All cities and villages in Ireland
- Clooncah
- Clooncan
- Clooncogaile
- Clooncoorha
- Cloondara
- Cloondergan
- Cloone
- Clooneen
- Clooneen
- Cloonfad
- Cloonfower
- Cloongowla
- Cloonkeen
- Cloonlara
- Cloonlavis
- Cloonmore
- Cloonmore Cross Roads
- Cloonslaun
- Cloonteen
- Cloontuskert
- Cloonusker
- Cloverhill
- Cloyne
- Clydagh
- Clynacartan
- Coachford
- Coalbrook
- Coan
- Coars
- Cobh
- Colgagh
- Collegeland
- Collierstown
- Colbinstown
- Collinstown
- Collon
- Collooney
- Collorus
- Colmanstown
- Commons
- Cong
- Conna
- Connolly
- Connonagh
- Convoy
- Coola Cross Roads
- Coolacurn
- Coolagarybeg
- Coolagh
- Coolamoney
- Coolaney
- Coolatogher
- Coolattin
- Coolbaun
- Coolboy
- Coolcullen
- Coole
- Coolea
- Coole East
- Cooleeny
- Coole West
- Coolgreany
- Coolkenna Street
- Coollegreane
- Coollick
- Coolmeen
- Coolmela
- Coolmore
- Coolrain
- Coolvally
- Coomnahincha
- Coonagh
- Cooraclare
- Coosavuddig
- Cootehall
- Cootehill
- Copperalley
- Coralstown
- Corbally
- Corbally Cross Roads
- Corbally
- Corcreeghagh
- Cordal
- Corgarve
- Corglass
- Cork
- Corlea
- Corlough
- Cornacullew
- Cornafulla
- Cornageeha
- Cornamona
- Corradrishy
- Corraun
- Corraun
- Corrawaleen
- Corrigo
- Corofin
- Corrofin
- Corroy
- Cortown
- Costelloe
- Coulagh
- Coumduff
- Courtmacsherry
- Courtmatrix
- Courtown
- Cousane
- Craanford
- Craddanstown
- Cranford
- Crannagh
- Cranroe
- Cratloe
- Craughwell
- Creagh
- Creagh
- Creaghanroe
- Creerin
- Creduff
- Creegh
- Creeharmore
- Creeslough
- Creevagh
- Creevagh
- Creeves
- Creevy
- Cregg
- Cregg
- Cregg
- Cregganbaun
- Creggaun
- Creggs
- Crinkill
- Crissard
- Croagh
- Croaghan
- The Crockan
- Crockaun
- Crockets Town
- Crockfadda
- Croghan
- Croghan
- Croghan
- Crolly
- Crookedwood
- Crookhaven
- Crookstown
- Croom
- Cross
- Cross
- Cross
- Crossabeg
- Crossakeel
- Cross Barry
- Crossboyne
- Crossdoney
- Crossea
- Crosserlough
- Cross Guns
- The Cross Guns
- Crosshaven
- Crosskeys
- Cross Keys
- Cross Keys
- Crossmolina
- Crossmount
- Crossna
- Crosspatrick
- Crosspatrick
- Falcarragh
- Crosswell
- Crowbane
- Crumlin
- Crumpaun
- Crusheen
- Crutt
- Grange
- Cuilmore
- Cuilmullagh
- Culdaff
- Cullahill
- Cullahill
- Culleens
- Cullen
- Cullen
- Cullenagh
- Cullentra
- Culmullin Cross Roads
- Culray
- Cur
- Curragh
- Curragh
- Curragha
- Curraghaleen
- Curraghgorm
- Curragh West
- Curraglass
- Curraheen
- Curranes
- Curreeny
- Curry
- Curryglass
- Cushina
- Dalgin
- Dalkey
- Dangan
- Dardistown
- Dawros Beg
- Dawros Bridge
- Dawros
- Deelis
- Delgany
- Delvin
- Dernagree
- Dernahelty Beg
- Dernahelty More
- Derreen
- Derreen
- Derreen
- Derreenavoggy
- Derrew
- Derrinkee
- Derrinturn
- Derrinvoney
- Derry
- Derryad
- Derrybeg
- Derrybrien
- Derryclure
- Derrycoffey
- Derryfrench
- Derrylehan
- Derrymore
- Derrymullan
- Derrynacaheragh
- Derryrush
- Diamond
- Dingle
- Doagh
- Doagh Beg
- Dollymount
- Dollys Grove
- Donabate
- Donacarney
- Donadea
- Donaghmore
- Donaghmore
- Donaghmore Bridge
- Donaghmoyne