Washington - Criteria: C (architecture/engineering)
| 12th Avenue South Bridge |
| 1411 Fourth Avenue Building |
| 14th Avenue South Bridge |
| Adair, William and Estella, Farm |
| ADVENTURESS |
| Aftermath Clubhouse |
| Agate Pass Bridge |
| Agen Warehouse |
| Albers Brothers Mill |
| Allen, Horatio and Laura, Farm |
| Altair Campground Community Kitchen |
| Amboy United Brethren Church |
| American Veterans Building-Hoquiam |
| Amman |
| Appleton Log Hall |
| Arboretum Sewer Trestle |
| Arctic Building |
| ARTHUR FOSS (tugboat) |
| Ashford House |
| Assay Office |
| Auburn Post Office |
| Auburn Public Library |
| Aurora Avenue Bridge |
| Backus-Marblemount Ranger Station House No. 1009 |
| Backus-Marblemount Ranger Station House No. 1010 |
| Bacon, George H., House |
| Badger Mountain Lookout |
| Ballard Avenue Historic District |
| Ballard Bridge |
| Ballard Carnegie Library |
| Ballard-Howe House |
| Ballinger, Richard A., House |
| Barnes Building |
| Barstow Bridge |
| Basalt Cobblestone Quarries District |
| Beaver Pass Shelter |
| Bell Apartments |
| Bellingham Herald Building |
| Bellingham National Bank Building |
| Benewah Milk Bottle |
| Berthusen Barn and Privy |
| Beverly Railroad Bridge |
| Black, Alfred L., House |
| Black Diamond Cemetery |
| Blomeen, Oscar, House |
| Blue Mouse Theatre |
| Bon Marche Department Store |
| Bothell Pioneer Cemetery |
| Botten Cabin |
| Boundary Hydroelectric Project |
| Bowles, Jesse C., House |
| B. P. O. E. Building |
| Brackett, E. William, House |
| Brandes House |
| Bremerton Elks Temple Lodge No. 1181 Building |
| Breslin |
| Bridge Creek Cabin-Ranger Station |
| Bridge Creek Shelter |
| Browne's Addition Historic District |
| Browns Point Lighthouse and Keeper's Cottage |
| Bump Block-Bellevue House-Hawthorne Hotel |
| Burroughs, Dr. Frank R., House |
| Butterworth Building |
| Calhoun Hotel |
| California Fruit Store |
| Cama Beach Resort |
| Cambern Dutch Shop Windmill |
| Camlin Hotel |
| Campbell House |
| Camp Major Hopkins |
| Camp Muir |
| Canyon Creek Shelter |
| Capitol Theatre |
| Carey, J. W., House |
| Carnegie Library |
| Centralia Downtown Historic District |
| Central Service Station |
| Central Steam Heat Plant |
| Central Whidbey Island Historic District |
| Chase, Dr. Reuben, House |
| Chatter Creek Guard Station |
| Chelan Butte Lookout |
| Chicago, Milwaukee, St. Paul and Pacific Railroad: South Cle Elum Yard |
| Chinook Pass Entrance Arch |
| Chittenden Locks and Lake Washington Ship Canal |
| Christ Episcopal Church |
| Christine Falls Bridge |
| Church of the Blessed Sacrament, Priory, and School |
| City Ramp Garage |
| City Waterway Bridge |
| Clallam County Courthouse |
| Clark Mansion |
| Clarkston Public Library |
| Clise, James W., House |
| Cloverland Garage |
| Cobb Building |
| Coke Ovens |
| Colbert House |
| Coliseum Theater |
| College Hill Historic District |
Data from United States Park Service and Wikidata
