C
- (County Monaghan) Coolmannan
- (County Monaghan) Corlealackagh
- (County Monaghan) Carrickaslane
- (County Monaghan) Creevelands
- (County Monaghan) Creeve
- (County Monaghan) Corfad
- (County Monaghan) Creevagh
- (County Monaghan) Corvoy
- (County Monaghan) Creeve
- (County Monaghan) Cremoyle
- (County Monaghan) Creeran
- (County Monaghan) Crossbane
- (County Monaghan) Corlougharoe
- (County Monaghan) Carraskea
- (County Monaghan) Clonkirk
- (County Monaghan) Creevelea
- (County Monaghan) Cavan
- (County Monaghan) Corlat
- (County Monaghan) Cloghernagh
- (County Monaghan) Clontoe
- (County Monaghan) Calliagh
- (County Monaghan) Coolcorragh
- (County Monaghan) Carsons Bridge
- (County Monaghan) Cortolym Bridge
- (County Monaghan) Castleshane
- (County Monaghan) Corraghbrack
- (County Monaghan) Carrigans
- (County Monaghan) Caldavnet
- (County Monaghan) Corryarbeg
- (County Monaghan) Carrickroe