- Castell
- Castle Hill Estate
- Castle Hills
- Castlewoods
- Castolon
- Castor
- Castroville
- Cat Spring
- Catalina Village
- Catarina
- Catherine Colonia
- Cattle Island
- Cattleman's North Ranchos Colonia
- Cattleman's North Ranchos Number 2 Colonia
- Cattleman's North Ranchos Number 3 Colonia
- Causey Place
- Cavazos
- Caves Spring
- Caviness
- Cavitt
- Cawthon
- Cayote
- Cayuga
- Cedar Bayou
- Cedar Creek
- Cedar Creek
- Cedar Grove
- Cedar Grove
- Cedar Hill
- Cedar Hill