| Code | Name | Region |
|---|---|---|
| USPJB | Payson | AZ |
| USPYU | Payson | UT |
| USZPR | Pea Ridge | AR |
| USYPA | Peabody | KS |
| USPED | Peabody | MA |
| USPDA | Peace Dale | RI |
| USPSY | Peace Valley | MO |
| USYL2 | Peach Bottom | PA |
| USPCG | Peach Glen | PA |
| USPGS | Peach Springs | AZ |
| US7PC | Peacham | VT |
| USPD7 | Peachland | NC |
| USPVJ | Pauls Valley | OK |
| USPAU | Paulsboro | NJ |
| USUVY | Pauma Valley | CA |
| USP49 | Pavilion | NY |
| USP22 | Pavo | GA |
| USPW3 | Paw Creek | NC |
| USPPW | Paw Paw | MI |
| USUXT | Paw Paw | WV |
| USPWP | Pawcatuck | CT |
| USPWH | Pawhuska | OK |
| USPJW | Pawlet | VT |
| USZPI | Pawleys Island | SC |
| USPWL | Pawling | NY |
| USPWE | Pawnee | IL |
| USQAW | Pawnee | OK |
| USPWX | Pawnee City | NE |
| USPAW | Pawtucket | RI |
| USPX2 | Pax | WV |
| USPX6 | Paxico | KS |
| USPXS | Paxinos | PA |
| USP7A | Patterson | AR |
| USPCQ | Patterson | CA |
| USGPO | Patterson | GA |
| USZPA | Patterson | LA |
| USPNQ | Patterson | NC |
| USPAN | Patterson | NY |
| USPT2 | Patterson | WA |
| USDPS | Pattison | TX |
| USVQW | Patton | CA |
| USJZP | Patton | MO |
| USIQP | Pattonsburg | MO |
| USNHK | Patuxent River | MD |
| USPAZ | Paul | ID |
| USPD6 | Paulden | AZ |
| USPAD | Paulding | OH |
| USPUE | Pauline | KS |
| USZUI | Pauline | SC |
| US9AU | Paullina | IA |