| Code | Name | Region |
|---|---|---|
| GBLGF | Longfield | KEN |
| GBLOF | Longford | COV |
| GBLHP | Longhope | GLS |
| GBLHO | Longhope, Hoy | ORK |
| GBLOQ | Longley | SHF |
| GBVJL | Longmanhill | ABD |
| GBLRZ | Lochranza, Isle Of Arran | NAY |
| GBOCH | Lochs | ELS |
| GBLCH | Lochwinnoch | RFW |
| GBLKB | Lockerbie | DGY |
| GBLKG | Locking | NSM |
| GBLKH | Locks Heath | HAM |
| GBLDQ | Loddon | NFK |
| GBODE | Lode | CAM |
| GBLOZ | Lode | NFK |
| GBLON | London | LND |
| GBLCT | London City Airport | LND |
| GBLCL | London Colney | HRT |
| GBLGX | London Gateway Park | ESS |
| GBLGP | London Gateway Port | ESS |
| GBLTP | London Thamesport | KEN |
| GBLDY | Londonderry | DRY |
| GBLAS | Long Ashton | NSM |
| GBLNI | Long Bennington | LIN |
| GBLBU | Long Buckby | NTH |
| GBLOC | Long Crendon | BKM |
| GBLNH | Loanhead | MLN |
| GBLBE | Loch Buie (mull) | AGB |
| GBLCC | Loch Carnan | |
| GBLGY | Loch Gelly | FIF |
| GBLCG | Loch Long | AGB |
| GBLRP | Loch Ryan Pt | DGY |
| GBLSC | Loch Scridain (isle Mull) | AGB |
| GBLHS | Loch Striven | AGB |
| GBLCD | Loch Torridon | HLD |
| GBLCI | Lochailort | HLD |
| GBLOL | Lochaline | HLD |
| GBLOA | Lochans | DGY |
| GBLCA | Lochawe | AGB |
| GBLBD | Lochboisdale (loch Baghasdail), South Uist | ELS |
| GBLCR | Lochcarron | HLD |
| GBLNA | Lochearnhead | STG |
| GBLCY | Lochgelly | FIF |
| GBLOH | Lochgilphead | |
| GBLOV | Lochinver | HLD |
| GBLMA | Lochmaddy | ELS |
| GBLNR | Llanharan | RCT |
| GBLHI | Llanhilleth | |
| GBLLZ | Llanidloes | POW |
| GBLLO | Llanon | CGN |