Idaho - Area of significance: Architecture
| Braddock Gold Mining and Milling Company Log Building and Forge Ruins |
| Brady Memorial Chapel |
| Breier Building |
| Brick, Frank J., House |
| Brookover, J. Gordon and Barbara J., House |
| Brose, Robert and Augusta, Ranch |
| Browning Block |
| Brown's Creek CCC Camp Barracks |
| Bruneau Episcopal Church |
| Brunzell House |
| Bryant, H. H., Garage |
| Budge, Alfred, House |
| Budge Cottage |
| Budge, Julia, House |
| Budge, Taft, Bungalow |
| Buhl City Hall |
| Buhl IOOF Building |
| Building at 247 Pleasant Avenue |
| Burnett, H. C., House |
| Buster Meat Market |
| Butterfield Livestock Company House |
| Bux's Place |
| Byrne, Tom, House |
| Caldwell Carnegie Library |
| Caldwell Historic District |
| Caldwell Odd Fellow Home for the Aged |
| Caldwell Residential Historic District |
| Callen, Dick, House |
| Campbell, Harry and Fern, House |
| Canyonside School |
| Caribou County Courthouse |
| Carnegie Library |
| Carnegie Public Library |
| Cassia County Courthouse |
| Cataldo Mission |
| Catholic Church of the Sacred Heart |
| Cavanah, C. C., House |
| Cave Lake School |
| Cedar Mountain School |
| Challis Brewery Historic District |
| Challis Cold Storage |
| Challis High School |
| Chase, David C., House |
| Chatcolet CCC Picnic and Camping Area |
| Chesterfield Historic District |
| Children's Home Finding and Aid Society of North Idaho |
| Chinese Odd Fellows Building |
| Chivers, Bill, House |
| Chivers, Thomas, Cellar |
| Chivers, Thomas, House |
| Christ Chapel |
| Christian Church |
| Church of the Assumption |
| Citizens State Bank |
| Clark House |
| Clayton, Russell, Bungalow |
| Coeur d'Alene City Hall |
| Coeur d'Alene Federal Building |
| Coeur d'Alene Garden District Historic District |
| Coeur d'Alene Masonic Temple |
| Coffin, Henry, House |
| Cold Meadows Guard Station |
| Cole House |
| Cole School and Gymnasium |
| Collings, James, Jr., House |
| Collister School |
| Commercial Historic District |
| Congregation Beth Israel Synagogue |
| Cooke, E. V., House |
| Cook, Joseph, House |
| Cook, William H., Water Tank House |
| Co-op Gas & Supply Company |
| Cornwall, Mason, House |
| Cougar Gulch School III |
| Coughanour Apartment Block |
| Council Ranger Station |
| Cowley, Matthias, House |
| Crabtree, Glen and Addie, Cabin |
| Craters of the Moon National Monument Mission 66 Historic District |
| Custer County Jail |
| Custer Historic District |
| Custer Slaughter House |
| Daly, John, House |
| Daniels, O. J., House |
| Darrah, Ben, Water Tank and Well House |
| Darrah House and Water Tank House |
| Dau-Webbenhorst Barn |
| Davey, Harvey M., House |
| Davids' Building |
| Davies, Dr. James, House |
| Davis, E. F., House |
| Davis, R. K., House |
| Day, Ivan W., House |
| Deary Garage |
| Deep Creek Ranger Station |
| Delamar Historic District |
| Dewey, E. H., Stores |
| Dill, Charles W., House |
| Dorman, Henry W. and Ida Frost, House |
| Doughty, George V., House and Garage |
Data from United States Park Service and Wikidata
