- Daingean
- Danescastle
- Darndale
- Delvin
- Derrinturn
- Derry
- Derrybeg
- Dollymount
- Donaghmede
- Donard
- Donaskeagh
- Donegal
- Doneraile
- Donnybrook
- Donnycarney
- Donore
- Dooagh
- Doon
- Doonbeg
- Dowra
- Drangan
- Drimoleague
- Droichead Nua
- Dromahair
- Dromcollogher
- Dromina
- Dromiskin
- Drommahane
- Dromod
- Dromore West
- Drumconrath
- Drumkeen
- Drumkeeran
- Drumlish
- Drumshanbo
- Drumsna
- Duagh
- Duleek
- Duncannon
- Dunderrow
- Dunderry
- Dundrum
- Dundrum
- Dunfanaghy
- Dungloe
- Dunhill
- Duniry
- Dunkineely
- Dunlavin
- Dunleer
- Dunmore
- Dunmore East
- Dunshaughlin
- Durrow
- Durrus