| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Clallam Bay | city | Washington | United States | 48.25472 | -124.25833 | 59 | 75 |
| Claquato | city | Washington | United States | 46.64361 | -123.01611 | 196 | 5854 |
| Clarkston | city | Washington | United States | 46.41639 | -117.04417 | 780 | 21224 |
| Clarkston Heights | city | Washington | United States | 46.39639 | -117.08139 | 1102 | 21224 |
| Classet | city | Washington | United States | 48.38667 | -124.67556 | 803 | 357 |
| Clavton | city | Washington | United States | 47.99694 | -117.55722 | 2253 | 1411 |
| Clay City | city | Washington | United States | 46.92583 | -122.25472 | 639 | 4976 |
| Clayton | city | Washington | United States | 47.99583 | -117.55833 | 2204 | 1411 |
| Cle Elum | city | Washington | United States | 47.19556 | -120.93806 | 1899 | 259 |
| Clear Lake | city | Washington | United States | 48.46444 | -122.23278 | 193 | 12643 |
| Clearbrook | city | Washington | United States | 48.97889 | -122.32111 | 59 | 10649 |
| Clearview | city | Washington | United States | 47.83389 | -122.12472 | 600 | 20200 |
| Clearwater | city | Washington | United States | 47.57778 | -124.29333 | 98 | 54 |
| Cleveland | city | Washington | United States | 45.97083 | -120.35194 | 2998 | 238 |
| Cliffdell | city | Washington | United States | 46.94639 | -121.06778 | 2588 | 235 |
| Climax | city | Washington | United States | 46.24694 | -118.46611 | 1197 | 319 |
| Cline | city | Washington | United States | 48.06222 | -117.75056 | 2053 | 491 |
| Clinton | city | Washington | United States | 47.97861 | -122.35444 | 104 | 5608 |
| Clinton Park | city | Washington | United States | 47.16806 | -122.52722 | 278 | 121138 |
| Clipper | city | Washington | United States | 48.76028 | -122.20083 | 334 | 112 |
| Clover Park | city | Washington | United States | 47.16056 | -122.51944 | 295 | 82745 |
| Cloverland | city | Washington | United States | 46.25056 | -117.24944 | 2946 | 374 |
| Clyde | city | Washington | United States | 47.61528 | -122.21389 | 26 | 76237 |
| Clyde | city | Washington | United States | 46.41139 | -118.44611 | 1276 | 252 |
| Clyde Hill | city | Washington | United States | 47.63194 | -122.21667 | 200 | 77310 |
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