C
- (Roscommon) Corrigeenroe
- (Roscommon) Clerragh
- (Roscommon) Corglass
- (Roscommon) Carrickadraan
- (Roscommon) Clooncoose
- (Roscommon) Cleaheen
- (Sligo) Cuppanagh
- (Sligo) Cloonloogh
- (Sligo) Clooneagh
- (Sligo) Cloonlaheen
- (Sligo) Culfadda
- (Sligo) Carrowcrory
- (Sligo) Castlebaldwin
- (Sligo) Carrownacreevy
- (Sligo) Cloonahinshin
- (Sligo) Carrigans
- (Sligo) Carrigans Lower
- (Sligo) Clooneen
- (Sligo) Cluid
- (Sligo) Cooney
- (Sligo) Carrownacarrick
- (Sligo) Carrowntawy
- (Sligo) Claragh Scotch
- (Sligo) Carrowreilly
- (Sligo) Cloonkeevy
- (Sligo) Carrowreagh
- (Sligo) Carrowreagh
- (Sligo) Cloonlaughil
- (Sligo) Cully Cross Roads
- (Sligo) Curraghbonaun