- Creosote
- Crestwood Mobile Home Park
- Crosby
- Crystal Springs
- Connell
- Cabin Creek
- Cheviot
- Copalis Beach
- Cosmopolis
- Cottage Lake
- Coulee City
- Coulee Dam
- Country Homes
- Coupeville
- Carlson
- Ceres
- Cispus
- Claquato
- Cora
- Cowlitz
- Creston
- Canby
- Croskey
- Cusick
- Custer
- Carmill Station
- Cherokee
- Chillowist
- Chopaka
- Country Estates Mobile Home Park