C
- (County Donegal) Cottian
- (County Donegal) Cloghbane
- (County Donegal) Croaghan Island
- (County Donegal) Carryblagh
- (County Donegal) Carran
- (County Donegal) Cloghfin
- (County Donegal) Carrodoan
- (County Donegal) Claragh
- (County Donegal) Clooney
- (County Donegal) Castlequarter
- (County Donegal) Carnaghan
- (County Donegal) Clonglash
- (County Donegal) Clonblesk
- (County Donegal) Cock Hill
- (County Donegal) Carha
- (County Donegal) Cloghglass
- (County Donegal) Cloontagh
- (County Donegal) Cloghfin
- (County Donegal) Claggan
- (County Donegal) Cloghorn
- (County Donegal) Craigawillin
- (County Donegal) Claragh
- (County Donegal) Cashel
- (County Donegal) Craigtown
- (County Donegal) Cracknagh
- (County Donegal) Culoort
- (County Donegal) Cashellackan
- (County Donegal) Cavangarden
- (County Donegal) Cashel
- (County Donegal) Connor Bridge