| Code | Name | Region |
|---|---|---|
| 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 |
| USPMZ | Palmertown | PA |
| USPMT | Palmetto | FL |
| USPFP | Palmetto | GA |
| USP64 | Palmetto Bay | FL |
| USPQE | Palmetto, Bossier | LA |
| USPFM | Palmetto, Saint Landry | LA |
| US7PV | Palmview | TX |
| USPYA | Palmyra | IN |
| US8MY | Palmyra | ME |
| USXPM | Palmyra | MI |
| USPMR | Palmyra | MO |
| USP5M | Palermo | ME |
| USP3S | Palestine | AR |
| USZH4 | Palestine | IL |
| USPSN | Palestine | TX |
| USPDZ | Palisade | CO |
| USPDJ | Palisade | MN |
| USPDE | Palisade | NJ |
| USIAS | Palisades | NY |
| USPSA | Palisades Park | NJ |
| USPQM | Palm | PA |
| USPBY | Palm Bay | FL |
| USPAB | Palm Beach | FL |
| USPMG | Palm Beach Gardens | FL |
| USPMI | Palm City | FL |
| USPLM | Palm Coast | FL |
| USPMD | Palm Desert | CA |
| USXKI | Palm Harbor | FL |
| USPSP | Palm Springs | CA |
| USP2S | Palm Springs | FL |