| Code | Name | Region |
|---|---|---|
| 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 |
| USPS7 | Prospect, Butler | PA |
| USQPX | Prosper | TX |
| USXKP | Prosperity | SC |
| USPWS | Prosser | WA |
| USPT3 | Protection | KS |
| USPV5 | Providence | NC |
| USPVD | Providence | RI |
| USVEC | Providence | UT |
| USPFG | Providence Forge | VA |
| USVDC | Providence, Webster | KY |
| USPVC | Provincetown | MA |
| USPVU | Provo | UT |
| USPUF | Prudenville | MI |
| USPNZ | Princeville | IL |
| USPZI | Princeville | NC |
| USPRZ | Prineville | OR |
| USPRU | Prinsburg | MN |
| USPKE | Prior Lake | MN |
| USPJA | Proberta | CA |
| USPC7 | Proctor | MN |