- Lackagh
- Ladytown
- Laghy
- Lahardaun
- Lanesborough
- Larganreagh
- Lawcus
- Laytown
- Leap
- Legan
- Lehinch
- Leifear
- Leighlinbridge
- Leitrim
- Lemybrien
- Letterfrack
- Liscannor
- Liscarroll
- Lisdoonvarna
- Lisronagh
- Lissycasey
- Little Bray
- Littleton
- Lixnaw
- Longwood
- Lough Gowna
- Loughanure
- Loughfad Hill
- Loughglinn
- Loughlinstown
- Loughshinny
- Louisburgh
- Louth
- Lucan
- Lusk
- Lyre