- Lixwm
- Llanfynydd
- Lloc
- Llanarmon-yn-Ial
- Llanfwrog
- Llidiart-y-Parc
- Llan Ffestiniog
- Llandanwg
- Llanfaglan
- Llanfihangel-y-Pennant
- Llangelynin
- Llangybi
- Llwyn-hudol
- Lambston
- Lampeter
- Lampeter Velfrey
- Lamphey
- Landimore
- Landore
- Landshipping
- Langstone
- Laugharne
- Lavernock
- Lawrenny
- Leckwith
- Leeswood
- Letterston
- Leweston
- Little Haven
- Little Mill