| Code | Name | Region |
|---|---|---|
| GBIKS | Ilkeston | DBY |
| GBILK | Ilkley | BRD |
| GBILH | Illston On The Hill | LEC |
| GBIMR | Ilminster | SOM |
| GBILN | Ilton | NYK |
| GBILO | Ilton | SOM |
| GBIMM | Immingham | NEL |
| GBIMP | Impington | CAM |
| GBINC | Ince | CHW |
| GBIMK | Ince-in-makerfield | WGN |
| GBINH | Inchinnan | RFW |
| GBICH | Inchture | PKN |
| GBIGT | Ingatestone | ESS |
| GBING | Ingham | LIN |
| GBIHM | Ingham | SFK |
| GBINL | Ingleton | NYK |
| GBUUR | Hurn | DOR |
| GBHUS | Hursley | HAM |
| GBHRU | Hurst | OLD |
| GBHUR | Hurst | WOK |
| GBHGN | Hurst Green | ESX |
| GBHBN | Hurstburne Tarrant | HAM |
| GBHER | Hurstpierpoint | WSX |
| GBHBC | Husborne Crawley | BDF |
| GBHHW | Huthwaite | NTT |
| GBHUX | Hutton | ESS |
| GBHTQ | Hutton | LAN |
| GBWWW | Hutton Cranswick | ERY |
| GBHYN | Huyton | KWL |
| GBHYD | Hyde | TAM |
| GBHYT | Hythe | HAM |
| GBHTH | Hythe | KEN |
| GBTCK | Ibstock | LEC |
| GBIBH | Ickburgh | NFK |
| GBICK | Icklesham | ESX |
| GBIDL | Idle | BRD |
| GBHUL | Hull | ERY |
| GBHVN | Hullavington | WIL |
| GBHMR | Humber | |
| GBHUY | Humberside Apt | ERY |
| GBHBS | Humberston | NEL |
| GBHRE | Humbie | ELN |
| GBHUF | Hungerford | WBK |
| GBHD3 | Hunsdon | HRT |
| GBHLU | Hunslet/leeds | LDS |
| GBHNT | Hunstanton | NFK |
| GBHST | Hunterston | NAY |
| GBHUD | Huntingdon | CAM |
| GBYON | Huntington | YOR |
| GBHT8 | Huntley | GLS |