| Code | Name | Region |
|---|---|---|
| USEJI | Petrolia | CA |
| USPEO | Petrolia | PA |
| USPYS | Perryopolis | PA |
| USXKQ | Perrysburg | OH |
| USPYV | Perrysville | OH |
| USEYN | Perryton | TX |
| USKPV | Perryville | AK |
| USPYI | Perryville | MD |
| USPYX | Perryville | MO |
| USPAY | Perth Amboy | NJ |
| USVYS | Peru | IL |
| USGUS | Peru | IN |
| USP6N | Peru | ME |
| USPGU | Peru | NY |
| US7PE | Peru | VT |
| USYPQ | Pescadero | CA |
| USP2N | Peshastin | WA |
| USPSH | Peshtigo | WI |
| USPT4 | Petal | MS |
| USPUM | Petaluma | CA |
| USYPB | Peterborough | NH |
| USPEE | Peterman | AL |
| USPR3 | Perkins | OK |
| USKDS | Perkinston | MS |
| USP9K | Perkinsville | VT |
| USKMV | Perkiomenville | PA |
| USPRI | Perrine | FL |
| USP7V | Perrineville | NJ |
| USPIO | Perrinton | MI |
| USPER | Perris | CA |
| USFPY | Perry | FL |
| USPYG | Perry | GA |
| USPRO | Perry | IA |
| US9PE | Perry | ME |
| USIPE | Perry | MI |
| USNYP | Perry | NY |
| USPQY | Perry | OH |
| USPRR | Perry | OK |
| USPY3 | Perry | SC |
| USWJ3 | Perry Hall | MD |
| USPYL | Perry Island | AK |
| USPYB | Perryman | MD |
| USJNL | Penwell | TX |
| USPEI | Peoria | AZ |
| USJPO | Peoria | IA |
| USPIA | Peoria | IL |
| USJP9 | Peoria | OH |
| USPHB | Peoria Heights | IL |
| USPST | Peosta | IA |
| USPJN | Peotone | IL |