Science |
| Policy Evaluation And Research Center | Academic & Science |
| Printed Electronics Research Collaborative | Academic & Science |
| Poultry Education and Research Center | Academic & Science |
| Pharmaceutical Education Research Center | Academic & Science |
| Postsecondary Education Research Center | Academic & Science |
| Paisley Enterprise Research Centre | Business |
| Penobscot Energy Recovery Company | Business |
| Palisades Emergency Residence Corporation | Business |
| Positive Employee Relations Council | Business |
| Pittsfield Economic Revitalization Corporation | Business |
| Political and Economic Risk Consultancy | Business |
| Tetrachloroethylene | Chemistry |
| Pittsburgh Education Recruitment Consortium | Community |
| PROPANE Education and Research COUNCIL | Community |
| Pacific Environment And Resources Center | Community |
| Parent Education Resource Center | Community |
| Percussion | Community |
| Propane Education Research Council | Community |
| Physics Education Research Conference | Community |
| Perth East Recreation Complex | Community |
| Pain Education Resource Center | Community |
| Piedmont Educator Renewal Conference | Community |
| Physical Education and Recreation Center | Community |
| Pesticide Educational Resources Collaborative | Community |
| Power Edge Raid Controller | Computing |
| Power Edge Expandable Raid Controller | Computing |
| Passivated Emitter Rear Contact | Contact |
| Public Employment Relations Commission | General |
| Peer Enabled Restructured Classroom | General |
| Passivated Emitter and Rear Cell | General |
| Pressurized Exhaust Rodent Control | General |
| Powered Emercency Release Coupler | General |
| Performance Efficiency Reliability and Capacity | General |
| Parents Encouraging Responsible Choices | General |
| Parent Edudcation Resource Center | General |
| Peace And Environment Resource Centre | General |
| Public Earthquake Resource Center | General |
| Privacy Enhanced RTP Conferencing | General |
| Passivated Emitter Rear Cell | General |
| Psychosis Evaluation Recovery Center | General |
| Professionalism Efficiency Respect and Common | General |
| Post Enrollment Requisite Checking | General |
| Preservation Ecological Recreation Community | Governmental |
| Permanent Employee Registration Card | Governmental |
| Public Employee Retirement Commission | Governmental |
| Public Employees Relations Commission | Governmental |
| Pennsylvania Environmental Resource Consortium | Governmental |
| Public Employment Relations Commission (Washington) | Governmental |
| Petroleum Exporting Regional Countries | Governmental |
| Pageprinceton Environmental Reform Committee | Governmental |
| Plant Environmental Research Center | Governmental |
| Permanent Employment Registration Card | Governmental |
| Performance Evaluation Research Center | Jobs |
| Pulmonary Embolism Rule-out Criteria | Medical |
| Portable Executive for Reliable Control | Networking |
| Prince Edward Radio Club | Radio Science |
| Pediatric Emergency Research Canada | Regional |
| Pan-European Regional Council | Regional |