| Code | Name | Region |
|---|---|---|
| USPGH | Port Gamble | WA |
| USPGB | Port Gibson | MS |
| USYPV | Poplarville | MS |
| US7PO | Poquonock | CT |
| USQOS | Poquoson | VA |
| USPCK | Porcupine Creek | AK |
| USPTD | Port Alexander | AK |
| USPTC | Port Alice | AK |
| USPTG | Port Allegany | PA |
| USPAL | Port Allen | HI |
| USPLL | Port Allen | LA |
| USPTA | Port Alsworth | AK |
| USQPT | Port Alto | TX |
| USCLM | Port Angeles | WA |
| USTZS | Port Aransas | TX |
| USPTL | Port Armstrong | AK |
| USPOA | Port Arthur | TX |
| USKPY | Port Bailey | AK |
| USRTB | Port Barre | LA |
| USPBW | Port Bienville | MS |
| USPRY | Port Blakely | WA |
| USPOB | Port Bolivar | TX |
| USPZN | Ponder | TX |
| USPYF | Ponderay | ID |
| USPO7 | Ponsford | MN |
| USQPV | Ponte Vedra | FL |
| USP4V | Ponte Vedra Beach | FL |
| USPOI | Pontiac | IL |
| USPTK | Pontiac | MI |
| USPIB | Pontiac | SC |
| USPNB | Pontoon Beach | IL |
| USPOK | Pontotoc | MS |
| USYY2 | Pony | MT |
| USPOZ | Pooler | GA |
| US9PO | Poolville | TX |
| USPMP | Pope | MS |
| USPV9 | Pope Valley | CA |
| USPVY | Pope Vanoy | AK |
| USOPZ | Poplar | MT |
| USPOF | Poplar Bluff | MO |
| USOBZ | Poplar Branch | NC |
| US8AA | Poplar Grove | IL |
| USPOS | Polson | MT |
| USOYZ | Pomeroy | IA |
| USPX3 | Pomeroy | OH |
| US2PM | Pomeroy | PA |
| USPO6 | Pomeroy | WA |
| USPFR | Pomfret | CT |
| USO4F | Pomfret | MD |
| USPFF | Pomfret Center | CT |