- Caterpillar Island
- Cedarville
- Charter Oak
- Chelatchie
- Crawford
- Cresap Bay
- Creswell Heights
- Camano
- Covello
- Carbonado
- Carlsborg
- Carnation
- Cascade Valley
- Cashmere
- Cathan
- Cathcart
- Cathlamet
- Centerville
- Central Park
- Centralia
- Crown Point Vista
- Chehalis
- Chehalis Village
- Chelan
- Cheney
- Cherry Grove
- Chewelah
- Cactus
- Curry
- Chinook