Idaho - Criteria: A (event)
| Adams County Courthouse |
| Administration Building, University of Idaho |
| A. F. R. Building |
| Ah Toy Garden |
| Aiken's Hotel |
| Albion Normal School Campus |
| Alexanders |
| American Women's League Chapter House |
| Amustutz Apartments |
| Anchustegui, Pedro, Pelota Court |
| Anduiza Hotel |
| Arctic Point Fire Lookout |
| Arrowrock Dam |
| Artesian Water Co. Pumphouse and Wells |
| Asposas, James, House |
| Assay Office |
| Atlanta Ranger Station Historic District |
| Avery Depot |
| Baker, James V. and Sophia, House |
| Bank of Juliaetta |
| Barber Dam and Lumber Mill |
| Bayhorse |
| Bayview School II |
| Bear Lake Market |
| Bear River Battleground |
| Beckman, Oscar and Christina, Farmstead |
| Bemis, Polly, House |
| Benewah County Courthouse |
| Bernard's Ferry |
| Bethany Deaconess Hospital |
| Big Cedar School |
| Big Creek Commissary |
| Big Falls Inn |
| Bishop Mountain Lookout |
| Blackfoot Railway Depot |
| Blaine County Courthouse |
| Blatchley Hall |
| Blue Fox Theatre |
| Boarding House |
| Boise Capitol Area District |
| Boise Historic District |
| Boise Junior College Administration Building |
| Bonneville County Courthouse |
| Booth, Frank, House |
| Boulevard Mo-tel |
| Boundary County Courthouse |
| Bovill Opera House |
| Bowlby, T. P., Barn |
| Bown, Joseph, House |
| Browning Block |
| Brown's Creek CCC Camp Barracks |
| Budge, Alfred, House |
| Buhl IOOF Building |
| Bullion Tunnel |
| Burgdorf |
| Bushnell-Fisher House |
| Butts Point Creek Fire Lookout |
| Cabin Creek Ranch |
| Caldwell Carnegie Library |
| Caldwell Historic District |
| Camas Meadow Camp and Battle Sites |
| Cambridge News Office |
| Campbell's Ferry |
| Canyonside School |
| Capitol Boulevard Memorial Bridge |
| Carey Dome Fire Lookout |
| Caribou County Courthouse |
| Carnegie Library |
| Cassia County Courthouse |
| Cataldo Mission |
| Catholic Church of the Sacred Heart |
| Cedar Draw School |
| Cedar Snags |
| Celadon Slope Garden |
| Challis Brewery Historic District |
| Chamberlain Ranger Station Historic District |
| Charcoal Kilns |
| Chase, Eben S. and Elizabeth S., House |
| Chatcolet CCC Picnic and Camping Area |
| Chesterfield Historic District |
| Chicago, Milwaukee, St. Paul and Pacific Railroad Company Historic District |
| Children's Home Finding and Aid Society of North Idaho |
| Chinese Cemetery |
| Chi-Sandra Garden |
| Chitwood, Joseph, House |
| Christ Chapel |
| Church of the Assumption |
| City of Rocks |
| Coeur d'Alene Mission of the Sacred Heart |
| Cole School and Gymnasium |
| Collister School |
| Commercial Historic District |
| Congregation Beth Israel Synagogue |
| Co-Op Block and J. N. Ireland Bank |
| Cordelia Lutheran Church |
| Cougar Gulch School III |
| Council Ranger Station |
| Cox Barn |
| Crane, Silas W., and Elizabeth, House |
| Dau-Webbenhorst Barn |
Data from United States Park Service and Wikidata
