Washington - Significance region: Local
| Brooks, Kenneth and Edna, House |
| Brown’s First Addition Historic District |
| Browns Point Lighthouse and Keeper's Cottage |
| Bruce, William Perry, House |
| Buckeye Ranch House |
| Buckley's Addition Historic District |
| Buckner Cabin |
| Buckner Homestead Historic District |
| Building at 1602 South G Street |
| Building at 712-716 Sixth Avenue |
| Bump Block-Bellevue House-Hawthorne Hotel |
| Bumping Lake Cabin No. 16 |
| Bumping Lake Resort |
| Burbank Homestead Waterwheel |
| Burke-Hill Apartments |
| Burlington Carnegie Library |
| Burr Cave |
| Burroughs, Dr. Frank R., House |
| Bush House |
| Butler-Jackson House |
| Butler, Norman Francis, House |
| Butterworth Building |
| Cabin No. 97 |
| Calhoun Hotel |
| California Fruit Store |
| Cambern Dutch Shop Windmill |
| Cambridge Apartments |
| Camlin Hotel |
| Camp Major Hopkins |
| Camp North Bend |
| Canfield, George and Nellie. House |
| Canton, William J., House |
| Capital Savings and Loan Association |
| Carbonneau Mansion |
| Card, Rupert, House |
| Carey, J. W., House |
| Carmichael, Elizabeth Loudon, House |
| Carmichael-Loudon House |
| Carnegie, Andrew, Library |
| Carnegie Library |
| Catlin, Adam, House |
| Center School |
| Central Elementary School |
| Centralia Downtown Historic District |
| Centralia Union Depot |
| Central Schoolhouse (District No. 49) |
| Central Service Station |
| Central Steam Heat Plant |
| Century 21-Washington State Coliseum |
| Chamber's Prairie-Ruddell Pioneer Cemetery |
| Chase, Dr. Reuben, House |
| Chehalis Downtown Historic District |
| Cheney Interurban Depot |
| Cheney Odd Fellows Hall |
| Chiarelli, James and Pat, House |
| Chicago, Milwaukee, St. Paul & Pacific Railroad-Kittitas Depot |
| Chief Sealth High School |
| Chimacum Post Office |
| Chinese Baptist Church |
| Christ Episcopal Church |
| Christian Congregation Church of Port Ludlow |
| Christiansen, George and Blanche, House |
| Chumasero-Smith House |
| Church of the Blessed Sacrament, Priory, and School |
| Cissna Cottages Historic District |
| City Hall |
| City of Cheney Historic District |
| City Ramp Garage |
| Clallam County Courthouse |
| Claquato Church |
| Clark County Courthouse |
| Clark County Poor Farm-Southwestern Washington Experiment Station |
| Clarkston Public Library |
| Clayton School |
| Cle Elum-Roslyn Beneficial Association Hospital |
| Clemmer Theater |
| Clise, James W., House |
| Cloverland Garage |
| Coder-Coleman House |
| Coeur d'Alene Park |
| Coffee Pot Restaurant, The |
| Colbert House |
| Coleman-Furlong House |
| College Hill Historic District |
| College Park Historic District |
| Collins Building |
| Colman Automotive Building |
| Colman Building |
| Colman Park & Dose Terrace Stairs |
| Colonnade Hotel |
| Columbia Building |
| Columbia River Bridge at Northport |
| Columbia River Bridge at Wenatchee |
| Columbia Theater |
| Colville Flour Mill |
| Colvin House |
| Colvos Store |
| Commerce Building |
| Commercial Block |
| Community Center and War Memorial Building |
Data from United States Park Service and Wikidata
