- Laleston
- Lambston
- Lampeter
- Lampeter Velfrey
- Lamphey
- Landimore
- Landore
- Landshipping
- Langstone
- Laugharne
- Lavernock
- Lavister
- Lawrenny
- Leckwith
- Leeswood
- Leighton
- Letterston
- Leweston
- Lewistown
- Little Haven
- Little Mancot
- Little Mill
- Little Mountain
- Little Newcastle
- Lixwm
- Llanbedr-Dyffryn-Clwyd
- Llan
- Llan-fair
- Llan Ffestiniog
- Llan-non