| Code | Name | Region |
|---|---|---|
| USKPZ | Park | KS |
| US4PA | Panama | CA |
| USP99 | Panama | IA |
| US5PO | Panama | OK |
| USPFN | Panama City | FL |
| USZQV | Panama City Beach | FL |
| USPKO | Pandora | OH |
| USPNU | Panguitch | UT |
| USPHY | Panhandle, Carson | TX |
| USPH4 | Panhandle, Cass | TX |
| USP77 | Panora | IA |
| USPHQ | Panorama City | CA |
| USTEG | Pantego | NC |
| USTCG | Pantego | TX |
| USIPO | Paoli | IN |
| USVPI | Paoli | OK |
| USAOL | Paoli | PA |
| USWPO | Paonia | CO |
| USIOX | Papillion | NE |
| USPHU | Parachute | CO |
| USPD9 | Paradise | CA |
| USPBJ | Palmyra | NJ |
| USPZQ | Palmyra | NY |
| USPYY | Palmyra | PA |
| USPA7 | Palmyra | VA |
| USZPY | Palmyra | WI |
| US5PA | Palo | IA |
| USPAO | Palo Alto | CA |
| USFQO | Palo Cedro | CA |
| USPGZ | Palo Pinto | TX |
| USPXF | Palomar Mountain | CA |
| USP9H | Palos Heights | IL |
| USPH5 | Palos Hills | IL |
| USPP2 | Palos Park | IL |
| USPVP | Palos Verdes Estates | CA |
| USPZU | Palouse | WA |
| USPPA | Pampa | TX |
| USPPJ | Pamplico | SC |
| USQPM | Pamplin | VA |
| USPN2 | Pana | IL |
| USXPC | Panaca | NV |
| USZPF | Palmdale | FL |
| USPAQ | Palmer | AK |
| USPI8 | Palmer | IA |
| USPMX | Palmer | MA |
| USPL2 | Palmer | PA |
| USTPU | Palmer | TN |
| USGPA | Palmer | TX |
| USPE4 | Palmer Lake | CO |
| USPLA | Palmerton | PA |