| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Coach Country Corral Mobile Home Park | city | Washington | United States | 47.07 | -122.40 | 413 | |
| Coal Creek | city | Washington | United States | 46.20 | -123.02 | 334 | |
| Coal Creek | city | Washington | United States | 47.54 | -122.13 | 830 | |
| Coalfield | city | Washington | United States | 47.50 | -122.12 | 830 | |
| Coey | city | Washington | United States | 47.50 | -117.11 | 2588 | |
| Cohassett | city | Washington | United States | 46.87 | -124.11 | 22 | |
| Cohassett Beach | city | Washington | United States | 46.87 | -124.11 | 16 | |
| Cokedale | city | Washington | United States | 48.52 | -122.17 | 160 | |
| Colbert | city | Washington | United States | 47.83 | -117.34 | 1902 | |
| Colby | city | Washington | United States | 47.53 | -122.55 | 0 | |
| Colchester | city | Washington | United States | 47.55 | -122.54 | 0 | |
| Coles Corner | city | Washington | United States | 47.76 | -120.74 | 1998 | |
| Colfax | city | Washington | United States | 46.88 | -117.36 | 1998 | |
| College Place | city | Washington | United States | 46.05 | -118.39 | 830 | |
| College Place Mobile Home Park | city | Washington | United States | 47.32 | -122.17 | 242 | |
| Colonial Mobile Home Park | city | Washington | United States | 48.42 | -122.31 | 272 | |
| Colton | city | Washington | United States | 46.57 | -117.13 | 2608 | |
| Columbia | city | Washington | United States | 48.97 | -122.16 | 830 | |
| Columbia | city | Washington | United States | 47.56 | -122.28 | 45 | |
| Columbia Beach | city | Washington | United States | 47.97 | -122.35 | 3 | |
| Columbia City | city | Washington | United States | 47.56 | -122.28 | 200 | |
| Columbia Heights | city | Washington | United States | 46.16 | -122.94 | 203 | |
| Columbia Valley Gardens | city | Washington | United States | 46.16 | -122.97 | 203 | |
| Colville | city | Washington | United States | 48.55 | -117.91 | 1669 | |
| Colvos | city | Washington | United States | 47.48 | -122.49 | 226 | |
| Comar | city | Washington | United States | 48.73 | -122.20 | 344 | |
| Conconully | city | Washington | United States | 48.56 | -119.75 | 2509 | |
| Concrete | city | Washington | United States | 48.54 | -121.75 | 239 | |
| Conifer Mobile Home Park | city | Washington | United States | 47.44 | -120.33 | 830 | |
| Conifer Park | city | Washington | United States | 47.52 | -122.60 | 298 | |
| Connell | city | Washington | United States | 46.66 | -118.86 | 898 | |
| Conway | city | Washington | United States | 48.34 | -122.34 | 9 | |
| Cook | city | Washington | United States | 45.71 | -121.66 | 200 | |
| Copalis Beach | city | Washington | United States | 47.11 | -124.17 | 3 | |
| Copalis Crossing | city | Washington | United States | 47.11 | -124.07 | 78 | |
| Coppei | city | Washington | United States | 46.22 | -118.12 | 1669 | |
| Cora | city | Washington | United States | 46.54 | -121.79 | 908 | |
| Cordell | city | Washington | United States | 48.87 | -119.41 | 928 | |
| Corfu | city | Washington | United States | 46.82 | -119.46 | 830 | |
| Corkindale | city | Washington | United States | 48.51 | -121.47 | 239 | |
| Cornet | city | Washington | United States | 48.40 | -122.63 | 39 | |
| Cosmopolis | city | Washington | United States | 46.96 | -123.77 | 45 | |
| Cottage Lake | city | Washington | United States | 47.74 | -122.08 | 200 | |
| Cottonwood Beach | city | Washington | United States | 48.94 | -122.76 | 0 | |
| Cottonwood Mobile Home Park | city | Washington | United States | 47.21 | -122.32 | 98 | |
| Cougar | city | Washington | United States | 46.05 | -122.30 | 830 | |
| Cougar Hills | city | Washington | United States | 47.57 | -122.12 | 830 | |
| Cougar Valley | city | Washington | United States | 47.02 | -121.36 | 5029 | |
| Coulee City | city | Washington | United States | 47.61 | -119.29 | 1669 | |
| Coulee Dam | city | Washington | United States | 47.97 | -118.98 | 1669 | |
| Country Aire Manor Mobile Home Park | city | Washington | United States | 47.10 | -122.30 | 830 | |
| Country Carriage Estates Mobile Home Park | city | Washington | United States | 47.81 | -122.16 | 200 | |
| Country Club Senior Mobile Park | city | Washington | United States | 47.78 | -122.26 | 200 | |
| Country Dale Mobile Home Park | city | Washington | United States | 47.14 | -122.26 | 830 | |
| Country Estates Mobile Home Park | city | Washington | United States | 48.42 | -119.50 | 889 | |
| Country Estates Mobile Home Park | city | Washington | United States | 46.97 | -123.65 | 193 | |
| Country Green Estates Mobile Home Park | city | Washington | United States | 46.94 | -122.40 | 830 | |
| Country Hills Mobile Home Park | city | Washington | United States | 48.37 | -117.84 | 1669 | |
| Country Homes | city | Washington | United States | 47.75 | -117.40 | 1958 | |
| Country Lane | city | Washington | United States | 47.59 | -122.71 | 200 | |
| Country Lane Mobile Home Park | city | Washington | United States | 46.86 | -122.26 | 830 | |
| Country Manor Mobile Home Park | city | Washington | United States | 47.81 | -122.11 | 400 | |
| Country Mobile Estates | city | Washington | United States | 47.11 | -122.43 | 367 | |
| Country Mobile Estates | city | Washington | United States | 48.10 | -122.16 | 78 | |
| Country Mobile Home Court | city | Washington | United States | 48.48 | -122.30 | 29 | |
| Country Place Mobile Home Park | city | Washington | United States | 48.33 | -122.60 | 219 | |
| Country Road Estates Mobile Home Park | city | Washington | United States | 47.07 | -122.31 | 830 | |
| Country Villa Mobile Estates | city | Washington | United States | 48.45 | -117.87 | 1669 | |
| Country West Mobile Home Park | city | Washington | United States | 47.14 | -122.27 | 830 | |
| Countryside Mobile Home Park | city | Washington | United States | 47.63 | -122.64 | 200 | |
| Coupeville | city | Washington | United States | 48.22 | -122.69 | 121 | |
| Courtyard Mobile Home Park | city | Washington | United States | 47.78 | -122.30 | 200 | |
| Covada | city | Washington | United States | 48.22 | -118.21 | 1742 | |
| Cove | city | Washington | United States | 47.45 | -122.51 | 331 | |
| Coveland | city | Washington | United States | 48.23 | -122.74 | 3 | |
| Covello | city | Washington | United States | 46.38 | -117.83 | 2598 | |
| Coville | city | Washington | United States | 48.13 | -123.63 | 255 | |
| Covington | city | Washington | United States | 47.36 | -122.12 | 396 | |
| Cowiche | city | Washington | United States | 46.67 | -120.71 | 1732 | |
| Cowley | city | Washington | United States | 47.50 | -122.46 | 200 | |
| Cowlitz | city | Washington | United States | 46.46 | -122.84 | 232 | |
| Coyle | city | Washington | United States | 47.70 | -122.81 | 121 | |
| Cozy Nook | city | Washington | United States | 48.32 | -117.71 | 2509 |