- Lambston
- Lampeter
- Lampeter Velfrey
- Lamphey
- Landimore
- Landore
- Landshipping
- Langstone
- Laugharne
- Lavernock
- Lawrenny
- Leckwith
- Leeswood
- Letterston
- Leweston
- Little Haven
- Little Mill
- Little Newcastle
- Llanbedr-Dyffryn-Clwyd
- Llanaber
- Llanaelhaiarn
- Llanafan
- Llanafan-fawr
- Llanallgo
- Llananno
- Llanarmon
- Llanarmon Dyffryn-Ceiriog
- Llanarmon-Mynydd-mawr
- Llanarth
- Llanarthne