All cities and villages in Ireland
- Knockhill and Drinagh
- Knocklong
- Knockmahon
- Knockmore
- Knockmoylan
- Knocknagashel
- Knocknagree
- Knocknahilan
- Knockraha
- Knockroe
- Knocktopher
- Knockvicar
- Knockwilliam
- Knockyhena
- Knuttery
- Kylebrack
- Kylemore
- Kylesa
- Laban
- Labasheeda
- Labbadish
- Lackagh
- Lackan
- Ladysbridge
- Laffansbridge
- Laghtgeorge
- Laghy
- Lahard
- Lanesborough
- Laputa
- Laracor
- Laragh
- Larah
- Strandhill
- Larch Hill
- Largan
- Largy
- Largydonnell
- Larkfield
- Lattin
- Latton
- Lauragh
- Laurencetown
- Lavey
- Laytown
- Leanamore
- Leansaghane
- Leap
- The Leap
- Leatbeg
- Lecarrow
- Lecarrow
- Leckemy
- Leenaun
- Legan
- Leggah
- Lahinch
- Leighlinbridge
- Leitrim
- Leitrim
- Leixlip
- Lenstown
- Lerrig
- Lettera
- Letterdunane
- Letterfinish
- Letterfrack
- Letterkenny
- Leugh
- Licketstown
- Lickowen
- Lifford
- Limerick
- Limerick
- Limerick Junction
- Linsfort
- Lisacul
- Lisbealadea
- Lisboduff
- Liscananaun
- Liscannor
- Liscarney
- Liscarroll
- Liscasey
- Lisconly
- Lisdargan
- Lisdeen
- Lisdoonvarna
- Lisdowney
- Lisduff
- Lisduff
- Lisgoold
- Lisgrea
- Lisheen
- Lisheen
- Lisheen
- Lisheenavalla
- Lislary
- Lislevane
- Lismore
- Lismoyny
- Lisnageer
- Lisnakealwee
- Lispatrick
- Lispole
- Lisroe
- Lisronagh
- Lisryan
- Lissaniska
- Lissaphooca Cross Roads
- Lissataggle
- Lisselton
- Auburn
- Listellan
- Listellick
- Listerlin
- Listowel
- Listrolin
- Listry Bridge
- The Little Furze
- Littleton
- Lixnaw
- Lobinstown
- Loghill
- Lombardstown
- Longford
- Longford
- Longueville
- Longwood
- Looscaun
- Lorrha
- Loskeran
- Losset
- Loughanavally
- Loughane
- Lougher
- Loughglinn
- Loughlinstown
- Loughmoe
- Loughrea
- Louisburgh
- Louth
- Lowertown
- Lucan
- Luggacurren
- Lugglass Lower
- Lugglass Upper
- Lughinny
- Lugnadeffa
- Lukeswell
- Lurganboy
- Lurgangreen
- Lusk
- Lynnbury
- Lyracrumpane
- Lyrattin
- Lyre
- Lyre
- Lyre
- Maam Cross
- Maas
- Maas Lower
- Maas Upper
- Mackans
- Macreddin
- Macroom
- Maddockstown
- Maganey
- Maghera
- Maghery
- Mahonburgh Bridge
- Mahoonagh
- Malahide
- Malin
- Malin Beg
- Malin More
- Mallaranny
- Mallow
- Manning
- Manorcunningham
- Manorhamilton
- Manseltown
- Mansfieldstown
- Manulla
- Marble Hill
- Mary Fort
- Maryland
- Mary Ville
- Massytown
- Mastergeehy
- Maugha
- Maulyneill
- Maum
- Maum East
- Maum West
- Mauricemills
- Mayglass
- Maynooth
- Mayo
- Meanus
- Meelick
- Meelick
- Meelin
- Meenadeeny
- Meenasrona
- Meenlaragh
- Melkagh
- Menlough
- Midfield
- Midleton
- Milemill
- Milestone
- Milford
- Millbrook
- Millford
- Millroad
- Millstreet
- Millstreet
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown Malbay
- Milltownpass
- Minane Bridge
- Mitchells Town
- Mitchelstown
- Mitchelstown
- Moate
- Mocklershill
- Modelligo
- Modreeny
- Mogeely
- Mohill
- Molahiffe
- Monaghan
- Monamolin
- Monanveel
- Monart
- Monaseed
- Monaster
- Monasteraden
- Monasterevin
- Monasteroris