- Clatskanie Heights
- Clear Creek
- Clear Lake
- Clearwater
- Clem
- Cleveland
- Clifton
- Climax
- Cloverdale
- Cloverdale
- Cluster
- Coaledo
- Cobb
- Cochran Islands
- Coffee Island
- Cold Springs
- Cold Springs Junction
- Cole Island
- Cole Island
- Coles Valley
- Colestin
- College Hill
- Colton
- Columbia Heights
- Comstock
- Concord
- Conical Rock
- Conical White Rock
- Cook
- Coon Island