Washington - Significance region: Local
| Continental Hotel |
| Coolidge-Rising House |
| Cooney, Neil, Mansion |
| Cooper, Frank B., Elementary School |
| Copper Mountain Fire Lookout |
| Corbet-Aspray House |
| Corbin, Daniel C. and Anna, House |
| Corbin Park Historic District |
| Cordova Theater |
| Cornell Farmstead |
| Cottage Avenue Historic District |
| Courthouse and Federal Office Building |
| Courtney Cabin |
| Covenant Beach Bible Camp |
| Cowley Park |
| Creaser Hotel |
| Crow Valley School |
| Curlew School |
| Curran, Charles and Mary Louise, House |
| Cushman Hydroelectric Project Historic District |
| Cushman Substation |
| Custer School |
| Dadisman, David, House |
| Darrington Ranger Station |
| Daughters of the American Revolution-Rainier Chapter House |
| Davidson House |
| Daylight Building |
| Dearborn, Henry H., House |
| Deception Pass State Park-Cornet Bay Fire Circle |
| Deception Pass State Park-Cornet Bay Incinerator |
| Deep River Pioneer Lutheran Church |
| Deer Lick Cabin |
| De La Mar Apartments |
| Delphi School |
| Denver and Rio Grande Western Railroad Business Car No. 101 |
| Desmet Avenue Warehouse Historic District |
| Desolation Peak Lookout |
| Dexter House No. 1 |
| Dexter House No. 2 |
| Dieringer School |
| Dills, Harrison, House |
| Dixie High School |
| Dockton Hotel |
| Dodson Building |
| Doe Bay General Store and Post Office |
| Doe-Kag-Wats |
| Dofflemyer Point Light |
| Donald House |
| Donald-Wapato Bridge |
| Donohue, Michael and Myra, House |
| Dose, Charles P. and Ida, House |
| Dougherty, John and Kate, Farmstead |
| Downtown Bellingham Historic District |
| Downtown Dayton Historic District |
| Downtown Pomeroy Historic District |
| Downtown Waterville Historic District |
| Downtown Wenatchee Historic District |
| Dr. José Rizal Park |
| Dr. Trueblood House |
| Dungeness School |
| Dunn Gardens |
| DuPont Village Historic District |
| Dybdall Gristmill |
| East Downtown Historic District |
| Ebenezer Congregational Church |
| Edgar Rock Lodge |
| Edwards, Joel, House |
| Ehrenberg, Gus and Florence, House |
| Eldridge Building |
| Eldridge Homesite and Mansion |
| Electric Light Works Building |
| Elk Lick Lodge |
| Elks Building |
| Elks Building |
| El Rio Apartment Hotel |
| Emery Farmstead |
| Emmanuel Episcopal Church |
| Enchanted Valley Chalet |
| Engine House No. 11 |
| Engine House No. 13 |
| Engine House No. 4 |
| Engine House No. 8 |
| Engine House No. 9 |
| Eng, Jim and Betty, House |
| Erickson, Jonas and Maria Lovisa, Farmstead |
| Everett Carnegie Library |
| Everett City Hall |
| Everett Fire Station No. 2 |
| Everett High School |
| Fairhaven Library |
| Fairweather-Trevitt House |
| Falls City Masonic Hall |
| Farrell Building |
| Federal Office Building |
| Federal Reserve Bank of San Francisco, Seattle Branch |
| Felts Field Historic District |
| Ferguson, Florence, House |
| Ferry County Courthouse |
| Finch, John A., Memorial Nurses Home |
| Finch, John A., School |
Data from United States Park Service and Wikidata
