| Code | Name | Region |
|---|---|---|
| USUIN | Quincy | IL |
| USMQI | Quincy | MA |
| USQUY | Quincy | MI |
| USP4G | Purling | NY |
| USPVR | Purvis | MS |
| USUUU | Puryear | TN |
| USPU2 | Put-in-bay | OH |
| USPUN | Putnam | CT |
| USPM5 | Putnam Heights | CT |
| USIUT | Putnamville | IN |
| USPUT | Putney | VT |
| US5PU | Pu'unene | HI |
| USPX7 | Puxico | MO |
| USPUY | Puyallup | WA |
| USYP9 | Pyote | TX |
| USQUV | Quail Valley | CA |
| USQAY | Quaker City | OH |
| USQKT | Quakertown | NJ |
| USUKT | Quakertown | PA |
| USQNT | Quanah | TX |
| USNYJ | Quantico | MD |
| USNYG | Quantico | VA |
| USQP2 | Quapaw | OK |
| USSCC | Prudhoe Bay | AK |
| USPZB | Prunedale | CA |
| USPYR | Pryor | OK |
| USKKX | Puckett | MS |
| USPUB | Pueblo | CO |
| USPR7 | Puerto Rico | TX |
| USPGQ | Puget Sound | WA |
| USPUA | Pulaski | NY |
| USPKL | Pulaski | TN |
| USUYB | Pulaski | VA |
| USPYK | Pulaski | WI |
| USPXU | Pulaski, Lawrence | PA |
| USPUW | Pullman | WA |
| USP5U | Pultneyville | NY |
| USPGD | Punta Gorda | FL |
| USPXW | Punxsutawney | PA |
| USPUZ | Purcell | OK |
| USPUI | Purcellville | VA |
| USYP5 | Purchase | NY |
| USPDU | Purdy | MO |
| USXKR | Prospect | OR |
| USRPC | Prospect | TN |
| USPP9 | Prospect | VA |
| USPPC | Prospect Creek | AK |
| USPHM | Prospect Harbor | ME |
| USPPG | Prospect Heights | IL |
| USPPK | Prospect Park | PA |