| Code | Name | Region |
|---|---|---|
| GBWEM | Welham Green | HRT |
| GBELD | Welland | WOR |
| GBWSU | Wellesbourne | WAR |
| GBWEG | Welling | BEX |
| GBWEL | Wellingborough | NTH |
| GBWQL | Wellington | HEF |
| GBWNT | Wellington | SOM |
| GBWNG | Wellington | TFW |
| GBWLS | Wells | SOM |
| GBWNS | Wells-next-the-sea | NFK |
| GBWPS | Welshpool | POW |
| GBWQT | Welton | CMA |
| GBWLQ | Welton | ERY |
| GBWLN | Welwyn | HRT |
| GBWGC | Welwyn Garden City | HRT |
| GBWNR | Wem | SHR |
| GBWAV | Watford Village | |
| GBWUD | Wath Upon Dearne | ROT |
| GBWAA | Watlington | NFK |
| GBWXF | Watlington | OXF |
| GBWTT | Watton | NFK |
| GBWWN | Wattstown | RCT |
| GBWWD | Waunarlwydd | SWA |
| GBWT4 | Waverton | CMA |
| GBWZD | Weald | KEN |
| GBWEA | Wealdstone | BEN |
| GBWHD | Wear Head | DUR |
| GBWAE | Weare | SOM |
| GBWEV | Weaverthorpe | NYK |
| GBWEO | Wedmore | SOM |
| GBWED | Wednesbury | SAW |
| GBWEF | Wednesfield | WLV |
| GBWEE | Weedon | BKM |
| GB87N | Weedon Beck | NTH |
| GBWEZ | Weeton | LAN |
| GBEIR | Weir | LAN |
| GBWRA | Warnham | WSX |
| GBWPT | Warrenpoint | DOW |
| GBWRN | Warrington | WRT |
| GBWSS | Warsash | HAM |
| GBWRT | Warton | LAN |
| GBWRL | Warton | WAR |
| GBWAW | Warwick | CMA |
| GBWWK | Warwick | WAR |
| GBWNN | Washington | SND |
| GBWHG | Washington | WSX |
| GBWAT | Watchet | SOM |
| GBWAI | Watchfield | OXF |
| GBWTO | Water Orton | WAR |
| GBWBE | Waterbeach | CAM |