| Code | Name | Region |
|---|---|---|
| US7CA | Penn Valley | CA |
| USPQQ | Penn Yan | NY |
| USPHW | Pelham | NY |
| USJPM | Pelham | TN |
| USPEX | Pelham Manor | NY |
| USPEC | Pelican | AK |
| USPQL | Pelican | LA |
| USIPI | Pelican Rapids | MN |
| USZE5 | Pelion | SC |
| USP37 | Pelkie | MI |
| USPLR | Pell City | AL |
| USPEL | Pella | IA |
| USPXN | Pellston | MI |
| USYPZ | Pelzer | SC |
| USPEM | Pemberville | OH |
| USPMB | Pembina | ND |
| USPM9 | Pembine | WI |
| USPBD | Pembroke | FL |
| USQPB | Pembroke | GA |
| USPBM | Pembroke | MA |
| USP8E | Pembroke | ME |
| USPWK | Pembroke | NC |
| USPK8 | Peck | MI |
| USPEK | Pecksville | NY |
| USPK2 | Peckville | PA |
| USQPN | Peconic | NY |
| USPEQ | Pecos | TX |
| USVPE | Peculiar | MO |
| USPJZ | Pedley | CA |
| USPKN | Pedricktown | NJ |
| USPDB | Pedro Bay | AK |
| USP2E | Peebles | OH |
| USZGF | Peekskill | NY |
| USEEZ | Peetz | CO |
| USPZJ | Pejepscot | ME |
| USPKI | Pekin | IL |
| USPKX | Pekin | IN |
| USPHE | Pelahatchie | MS |
| USAPM | Pelham | AL |
| USPEH | Pelham | GA |
| USEHF | Pelham | NC |
| USQPE | Pelham | NH |
| USPQH | Peachtree City | GA |
| USG9T | Peachtree Corners | GA |
| USEPU | Peapack | NJ |
| USPE6 | Pearce | AZ |
| USPE5 | Pearcy | AR |
| USEUX | Pearisburg | VA |
| USPES | Pearl | MS |
| USPEZ | Pearl City | IL |