| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Clallam Bay | city | Washington | United States | 48.25 | -124.26 | 59 | |
| Claquato | city | Washington | United States | 46.64 | -123.02 | 196 | |
| Clarkston | city | Washington | United States | 46.42 | -117.05 | 830 | |
| Clarkston Heights | city | Washington | United States | 46.40 | -117.08 | 1102 | |
| Clasen Cove Estates Mobile Home Park | city | Washington | United States | 48.09 | -123.11 | 144 | |
| Classet | city | Washington | United States | 48.39 | -124.68 | 830 | |
| Clay City | city | Washington | United States | 46.93 | -122.26 | 830 | |
| Clayton | city | Washington | United States | 48.00 | -117.56 | 2509 | |
| Clayton Meadows Mobile Home Park | city | Washington | United States | 47.99 | -117.56 | 2509 | |
| Cle Elum | city | Washington | United States | 47.20 | -120.94 | 1899 | |
| Clear Creek Mobile Home Park | city | Washington | United States | 47.69 | -122.69 | 190 | |
| Clear Lake | city | Washington | United States | 48.46 | -122.23 | 193 | |
| Clearbrook | city | Washington | United States | 48.98 | -122.32 | 59 | |
| Clearview | city | Washington | United States | 47.83 | -122.13 | 830 | |
| Clearview Estates Mobile Home Park | city | Washington | United States | 47.84 | -122.12 | 830 | |
| Clearwater | city | Washington | United States | 47.58 | -124.29 | 98 | |
| Cleveland | city | Washington | United States | 45.97 | -120.35 | 3349 | |
| Cliffdell | city | Washington | United States | 46.95 | -121.07 | 2588 | |
| Climax | city | Washington | United States | 46.25 | -118.47 | 1197 | |
| Cline | city | Washington | United States | 48.06 | -117.75 | 2053 | |
| Clinton | city | Washington | United States | 47.98 | -122.36 | 104 | |
| Clinton Park | city | Washington | United States | 47.17 | -122.53 | 278 | |
| Clipper | city | Washington | United States | 48.76 | -122.20 | 334 | |
| Clover Creek Trailer Court | city | Washington | United States | 47.13 | -122.43 | 308 | |
| Clover Park | city | Washington | United States | 47.16 | -122.52 | 295 | |
| Cloverland | city | Washington | United States | 46.25 | -117.25 | 3349 | |
| Clyde | city | Washington | United States | 46.41 | -118.45 | 1669 | |
| Clyde | city | Washington | United States | 47.62 | -122.22 | 26 | |
| Clyde Hill | city | Washington | United States | 47.63 | -122.22 | 200 |