| Code | Name | Region |
|---|---|---|
| GBHW9 | Halwill | DEV |
| GBHVO | Ham Voe, Foula | ZET |
| GBHNS | Hamars Ness, Fetlar | ZET |
| GBHAM | Hamble | HAM |
| GBHMB | Hambleden | BKM |
| GBHBT | Hambleton | LAN |
| GBHML | Hambleton | NYK |
| GBHBR | Hambridge | SOM |
| GBHMT | Hamilton | SLK |
| GBHIB | Hamiltons Bawn | ARM |
| GBHMM | Hammersmith | HMF |
| GBHMV | Hamnavoe, Burra Isle | ZET |
| GBHPO | Hampole | DNC |
| GBHMS | Hampstead | CMD |
| GBHMP | Hampton | RIC |
| GBHBP | Hampton Bishop | HRT |
| GBYEL | Hailey | OXF |
| GBHAI | Hailsham | ESX |
| GBHNU | Hainault | RDB |
| GBHAB | Halbeath | FIF |
| GBHAE | Hale | HAL |
| GBHLE | Hale Bank | CHW |
| GBHSN | Halesowen | DUD |
| GBHSW | Halesworth | SFK |
| GBHLW | Halewood | KWL |
| GBHFX | Halifax | CLD |
| GBHKI | Halkirk | HLD |
| GBHZZ | Hallatrow | BST |
| GBHLV | Hallen | SGC |
| GBHFR | Halliford | SRY |
| GBHLG | Halling | KEN |
| GBHUH | Halloughton | NTT |
| GBHSA | Halsall | LAN |
| GBHTD | Halstead | ESS |
| GBHSD | Halstead | KEN |
| GBHLQ | Halton | LAN |
| GBGNQ | Gunthorpe | NFK |
| GBGRE | Gurney Slade | |
| GBGUT | Gutcher, Yell | ZET |
| GBGHN | Guyhirn | CAM |
| GBGWK | Gweek | CON |
| GBGND | Gwynedd | GWN |
| GBHKB | Hackbridge | STN |
| GBHKP | Hackenthorpe | SHF |
| GBHKO | Hackforth | NYK |
| GBHCK | Hackney | HCK |
| GBZBG | Haddenham | BKM |
| GBHDH | Haddenham | CAM |
| GBHAD | Haddington | ELN |
| GBFED | Hadfield | DBY |