| Code | Name | Region |
|---|---|---|
| GBPBH | Pentrebach | MTY |
| GBPGW | Pentre-bach | POW |
| GBPYC | Pen-y-cae | POW |
| GBPEA | Penysarn | AGY |
| GBPEN | Penzance | CON |
| GBPRV | Perivale | EAL |
| GBPNP | Perranporth | CON |
| GBPBR | Perry Barr | BIR |
| GBPSH | Pershore | WOR |
| GBPER | Perth | PKN |
| GBPET | Peterborough | CAM |
| GBZCP | Peterculter | ABD |
| GBPHD | Peterhead | ABD |
| GBPTE | Peterlee | DUR |
| GBXPE | Peters Green | HRT |
| GBPTF | Petersfield | HAM |
| GBPCG | Pencarreg | CMN |
| GBPDD | Pen-clawdd | SWA |
| GBPND | Pencoed | BGE |
| GBPNE | Pendeen | |
| GBPEY | Penderyn | RCT |
| GB5PE | Pendlebury | SLF |
| GBPDT | Pendleton | LAN |
| GBPCU | Penicuik | MLN |
| GBPNS | Penistone | BNS |
| GBPKD | Penkridge | STS |
| GBPLA | Penllergaer | SWA |
| GBPMM | Penmaenmawr | GWN |
| GBPNN | Penn | BKM |
| GBPEL | Pennal | |
| GBENN | Pennan | ABD |
| GBPAN | Pennant | POW |
| GBPEO | Pennygown | AGB |
| GBPNR | Penrith | CMA |
| GBPRY | Penryn | CON |
| GBPSR | Pensarn | CMN |
| GBPPY | Paulerspury | NTH |
| GBDFO | Pavenham | BDF |
| GBPHV | Peacehaven | ESX |
| GBPPC | Peapack | SOM |
| GBPEP | Pease Pottage | WSX |
| GBPMH | Peasmarsh | ESX |
| GBPMS | Peasmarsh | SRY |
| GBPCK | Peckham | SWK |
| GBPLT | Peckleton | |
| GBPEE | Peebles | SCB |
| GBPDO | Peldon | ESS |
| GBPMY | Pembrey | PEM |
| GBPBD | Pembridge | HEF |
| GBPEM | Pembroke | PEM |