Idaho - Area of significance: Architecture
| Hasbrouck Building |
| Hatch, L. H., House |
| Havens, Bert and Fay, House |
| Hays, Samuel, House |
| Hazelton Presbyterian Church |
| Heigho, Col. E. M., House |
| Hill, Clara, House |
| Hill, Matt N., Homestead Barn |
| Hoffman Barn |
| Hoge, Walter, House |
| Hollingshead Homestead |
| Holy Rosary Church |
| Hood, John, House |
| Hopffgarten House |
| Hopkins, William, House |
| Horse Barn |
| Hosford, Emmett, House |
| Hotel Bovill |
| Hotel Buhl |
| Hotel Idaho |
| Hotel Moscow |
| Hotel Paris |
| Hotel Patrie |
| Hottes, Fred, House |
| Houlder, Ellen, Farm |
| Huer Well House/Water Tank |
| Hulme, Amos, Barn |
| Hunt, Daniel A., House |
| Hunt, E. F., House |
| Huntley, A. O., Barn |
| Hyde Park Historic District |
| Hyde, William A., House |
| Idaho Building |
| Idaho City |
| Idaho Falls City Building |
| Idaho Falls Public Library |
| Idaho Grocery Warehouse and Annex |
| Idaho National Guard Armory |
| Idaho Power Substation |
| Idaho Republican Building |
| Idaho State Forester's Building |
| Idaho State Industrial School Women's Dormitory |
| Idaho State Sanitarium Administration Building |
| Idaho State University Administration Building |
| Idaho State University Neighborhood Historic District |
| Idanha Hotel |
| Immanuel Evangelical Lutheran Church |
| Immanuel Methodist Episcopal Church |
| Independent Order of Odd Fellows Hall |
| Indian Mountain Fire Lookout |
| Indian Springs School II |
| Innes, Kate, House |
| Innes, Thomas, House |
| Intermountain Institute |
| Iona Meetinghouse |
| I.O.O.F. Building |
| I.O.O.F. Hall |
| Jackson, Orville and Floy, House |
| Jacobs, Cyrus, House |
| Jacobsen, N. A., Building |
| Jacobsen, N.A., House |
| Jarvi, Thomas, Homestead |
| Jaussi Bungalow |
| J.C. Penney Company Building |
| Jefferson County Courthouse |
| Jefferson, W. E., House |
| Jerome City Pump House |
| Jerome Cooperative Creamery |
| Jerome County Courthouse |
| Jerome First Baptist Church |
| Jerome National Bank |
| Johnson, Edgar, House |
| Johnson, J. M., House |
| Johnson, John G., (Rintakangas) Homestead |
| Johnson, John S., (Sampila) Homestead |
| Johnson, Louis, Barn |
| Johnson, Louis, Water Tank House |
| Johnson, Quet, Farm |
| Jones, Jedd, House |
| Jones, J. W., Building |
| Jones, T. J., Apartments |
| Kappa Sigma Fraternity, Gamma Theta Chapter |
| Keating, Clarence, House |
| Kehrer, Thomas J., House |
| Keller House and Derick |
| Kelley, Marion and Julia, House |
| Kelly's Hotel |
| Kelsey, Robert, Bungalow |
| Ketchum Ranger District Administrative Site |
| Kettenbach, Henry C., House |
| Kieldson Double House |
| Kinney, Joseph, Mausoleum |
| Kirby, Thomas, House |
| Knights of Pythias Lodge Hall |
| Kohl, W. S., Barn |
| Kootenai County Courthouse |
| Kootenai Inn |
| Korvola, John, Homestead |
| Koski, Charles, Homestead |
| Krassel Ranger Station |
Data from United States Park Service and Wikidata
