C
- (An Cabhán) Cornafean
- (An Cabhán) Corraweelis
- (An Cabhán) Cargagh
- (An Cabhán) Cross Forts
- (An Cabhán) Cullentragh
- (County Monaghan) Clonoula
- (An Cabhán) Claragh
- (An Cabhán) Cordingin
- (An Cabhán) Corgreagh
- (An Cabhán) Coppanagh Mills
- (County Monaghan) Corragarry Cross Roads
- (An Cabhán) Corick Bridge
- (An Cabhán) Carrickallen
- (An Cabhán) Carricknashoke
- (An Cabhán) Clifferna
- (An Cabhán) Corraneary
- (An Cabhán) Cullies Cross Roads
- (County Monaghan) Corgreagh
- (An Cabhán) Cargaghoge
- (An Cabhán) Corravilla
- (An Cabhán) Crossmakeelan
- (County Monaghan) Carrickmaclim
- (County Monaghan) Corvally
- (County Monaghan) Cargaghlisnanarney
- (County Monaghan) Cashlan
- (County Monaghan) Culloville
- (County Monaghan) Carrickartagh
- (County Monaghan) Cortober
- (County Monaghan) Cortaghart
- (County Monaghan) Concra