| Code | Name | Region |
|---|---|---|
| USPTM | Portsmouth | VA |
| USVTP | Portville | NY |
| USOG9 | Portage | OH |
| USPJG | Portage | PA |
| USXKX | Portage | WI |
| USPCA | Portage Creek | AK |
| USP3L | Portage Lake | ME |
| USPGI | Portageville | MO |
| USZPT | Portageville | NY |
| USP8T | Portal | GA |
| USPQT | Portal | ND |
| USPXM | Portales | NM |
| USPWO | Porter | IN |
| US8PO | Porter | ME |
| USEQR | Porter | MN |
| USPXE | Porter | TX |
| USTC5 | Porter Corners | NY |
| USPO4 | Porter Ranch | CA |
| USPOD | Porterdale | GA |
| USJRW | Portersville | PA |
| USPTV | Porterville | CA |
| USPJL | Porthill | ID |
| USRI4 | Port Richmond | PA |
| USPRJ | Port Royal | SC |
| USPSJ | Port Saint Joe | FL |
| USPZL | Port Saint Lucie | FL |
| USPJS | Port San Juan | AK |
| USPSL | Port San Luis | CA |
| USSUL | Port Sulphur | LA |
| USPOT | Port Tampa | FL |
| USTWD | Port Townsend | WA |
| USPVT | Port Trevorton | PA |
| USPWF | Port Wakefield | AK |
| USPWR | Port Walter | AK |
| USPTY | Port Washington | NJ |
| USPOW | Port Washington | NY |
| USPWA | Port Washington | WI |
| USPWN | Port Wentworth | GA |
| US2WM | Port William | OH |
| USPWI | Port Williams | AK |
| USPOJ | Portage | IN |
| USPTE | Portage | MI |
| USPM3 | Port Monmouth | NJ |
| USPM4 | Port Morris, Bronx | NY |
| USURR | Port Murray | NJ |
| USPON | Port Neches | TX |
| USPNJ | Port Newark | NJ |
| USOTI | Port Norris | NJ |
| USPRL | Port Oceanic | AK |
| USPBC | Port Of Palm Beach | FL |