| Code | Name | Region |
|---|---|---|
| USPFK | Prince Frederick | MD |
| USJPG | Prince George | VA |
| USPA8 | Princess Anne | MD |
| USPRA | Prairieville | LA |
| USPTT | Pratt | KS |
| USPUG | Prattsburg | NY |
| USPV3 | Prattsville | AR |
| US9PV | Prattsville | NY |
| USPRV | Prattville | AL |
| USXPL | Preble | IN |
| USPR9 | Preble | NY |
| USZWZ | Premont | TX |
| USPRW | Prentice | WI |
| USPS8 | Prescott | AR |
| USPRC | Prescott | AZ |
| USRSC | Prescott | OR |
| USPQW | Prescott | WA |
| USPC5 | Prescott | WI |
| USPV4 | Prescott Valley | AZ |
| USPUO | Presho | SD |
| USPRE | Presidio | TX |
| USPQI | Presque Isle | ME |
| USPSS | Presque Isle | MI |
| USPP4 | Powells Point | NC |
| USXKY | Powers Lake | WI |
| USZPW | Powhatan | VA |
| US8PW | Pownal | ME |
| USYPW | Pownal | VT |
| USVPJ | Poy Sippi | WI |
| USPOV | Poynette | WI |
| 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 |