Idaho - Criteria: C (architecture/engineering)
| 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 |
| Callen, Dick, House |
| Campbell, Harry and Fern, House |
| Canyonside School |
| Capitol Boulevard Memorial Bridge |
| Caribou County Courthouse |
| Carnegie Library |
| Carnegie Public Library |
| Cassia County Courthouse |
| Cataldo Mission |
| Catholic Church of the Sacred Heart |
| Cavanah, C. C., House |
| Challis Brewery Historic District |
| Challis Cold Storage |
| 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 Masonic Temple |
| Coffin, Henry, House |
| Cold Meadows Guard Station |
| Cold Springs Pegram Truss Railroad Bridge |
| Cole House |
| Cole School and Gymnasium |
| Collings, James, Jr., House |
| Collister School |
| Commercial Historic District |
| Conant Creek Pegram Truss Railroad Bridge |
| Congregation Beth Israel Synagogue |
| Cooke, E. V., House |
| Cook, Joseph, House |
| Cook, William H., Water Tank House |
| Cornwall, Mason, House |
| Cougar Gulch School III |
| Coughanour Apartment Block |
| Council Ranger Station |
| Cowley, Matthias, House |
| Crabtree, Glen and Addie, Cabin |
| 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, R. K., House |
| Day, Ivan W., House |
| Deep Creek Ranger Station |
| Delamar Historic District |
| Dewey, E. H., Stores |
| Diversion Dam and Deer Flat Embankments |
| Dorman, Henry W. and Ida Frost, House |
| Doughty, George V., House and Garage |
| Douglas-Farr Building |
| Drake, Col. C. F., House |
| Dunbar, William, House |
| Dunton, Minnie Preist, House |
| Duquesne, Achille, House |
| East Side Downtown Historic District |
| Echevarria, Pedro, House |
| Edwards-Gillette Barn |
| Eichelberger Apartments |
| Elks Temple |
| Elmore County Courthouse |
| Elo School |
| Emmanuel Episcopal Church |
| Emmett Presbyterian Church |
| Enders Hotel |
| Episcopal Church of the Redeemer |
| Epperson, George, House |
| Erdman, G. H., House |
| Eskelton, Alvin, Barn |
| Evans, D. L., Sr., Bungalow |
| Falls City School House |
Data from United States Park Service and Wikidata
