| Code | Name | Region |
|---|---|---|
| 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 |
| USPJB | Payson | AZ |
| USPYU | Payson | UT |
| USZPR | Pea Ridge | AR |
| USYPA | Peabody | KS |
| USPED | Peabody | MA |
| USPDA | Peace Dale | RI |
| USPSY | Peace Valley | MO |
| USYL2 | Peach Bottom | PA |
| USPCG | Peach Glen | PA |
| USPGS | Peach Springs | AZ |
| US7PC | Peacham | VT |
| USPD7 | Peachland | NC |
| USPVJ | Pauls Valley | OK |
| USPAU | Paulsboro | NJ |
| USUVY | Pauma Valley | CA |
| USP49 | Pavilion | NY |
| USP22 | Pavo | GA |
| USPW3 | Paw Creek | NC |
| USPPW | Paw Paw | MI |
| USUXT | Paw Paw | WV |
| USPWP | Pawcatuck | CT |
| USPWH | Pawhuska | OK |
| USPJW | Pawlet | VT |
| USZPI | Pawleys Island | SC |
| USPWL | Pawling | NY |
| USPWE | Pawnee | IL |
| USQAW | Pawnee | OK |
| USPWX | Pawnee City | NE |
| USPAW | Pawtucket | RI |
| USPX2 | Pax | WV |