| Code | Name | Region |
|---|---|---|
| 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 |
| USPLC | Pearl City (oahu) | HI |
| USPEA | Pearl Harbor | HI |
| USPR8 | Pearl River | LA |
| USPAV | Pearl River | NY |
| USPND | Pearland | TX |
| USPTX | Pearlington | MS |
| USPEU | Pearsall | TX |
| USPEJ | Pearson | GA |
| USPS6 | Pearson | WI |
| USXPS | Pease | MN |
| USPBA | Pebble Beach | CA |
| USECT | Pecatonica | IL |
| USPAX | Paxson | AK |
| USPX9 | Paxton | FL |
| USPFB | Paxton | IL |
| US5XT | Paxton | MA |
| USPX4 | Paxville | SC |
| USPYE | Payette | ID |
| USPY2 | Payne | OH |
| USPYW | Paynesville | MN |