| Code | Name | Region |
|---|---|---|
| USN7B | Prague | NE |
| USOUP | Prague | OK |
| USPR6 | Prairie | MS |
| USPII | Prairie City | IA |
| USIZY | Prairie City | OR |
| USPCD | Prairie Du Chien | WI |
| USPS3 | Prairie Du Sac | WI |
| USPEG | Prairie Grove | AR |
| USIHI | Prairie Hill, Limestone | TX |
| USXPH | Prairie Hill, Washington | TX |
| US2LL | Prairie View | IL |
| USPZW | Prairie View | TX |
| USVGP | Prairie Village | KS |
| USVPL | Potterville | MI |
| USPSR | Pottsboro | TX |
| USPTW | Pottstown | PA |
| USPSV | Pottsville | PA |
| USPOU | Poughkeepsie | NY |
| USOGH | Poughquag | NY |
| USUPU | Poulan | GA |
| USPUL | Poulsbo | WA |
| USYPU | Poultney | VT |
| USPN4 | Pound | VA |
| USPWJ | Pound | WI |
| USPG8 | Pound Ridge | NY |
| USPDM | Pounding Mill | VA |
| USQPW | Poway | CA |
| USPDS | Powder Springs | GA |
| USTXX | Powderly | TX |
| USPO5 | Powell | OH |
| USTNO | Powell | TN |
| USPRQ | Powell | WY |
| USPZO | Posen | IL |
| USPS2 | Posen | MI |
| USPYZ | Poseyville | IN |
| USPUK | Poskin | WI |
| USPZS | Post | TX |
| USPFI | Post Falls | ID |
| USPM7 | Post Mills | VT |
| USVVI | Postville | IA |
| USRKR | Poteau | OK |
| USPT8 | Poteet | TX |
| US5PT | Potlatch | ID |
| USPMK | Potomac | MD |
| USVPM | Potomac Falls | VA |
| USPSI | Potosi | MO |
| UST8P | Potrero | CA |
| USPPT | Potsdam | NY |
| USPT6 | Potter | WI |
| USPV2 | Potter Valley | CA |