| Code | Name | Region |
|---|---|---|
| GBLER | Lerwick | ZET |
| GBLSL | Leslie | ABD |
| GBLMW | Lesmahagow | SLK |
| GBLTH | Letchworth | HRT |
| GBLGU | Letham | ANS |
| GBLET | Letterston | PEM |
| GBLXT | Laxton | NTT |
| GBZBU | Leadenham | LIN |
| GBLDA | Leadon | |
| GBZBV | Leamington | WAR |
| GBLIH | Leamington Hastings | WAR |
| GBLSP | Leamington Spa | WAR |
| GBLEH | Leatherhead | SRY |
| GBLVG | Leavesden Green | HRT |
| GBLEC | Lechlade | GLS |
| GBLCK | Leckhampstead | WBK |
| GBLCW | Leckwith | VGL |
| GBLED | Ledbury | HEF |
| GBLE7 | Lee | BKM |
| GBEMR | Lee Moor | DEV |
| GBZBW | Leeds | KEN |
| GBLBA | Leeds | LDS |
| GBLEE | Leeds Icd | LDS |
| GBLEK | Leek | STS |
| GBMZB | Leeming Bar | NYK |
| GBLES | Lee-on-the-solent | HAM |
| GBLRB | Larbert | FAL |
| GBLGO | Largo | FIF |
| GBLGS | Largs | NAY |
| GBLRH | Lark Hill | WIL |
| GBLRK | Larkfield | IVC |
| GBLRL | Larkhall | SLK |
| GBLKL | Larkhill | WIL |
| GBLRI | Larling | NFK |
| GBLAR | Larne | LRN |
| GBQLA | Lasham | HAM |
| GBXLS | Lasswade | MLN |
| GBLAC | Latchingdon | ESS |
| GBLWL | Latheronwheel | HLD |
| GBZBT | Lauder | SCB |
| GBLUH | Laughton | ESX |
| GBLAU | Launceston | CON |
| GBLKK | Laurencekirk | ABD |
| GBLAV | Lavenham | SFK |
| GBLAW | Law | SLK |
| GBLAX | Laxo | ZET |
| GBLEB | Lane End | BKM |
| GBLGR | Langar | NTT |
| GBLB9 | Langbank | RFW |
| GBLDH | Langdon Hills | ESS |