K
- (Roscommon) Killavackan
- (Mayo County) Killasser
- (County Leitrim) Killarga
- (County Galway) Killagoola
- (Mayo County) Killadoon
- (County Galway) Kilkieran
- (Sligo) Kilglass
- (County Galway) Kilglass
- (Mayo County) Kilgarvan
- (Mayo County) Kilgarriff
- (Mayo County) Kilcummin
- (County Galway) Kilcolgan
- (County Galway) Kilchreest
- (Mayo County) Kilbride
- (County Galway) Kilbrickan
- (County Galway) Kilbennan
- (County Galway) Kilbeacanty
- (Mayo County) Kid Island
- (County Leitrim) Keshcarrigan
- (Sligo) Kesh
- (Roscommon) Kesh
- (County Galway) Kellys Grove
- (Mayo County) Keenagh
- (Mayo County) Keel
- (County Galway) Keekill
- (Mayo County) Kinnadoohy
- (County Galway) Knockduff
- (County Galway) Kilcaimin
- (Mayo County) Knockfadda
- (Sligo) Kilshalvy