| Code | Name | Region |
|---|---|---|
| USZKV | Pollocksville | NC |
| USPOO | Polo | IL |
| USBSF | Pohakuloa | HI |
| USPFL | Poinciana | FL |
| UST9S | Point | TX |
| USPA2 | Point Arena | CA |
| USKPB | Point Baker | AK |
| USTBW | Point Barrow | AK |
| USPB9 | Point Breeze | PA |
| USPC8 | Point Clear | AL |
| USPCR | Point Comfort | TX |
| USPP5 | Point Conception | CA |
| USPHO | Point Hope | AK |
| USPJH | Point Judith | RI |
| USPIZ | Point Lay | AK |
| USUPX | Point Lookout | PA |
| USTMD | Point Marion | PA |
| USPWC | Point Mugu Nawc | CA |
| USPFS | Point Of Rocks | WY |
| USZHC | Point Pleasant | NJ |
| USP6P | Point Pleasant | NJ |
| USPPZ | Point Pleasant | WV |
| USGYU | Plymouth | VT |
| USP5Y | Plymouth | WA |
| USPMW | Plymouth | WI |
| USPMM | Plymouth Meeting | PA |
| USPL4 | Plympton | MA |
| USPOX | Poca | WV |
| USPXH | Pocahontas | AR |
| USPOH | Pocahontas | IA |
| USPH2 | Pocahontas | MS |
| USQPH | Pocahontas | TN |
| USPHH | Pocahontas | TN |
| USPJC | Pocasset | MA |
| USOAT | Pocatalico | WV |
| USPIH | Pocatello | ID |
| USPCL | Pocola | OK |
| USPKM | Pocomoke City | MD |
| USPOR | Pocono Manor | PA |
| US9PP | Pocono Pines | PA |
| USP9S | Pocono Summit | PA |
| USOTK | Poestenkill | NY |
| USPWD | Plentywood | MT |
| USQOV | Plover | IA |
| USPLW | Plover | WI |
| USPJU | Pluckemin | NJ |
| USPUR | Plumerville | AR |
| USPUV | Plumsteadville | PA |
| USPYT | Plymouth | CA |
| USYMU | Plymouth | CT |