| Code | Name | Region |
|---|---|---|
| USQPL | Palmdale | CA |
| USPGO | Pagosa Springs | CO |
| USPHK | Pahokee | FL |
| USPQV | Pahrump | NV |
| USZQ3 | Paicines | CA |
| USPMU | Paimiut | AK |
| USXXQ | Paincourtville | LA |
| USPVZ | Painesville | OH |
| USP5R | Paint Rock | AL |
| USPWY | Painted Post | NY |
| USPE9 | Painter | VA |
| USPCE | Painter Creek | AK |
| USPAI | Paintsville | KY |
| USPY6 | Paisley | FL |
| USAJO | Pajaro | CA |
| USJPL | Pala | CA |
| USPSX | Palacios | TX |
| USPLE | Palatine | IL |
| USPBE | Palatine Bridge | NY |
| USPLT | Palatka | FL |
| USPV8 | Palenville | NY |
| USPCZ | Pace | FL |
| USZE4 | Pacheco | CA |
| USPCW | Pachuta | MS |
| USAC3 | Pacific | MO |
| USPF8 | Pacific | WA |
| USPFC | Pacific City | OR |
| USICG | Pacific Grove | CA |
| USPJ8 | Pacific Junction | IA |
| USPPH | Pacific Palisades | CA |
| USPFQ | Pacifica | CA |
| USPBK | Pack Creek | AK |
| USPUQ | Pacoima | CA |
| USZG9 | Pacolet | SC |
| USPCY | Paden City | WV |
| USPAH | Paducah | KY |
| USXKG | Paducah | TX |
| USPFA | Paf Warren | AK |
| USPGA | Page | AZ |
| USPGE | Pagedale | MO |
| USPQR | Pageland | SC |
| USOSF | Oxford | NE |
| USOXW | Oxford | NJ |
| USOX3 | Oxford | NY |
| USOXD | Oxford | OH |
| USZXO | Oxford | PA |
| USOFQ | Oxford | WI |
| USOXY | Oxly | MO |
| USOXN | Oxnard | CA |
| USOXR | Oxnard-ventura Apt | CA |