| Code | Name | Region |
|---|---|---|
| GBPED | Pembroke Dock | PEM |
| GBPMB | Pembury | KEN |
| GBPNH | Penarth | VGL |
| GBPNB | Penberth | CON |
| GBPCD | Pencader | CMN |
| GBPCI | Pencaitland | ELN |
| GBPGR | Pamber Green | HAM |
| GBPAB | Pangbourne | WBK |
| GBPSV | Papa Stour | |
| GBPPW | Papa Westray | ORK |
| GBPEV | Papworth Everard | CAM |
| GBPAR | Par | CON |
| GBPBL | Parbold | LAN |
| GBPHM | Parham | SFK |
| GBPKG | Park Gate | HAM |
| GBPYA | Park Royal | LND |
| GBXPA | Parkend | CMA |
| GBPST | Parkeston Quay | ESS |
| GBPTT | Partington | TRF |
| GBZCO | Partney | LIN |
| GBPRG | Partridge Green | WSX |
| GBPWY | Patchway | SGC |
| GBPHH | Pathhead | MLN |
| GBPNA | Patna | EAY |
| GBPRF | Patricroft | MAN |
| GBPGM | Pattingham | STS |
| GBXOX | Oxenhope | BRD |
| GBOXF | Oxford | OXF |
| GBOXI | Oxhill | WAR |
| GBOXT | Oxshott | SRY |
| GBOXD | Oxted | SRY |
| GBOXO | Oxton | NTT |
| GBPKT | Packington | LEC |
| GBPAT | Paddington | KEC |
| GBPDW | Paddock Wood | KEN |
| GBPDH | Padiham | LAN |
| GBPAD | Padstow | CON |
| GBPWT | Padworth | WBK |
| GBPGA | Pagham | WSX |
| GBPAG | Paglesham | ESS |
| GBPGN | Paignton | |
| GBPAS | Paisley | RFW |
| GBPAY | Paisley | RFW |
| GBPLG | Palmers Green | ENF |
| GBPAL | Palnackie | DGY |
| GBPAO | Palterton | DBY |
| GBOSN | Ossington | NTT |
| GBOLP | Osterley Park | HNS |
| GBOWW | Oswaldtwistle | LAN |
| GBOWR | Oswestry | SHR |