| Code | Name | Region |
|---|---|---|
| USZTS | Parrottsville | TN |
| USP4A | Parshall | CO |
| USPPY | Parsippany | NJ |
| USPPF | Parsons | KS |
| USPSZ | Parsons | TN |
| USPWV | Parsons | WV |
| USPG9 | Parsonsburg | MD |
| US9PA | Parsonsfield | ME |
| USPSD | Pasadena | CA |
| USYPC | Pasadena | MD |
| USPAS | Pasadena | TX |
| USPKP | Parkesburg | PA |
| USP8D | Parkfield | CA |
| USP7K | Parkland | FL |
| USKM9 | Parkman | OH |
| USPRK | Parkridge | NJ |
| USPKZ | Parkrose | OR |
| USKPK | Parks | AK |
| USPK3 | Parks | AZ |
| USPKY | Parksley | VA |
| USAKS | Parkston | SD |
| US4RK | Parkton | MD |
| USPKT | Parkton | NC |
| USPK4 | Parkville | MD |
| USKLE | Parkville | MO |
| USPW2 | Parkwater-spokane | WA |
| USPGW | Parkwood | PA |
| USPAR | Parlier | CA |
| USPUJ | Parlin | NJ |
| USQPA | Parma | ID |
| USPAM | Parma | MI |
| USPKC | Park City | IL |
| USPC9 | Park City | KS |
| USPC6 | Park City | KY |
| USPAC | Park City | UT |
| USPKF | Park Falls | WI |
| USPFO | Park Forest | IL |
| USPH6 | Park Hill | OK |
| USPKH | Park Hills | MO |
| USPKJ | Park Junction | PA |
| USPKD | Park Rapids | MN |
| USPKG | Park Ridge | IL |
| US9PR | Park Ridge | NJ |
| USAAZ | Parker | AZ |
| USZKR | Parker | CO |
| USP6K | Parker | SD |
| USPK9 | Parker | VA |
| USPKW | Parker | WA |
| USPKR | Parker Ford | PA |
| USPA4 | Parkers Lake | KY |