C
- (Mayo County) Carrowbeg
- (Mayo County) Carrowmoremoy
- (Mayo County) Cloonlumney
- (Mayo County) Clooncleevragh
- (Mayo County) Cloonacannana
- (Mayo County) Cartronmacmanus
- (Mayo County) Carrowna geeragh
- (Mayo County) Cullentragh
- (Mayo County) Caldragh
- (Mayo County) Cloonturnaun
- (Mayo County) Cloonygowan
- (Mayo County) Creggaballagh
- (Mayo County) Carrowneden
- (Mayo County) Cuildoo
- (Mayo County) Carn
- (Mayo County) Coolcashla
- (Mayo County) Collagh
- (Mayo County) Carrownacross
- (Mayo County) Clooneen
- (Mayo County) Clooninshin
- (Mayo County) Carrowkeel
- (Mayo County) Carrowmore
- (Mayo County) Cuiltrasna
- (Mayo County) Carrick
- (Mayo County) Corrahoor
- (Mayo County) Cordarragh
- (Mayo County) Cloonkedagh
- (Mayo County) Cloomdoolough
- (Mayo County) Cartron
- (Mayo County) Cloonmore Lower