| Abbreviation | Definition |
|---|---|
| OTR | Over-The-Road container |
| PA | Panama |
| PAF | Postal Address File |
| PAL | Parcel AirLift |
| PAL | Postal Answer Line |
| PAR | Program for Alcoholic Recovery |
| PAU | Platform Acceptance Unit |
| PAVE | Presort Accuracy Validation and Evaluation |
| PBC | Postal Business Center |
| PC | Post Card |
| PC | Postal Code |
| PCC | Postal Customer Council Program |
| PCD | Postcode |
| PCE | Postal Computing Environment |
| PCES | Postal Career Executive Service |
| PCM | Postal Commodity Machine |
| PDC/F | Processing and Distribution Center/Facility |
| PE | Peru |
| PE | Prince Edward island |
| PEDC | Postal Employee Development Center |