Regions of Ireland
- Cranford
- Crana River
- Cranagh Castle
- Cranagher House
- Cragbrien House
- Cragan Castle
- Craddanstown
- Crab Island
- Craanford
- Coxtown
- The Cow
- Cousane
- Courtstown House
- Courtown House
- Courtown
- Courtmatrix
- Courtmacsherry Bay
- Courtmacsherry
- Coumshingaun Lough
- Coumeenoole Bay
- Coumduff
- Coulagh Bay
- Coulagh
- Costelloe Lodge
- Costelloe
- Corville House
- Cortown Castle
- Cortown
- Corryndoberleen
- Lough Corry
- Corroy
- Corrofin Lodge
- Corrofin
- Corofin
- Corrigo
- Corrig Mountain
- River Corrib
- Lough Corrib
- Corrawaleen
- Corraun Point
- Corraun
- Corraun
- Corra River
- Corran Lake
- Corradrishy
- Corrabut Gap
- Corock River
- Cornfield House
- Cornasaus
- Cornamona
- Cornaher
- Cornagrow Lough
- Cornageeha
- Cornafulla
- Cornacullew
- Corlough
- Corlea
- Cork Lough
- Corkip Lough
- Cork Harbour
- Corker River
- County Cork
- Cork
- Corglass
- Corgarve
- Corduff House
- Cordal
- Corcreeghagh
- Corcomroe Abbey
- Corcogemore
- Corbalton Hall
- Corbally Lough
- Corbally
- Corbally Cross Roads
- Corbally
- Coralstown
- Copse House
- Cúirt Choipinéar
- Copperalley
- Coppenagh House
- Cootehill
- Cootehall
- Coosavuddig
- Cooraclare
- Coopers Hill
- Cooperhill House
- Cooperhill House
- Coongar Harbour
- Coonanna Harbour
- Coonagh
- Coomnahincha
- Coomhola River
- Coomcallee
- Coomasaharn Lake
- Coomacarrea
- Coolvally
- Coolure
- Coolrus House
- Coolrain
- Coolnamuck Court
- Coolnahay
- Coolnagour House
- Coolmountain House
- Coolmore House
- Coolmore House
- Coolmore
- Coolmore
- Coolmelagh House
- Coolmela
- Coolmeen
- Coollick
- Coollegreane
- Coolkenna Street
- Coolishal House
- Coolin Lough
- Coolgreany
- Coolfinn House
- Cooley Point
- Coole West
- Coole Lough
- Coole House
- Cooleeny
- Coole East
- Coole Abbey
- Coolea
- Coole
- Coole
- Coolderry House
- Coolcullen
- Coolcour House
- Coolcashin House
- Coolboy
- Coolbawn House
- Coolbaun
- Coolavin
- Coolattin
- Coolatogher
- Coolaney
- Coolamoney
- Coolagh
- Coolagary
- Coolagarry Lough
- Coolacurn
- Coola Cross Roads
- Cooanmore Point
- Cooanmore Bay
- Convoy House
- Convoy
- Convamore
- Conors Island
- Connonagh
- Connolly
- Conniberry Junction
- Connemara
- Connacht
- Conna
- Lough Conn
- Conlawn Hill
- Coningbeg Rock
- Congor House
- Cong
- Coney Island
- Coney Island
- The Cones
- Commons
- Comeragh Mountains
- Colmanstown
- Colly
- Collorus
- Collooney
- Collon
- Collinstown
- Colbinstown
- Colligan River
- Collierstown
- Collegeland
- Colgagh
- Coleraine House
- Cods Head
- Codling Bank
- Cobh Road
- Cobh
- Cobduff
- Owengarve River
- Coars
- Coan
- Coalbrook House
- Coalbrook
- Coachford
- Clynagh Island
- Clynacartan
- Clyda River
- Clydagh River
- Clydagh River
- Clydagh River
- Clydagh House
- Clydagh
- Cloyne
- Cloverhill House
- Cloverhill