- Coolnanoonagh
- Cools
- Coolvard Bridge
- Coom
- Coom
- Coomagearlahy
- Coomaspeara
- Coomatloukane
- Coombaha
- Coombane
- Coomnacarrig Bridge
- Coomnahincha
- Coon
- Coornagillagh
- Coosavuddig
- Corbally
- Corbally
- Corcas and Sandhills
- Cordal
- Coumaclavane
- Coumduff
- Cow Island
- Cowlane’s East
- Crean’s Cross Roads
- Creeveen
- Croanshagh Bridge
- Cromane
- Crompaun Bridge
- Crossderry
- Crossmount