| Code | Name | Region |
|---|---|---|
| GBLLW | Linlithgow | WLN |
| GBLSK | Linstock | CMA |
| GBLT2 | Linton | CAM |
| GBLTN | Linton | KEN |
| GBLNW | Linwood | LIN |
| GBLIO | Linwood | RFW |
| GBLPH | Liphook | HAM |
| GBLIS | Lisburn | LSB |
| GBLKD | Liskeard | CON |
| GBLSM | Lismore Island | |
| GBLRR | Lisnarrick | FMO |
| GBLIN | Lisnaskea | FER |
| GBISS | Liss | HAM |
| GBLST | Lissett | YOR |
| GBLTC | Litchfield | HAM |
| GBLRD | Litherland | SFT |
| GBLVY | Leven | ERY |
| GBLEV | Leven | FIF |
| GBLVN | Levenshulme | MAN |
| GBLVK | Levenwick | ZET |
| GBLVR | Leverburgh, Harris | ELS |
| GBLTX | Levington | SFK |
| GBLWE | Lewes | ESX |
| GBLWS | Lewisham | LEW |
| GBLEY | Leyburn | NYK |
| GBLYL | Leyland | LAN |
| GBLYO | Leyton | WFT |
| GBLHF | Lichfield | STS |
| GBLDD | Liddington | WIL |
| GBLD7 | Lidlington | CBF |
| GBLFT | Lifton | DEV |
| GBLIG | Lighthorne | WAR |
| GBLGE | Lightwater | SRY |
| GBLSF | Lilliesleaf | SCB |
| GBLIM | Limavady | LMV |
| GBLMK | Limekilns | FIF |
| GBLSE | Lees | OLD |
| GBLCS | Leicester | LEC |
| GBLEG | Leigh | KEN |
| GBLGH | Leigh | WGN |
| GBLOS | Leigh-on-sea | ESS |
| GBLBZ | Leighton Buzzard | CBF |
| GBIRE | Leire | LEC |
| GBLEN | Leiston | SFK |
| GBLEI | Leith | EDH |
| GBLEM | Lenham | KEN |
| GBZBX | Lenwade | NFK |
| GBLNZ | Lenzie | EDU |
| GBLEO | Leominster | HEF |
| GBLPT | Lepton | BRD |