Idaho - Area of significance: Architecture
| Kress Building |
| Kunze, Rudolf, Barn |
| Kurtz-Van Sicklin House |
| KwikCurb Diner |
| Laine, James H., Barn |
| Laituri, Gust, Homestead |
| Lane School II |
| Largilliere, Edgar Walter, Sr., House |
| Larsen, Archie, House |
| Latham Bungalow |
| Laughlin, Ben, Water Tank House-Garage |
| Lava High School Gymnasium |
| Law, Oren, House and Outbuildings |
| Lawshe, George, Well House |
| LDS Seminary |
| LDS Stake Office Building |
| L.D.S. Ward Building |
| Lee, J.O., Honey House |
| Lee, J. O., House |
| Lemhi County Courthouse |
| Lemmon Hardware Store |
| Lewis Barn |
| Lewis Bungalow |
| Lewis, Fred, Cottage |
| Lewiston City Hall |
| Lewiston Depot |
| Lewiston Historic District |
| Lewiston Methodist Church |
| Lewiston Vineyards Gates |
| Lieuallen, Almon Asbury, House |
| Lincoln-Johnson Avenues Residential Historic District |
| Lincoln School |
| Linvall, J. L., House and Outbuilding |
| Linvall, Robb, House |
| Little, Thomas K., House |
| Lochsa Historical Ranger Station |
| Lockman, Jacob P. House |
| Longfellow School |
| Long Valley Finnish Church |
| Lowell Municipal Pool |
| Lowell School |
| Lower Main Street Commercial Historic District |
| Low, Morris, Bungalow |
| Mackay Episcopal Church |
| Mackay Methodist Episcopal Church |
| MacMillan Chapel |
| Madison County Courthouse |
| Magee Ranger Station |
| Mahala, Jacob and Herman, Homestead |
| Maki, Jacob, Homestead |
| Malad Second Ward Tabernacle |
| Mallard Peak Lookout |
| Mandl, Joseph, House |
| Marks, M. J., House |
| Maxwell, Art and Frieda, Barn |
| McBeth, Sue, Cabin |
| McCammon State Bank Building |
| McCarthy, Judge Charles P., House |
| McCollum, Robert, House |
| McConnell-McGuire Building |
| McConnell, W. J., House |
| McElroy, H. E., House |
| McGinnis, J. S., Building |
| McGuires School |
| McKendrick House |
| McLaren, William and Elizabeth, House |
| Meadows Schoolhouse |
| Meinert Ranch Cabin |
| Memorial Gymnasium |
| Meridian Exchange Bank |
| Methodist Episcopal Church |
| Mickle, Willis, House |
| Middleton Substation |
| Miller, Henry, House |
| Miner's Hat |
| Mitchell Hotel |
| Mittleider Farmstead Historic District |
| Montgomery Ward Building |
| Montpelier Historic District |
| Montpelier Odd Fellows Hall |
| Moore-Cunningham House |
| Moose Creek Administrative Site |
| Morris Hill Cemetery Mausoleum |
| Morse, Burton, House |
| Moscow Carnegie Library |
| Moscow Post Office and Courthouse |
| Moss, A. B., Building |
| Mountain Home Baptist Church |
| Mountain Home Carnegie Library |
| Mountain Home High School |
| Mountain Home Hotel |
| Murphy, Daniel F., House |
| Murphy, W. H., House |
| Murray Courthouse |
| Murray Masonic Hall |
| Myers School |
| Myers, Socrates A., House |
| Nampa American Legion Chateau |
| Nampa and Meridian Irrigation District Office |
| Nampa City Hall |
Data from United States Park Service and Wikidata
