| Code | Name | Region |
|---|---|---|
| GBHTW | Hartwell | NTH |
| GBHRW | Harwich | ESS |
| GBHWR | Harworth | NTT |
| GBHSY | Haseley | WAR |
| GBHSR | Haselor | WAR |
| GBHKS | Haskayne | LAN |
| GBHAR | Hardley | HAM |
| GBHDC | Hardwick | CAM |
| GBHRK | Hardwicke | GLS |
| GBHRF | Harefield | HIL |
| GBGL7 | Haresfield | GLS |
| GBAWD | Harewood | YOR |
| GBRGY | Haringey | LND |
| GBHAK | Harle Syke | LAN |
| GBHAC | Harlech | GWN |
| GBHRD | Harlesden | BEN |
| GBHAS | Harleston | NFK |
| GBHGT | Harlington | HIL |
| GBHRL | Harlow | ESS |
| GBHMW | Harmondsworth | HIL |
| GBHHI | Harold Hill | HAV |
| GBHLD | Harold Wood | HAV |
| GBHPD | Harpenden | HRT |
| GBHAA | Harraby | CMA |
| GBXHR | Harrietsham | KEN |
| GBHRR | Harrington | CMA |
| GBHPL | Hampton Hill | RIC |
| GBLVT | Hampton Lovett | WOR |
| GBHPV | Hampton Lucy | WAR |
| GBESI | Hampton Wick | RIC |
| GBHMO | Hamworthy | DOR |
| GBHFO | Handforth | CHE |
| GBHBW | Handsworth | BIR |
| GBHND | Handsworth | SHF |
| GBHNL | Hanley | STS |
| GBHYA | Hanley Swan | WOR |
| GBINN | Hannington | NTH |
| GBHNW | Hanwell | EAL |
| GBAEW | Hanwell | LND |
| GBZBH | Hanwell | OXF |
| GBHAO | Hanworth | HNS |
| GBHWX | Hanworth | LND |
| GBHAP | Hapton | LAN |
| GBHY2 | Harbury | |
| GBHXY | Harby | NTT |
| GBHHM | Hardham | WSX |
| GBHAG | Halton Gill | NYK |
| GBHDW | Halton West | NYK |
| GBHWS | Haltwhistle | NBL |
| GBHEL | Halwell | DEV |