- Lakenheath, Suffolk
- Lambeth, Lambeth
- Lampeter, Ceredigion
- Lanark, South Lanarkshire
- Lancaster, Lancashire
- Lanchester, Co. Durham
- Langholm, Dumfries and Galloway
- Langley Moor, Co. Durham
- Larkhall, South Lanarkshire
- Larkhill, Wiltshire
- Larne, Co. Antrim
- Lasswade, Midlothian
- Launceston, Cornwall
- Laurencekirk, Aberdeenshire
- Leatherhead, Surrey
- Ledbury, Herefordshire
- Lee On Solent, Hampshire
- Leeds, West Yorkshire
- Leek, Staffordshire
- Leicester, Leicestershire
- Leigh, Greater Manchester
- Leigh On Sea, Essex
- Leighton Buzzard, Bedfordshire
- Leiston, Suffolk
- Leominster, Herefordshire
- Letchworth, Hertfordshire
- Leven, Fife
- Lewes, East Sussex
- Lewisham, Lewisham
- Leyland, Lancashire
- Leyton, Waltham Forest
- Leytonstone, Waltham Forest
- Lichfield, Staffordshire
- Lightwater, Surrey
- Limavady, Co. Londonderry
- Lincoln, Lincolnshire
- Linlithgow, West Lothian
- Linthwaite, West Yorkshire
- Linton, Cambridgeshire
- Linwood, Renfrewshire
- Liphook, Hampshire
- Lisburn, Co. Antrim
- Liskeard, Cornwall
- Lisnaskea, Co. Fermanagh
- Little Chalfont, Buckinghamshire
- Littleborough, Greater Manchester
- Littlehampton, West Sussex
- Liversedge, West Yorkshire
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- Livingston, West Lothian
- Llandeilo, Carmarthenshire
- Llandovery, Carmarthenshire
- Llandrindod Wells, Powys
- Llandudno, Conwy
- Llanelli, Carmarthenshire
- Llanfairfechan, Conwy
- Llangadog, Carmarthenshire
- Llangefni, Isle Of Anglesey
- Llangollen, Denbighshire
- Llanidloes, Powys
- Llanrwst, Conwy
- Llantrisant, Rhondda Cynon Taff
- Llantwit Major, Vale Of Glamorgan
- Llay, Wrexham
- Loanhead, Midlothian
- Lochgelly, Fife
- Lochwinnoch, Renfrewshire
- Lockerbie, Dumfries and Galloway
- Locks Heath, Hampshire
- Locksbottom, Bromley
- Loftus, Co. Cleveland
- Londonderry, Co. Londonderry
- Long Crendon, Buckinghamshire
- Long Eaton, Derbyshire
- Long Stratton, Norfolk
- Long Sutton, Lincolnshire
- Longbenton, Tyne and Wear
- Longniddry, East Lothian
- Longridge, Lancashire
- Longtown, Cumbria
- Looe, Cornwall
- Lossiemouth, Moray
- Lostwithiel, Cornwall
- Loughborough, Leicestershire
- Loughton, Essex
- Louth, Lincolnshire
- Lowestoft, Suffolk
- Ludlow, Shropshire
- Lurgan, Co. Armagh
- Luton, Luton
- Lutterworth, Leicestershire
- Lydney, Goucestershire
- Lyme Regis, Dorset
- Lymington, Hampshire
- Lyndhurst, Hampshire
- Lytham St Annes, Lancashire
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