| Code | Name | Region |
|---|---|---|
| USPB6 | Phillipsburg | MO |
| USPHI | Phillipsburg | NJ |
| USZPG | Phillipsburg | NY |
| USPH8 | Phillipston | MA |
| USPH3 | Philmont | NY |
| USPL6 | Philo | CA |
| USPJI | Philo | OH |
| USYPH | Philomath | OR |
| USPPP | Philpot | KY |
| US8PP | Phippsburg | ME |
| USP6H | Phoenicia | NY |
| USPHX | Phoenix | AZ |
| USPXI | Petrolia | TX |
| USPV7 | Pettisville | OH |
| USEQY | Petty | TX |
| USPVB | Pevely | MO |
| USPZE | Pewamo | MI |
| USPEW | Pewaukee | WI |
| USEYC | Pewee Valley | KY |
| USYPT | Peyton | CO |
| USPFT | Pfafftown | NC |
| USPFV | Pflugerville | TX |
| USPFX | Pharr | TX |
| USVPH | Phelan | CA |
| USIPP | Phelps | KY |
| USPPX | Phelps | NY |
| USPHA | Phenix City | AL |
| USPCB | Phil Campbell | AL |
| USPXX | Philadelphia | MS |
| USPDP | Philadelphia | NY |
| USPHL | Philadelphia | PA |
| USPNE | Philadelphia North East Apt | PA |
| US2PB | Petersboro | UT |
| USPSG | Petersburg | AK |
| USPB8 | Petersburg | IN |
| USRUG | Petersburg | KY |
| USM94 | Petersburg | MI |
| USPBP | Petersburg | NE |
| USUPG | Petersburg | NJ |
| USTSB | Petersburg | NY |
| USPBU | Petersburg | PA |
| USTSR | Petersburg | TN |
| USPBB | Petersburg | TX |
| USPTB | Petersburg | VA |
| USPGC | Petersburg | WV |
| USPB2 | Petersburg, Menard | IL |
| USM7A | Petersham | MA |
| USPNF | Peterson's Point | AK |
| USPET | Petoskey | MI |
| USEUM | Petroleum | IN |