| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Coal Creek | city | Washington | United States | 46.20028 | -123.01556 | 334 | 15354 |
| Coal Creek | city | Washington | United States | 47.53694 | -122.12778 | 836 | 79055 |
| Coalfield | city | Washington | United States | 47.50278 | -122.12056 | 429 | 46722 |
| Coey | city | Washington | United States | 47.49806 | -117.11111 | 2588 | 561 |
| Cohassett | city | Washington | United States | 46.87278 | -124.10528 | 22 | 609 |
| Cohassett Beach | city | Washington | United States | 46.86861 | -124.11056 | 16 | 609 |
| Cokedale | city | Washington | United States | 48.52222 | -122.17083 | 160 | 6996 |
| Colbert | city | Washington | United States | 47.82667 | -117.34083 | 1902 | 6977 |
| Colby | city | Washington | United States | 47.53278 | -122.54444 | 0 | 29754 |
| Colchester | city | Washington | United States | 47.54528 | -122.54028 | 0 | 13804 |
| Coles Corner | city | Washington | United States | 47.75639 | -120.73806 | 1998 | 196 |
| Colfax | city | Washington | United States | 46.88028 | -117.36333 | 1998 | 1037 |
| College Place | city | Washington | United States | 46.04944 | -118.38722 | 856 | 20024 |
| Colton | city | Washington | United States | 46.56806 | -117.1275 | 2608 | 178 |
| Columbia | city | Washington | United States | 47.56417 | -122.27417 | 45 | 136589 |
| Columbia | city | Washington | United States | 48.96722 | -122.16167 | 551 | 7343 |
| Columbia Beach | city | Washington | United States | 47.97056 | -122.35 | 3 | 5608 |
| Columbia Heights | city | Washington | United States | 46.16444 | -122.94028 | 203 | 51626 |
| Columbia Valley Gardens | city | Washington | United States | 46.15778 | -122.97361 | 203 | 41177 |
| Colville | city | Washington | United States | 48.54667 | -117.90444 | 1630 | 6162 |
| Colvos | city | Washington | United States | 47.47639 | -122.48944 | 226 | 6814 |
| Comar | city | Washington | United States | 48.73194 | -122.20222 | 344 | 261 |
| Conconully | city | Washington | United States | 48.5575 | -119.74861 | 2349 | 209 |
| Concrete | city | Washington | United States | 48.53944 | -121.745 | 219 | 178 |
| Conifer Park subdivision | city | Washington | United States | 47.52139 | -122.59972 | 298 | 47555 |
| Connell | city | Washington | United States | 46.66361 | -118.86 | 898 | 546 |
| Conway | city | Washington | United States | 48.34056 | -122.34167 | 9 | 6492 |
| Copalis Beach | city | Washington | United States | 47.11278 | -124.1725 | 3 | 600 |
| Copalis Crossing | city | Washington | United States | 47.10806 | -124.06806 | 78 | 1101 |
| Coppei | city | Washington | United States | 46.22194 | -118.12389 | 1666 | 299 |
| Cora | city | Washington | United States | 46.53611 | -121.78889 | 908 | 210 |
| Cordell | city | Washington | United States | 48.86667 | -119.41083 | 928 | 188 |
| Corfu | city | Washington | United States | 46.81528 | -119.45417 | 764 | 453 |
| Corkindale | city | Washington | United States | 48.50889 | -121.4725 | 239 | 173 |
| Cornet | city | Washington | United States | 48.39611 | -122.62833 | 180 | 7543 |
| Cosmopolis | city | Washington | United States | 46.95556 | -123.7725 | 45 | 11861 |
| Cottage Lake | city | Washington | United States | 47.74444 | -122.07611 | 200 | 28095 |
| Cottonwood Beach | city | Washington | United States | 48.94 | -122.75583 | 0 | 3615 |
| Cougar | city | Washington | United States | 46.05167 | -122.29833 | 488 | 1272 |
| Cougar Hills | city | Washington | United States | 47.56528 | -122.11667 | 613 | 68023 |
| Cougar Valley | city | Washington | United States | 47.01972 | -121.35694 | 4940 | 225 |
| Coulee City | city | Washington | United States | 47.61139 | -119.29111 | 1597 | 289 |
| Coulee Dam | city | Washington | United States | 47.96556 | -118.975 | 1315 | 288 |
| Country Homes | city | Washington | United States | 47.74861 | -117.40333 | 1958 | 101901 |
| Country Lane subdivision | city | Washington | United States | 47.58694 | -122.70444 | 200 | 53655 |
| Coupeville | city | Washington | United States | 48.22 | -122.685 | 121 | 10322 |
| Covada | city | Washington | United States | 48.22056 | -118.20778 | 1742 | 108 |
| Cove | city | Washington | United States | 47.45222 | -122.50667 | 331 | 10612 |
| Coveland | city | Washington | United States | 48.23306 | -122.73444 | 3 | 6763 |
| Covello | city | Washington | United States | 46.38333 | -117.83194 | 2598 | 196 |
| Coville | city | Washington | United States | 48.12694 | -123.62806 | 200 | 148 |
| Covington | city | Washington | United States | 47.34833 | -122.11361 | 400 | 35305 |
| Cowiche | city | Washington | United States | 46.67 | -120.71111 | 1732 | 2111 |
| Cowley | city | Washington | United States | 47.49861 | -122.46361 | 200 | 6814 |
| Cowlitz | city | Washington | United States | 46.45889 | -122.84139 | 232 | 2560 |
| Coyle | city | Washington | United States | 47.69806 | -122.80417 | 121 | 1657 |
| Cozy Nook | city | Washington | United States | 48.32417 | -117.70472 | 2316 | 1857 |
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