| PCES | Pacific Coast Entomological Society 
| Others |
| PCES | Packet Cable Electronic Surveillance
| Others |
| PCES | Paradise Canyon Elementary School
| Others |
| PCES | Parent Child Educational Services
| Others |
| PCES | Parkersburg Catholic Elementary School
| Others |
| PCES | Pass Christian Elementary School
| Others |
| PCES | Peachtree City Elementary School
| Others |
| PCES | Pearre Creek Elementary School
| Others |
| PCES | Phenix City Elementary School
| Others |
| PCES | Pipeline Construction and Engineering Services
| Others |
| PCES | Pleasant Crossing Elementary School
| Others |
| PCES | Porter County Education Services
| Others |
| PCES | Post Crash Economics Society
| Others |
| PCES | Postal Career Executive Service
| Others |
| PCES | Prairie Creek Elementary School
| Others |
| PCES | Pre College for Engineering Systems
| Others |
| PCES | President's Commission on Environmental Sustainability
| Others |
| PCES | Professional Continuing Education Services
| Others |
| PCES | Project Cost Estimating System
| Others |
| PCES | Putnam County Elementary School
| Others |