| Code | Name | Region |
|---|---|---|
| GBZBO | Kencot | OXF |
| GBKND | Kendal | CMA |
| GBKLW | Kenilworth | WAR |
| GBKL2 | Kenley | CRY |
| GBKCG | Kennacraig | AGB |
| GBKNN | Kenninghall | NFK |
| GBKIG | Kennington/london | LND |
| GBKHI | Kenny Hill | SFK |
| GBKEN | Kensington/london | KEC |
| GBKWT | Kensworth | CBF |
| GBKNM | Kent | KEN |
| GBZBP | Kentford | SFK |
| GBKSB | Kentisbeare | DEV |
| GBKWN | Kentish Town | LND |
| GBKTW | Kentish Town West | LBH |
| GBKRE | Kentmere | CMA |
| GBKAL | Kallin (ceallan), Isle Of Grimsay | ELS |
| GBKAR | Karcaldy | |
| GBKEA | Keadby | NLN |
| GBKDY | Keady | ARM |
| GBKSY | Kearsley | BOL |
| GBKEG | Kegworth | DBY |
| GBKWO | Kegworth | LEC |
| GBKEI | Keighley | BRD |
| GBKES | Keiss | HLD |
| GBKTH | Keith | MRY |
| GBKBR | Kelbrook | LAN |
| GBKGE | Kellingley | NYK |
| GBKLG | Kellington | NYK |
| GBKEL | Kells | ANT |
| GBKYB | Kelly Bray | CON |
| GBKLO | Kelso | SCB |
| GBKVD | Kelvedon | ESS |
| GBKMB | Kemberton | SHR |
| GBKEM | Kemble | GLS |
| GBKMP | Kempsford | GLS |
| GBISC | Isles Of Scilly | CON |
| GBISW | Isleworth | HNS |
| GBIST | Islington | ISL |
| GBILI | Islip | NTH |
| GBILP | Islip | OXF |
| GBITN | Itchen | HAM |
| GBITC | Itchenor | WSX |
| GBIVE | Iver | BKM |
| GBIVH | Iver Heath | BKM |
| GBIVY | Ivybridge | |
| GBIXW | Ixworth | SFK |
| GBJMS | Jamestown | WDU |
| GBJAR | Jarrow | STY |
| GBJBG | Jedburgh | SCB |