Montana - Area of significance: Architecture
| Lincoln School |
| Linderman, Frank Bird, House |
| Lindley Place Historic District |
| Litening Gas |
| Little Bear School |
| LITTLE CHIEF (boat) |
| Lockhart, Caroline, Ranch |
| Lockridge House |
| Lockridge Medical Clinic |
| Lodge Grass Merchandise Company Store |
| Logan Creek Patrol Cabin |
| Logan Pass Visitor Center |
| Logging Creek Ranger Station Historic District |
| Lohman Block |
| Loneman Fire Lookout |
| Longfellow Grade School |
| Long House |
| Lorraine Apartments |
| Lost Horse Fireman's Cabin (24RA197) |
| Lower Bridger School |
| Lower Logging Lake Snowshoe Cabin and Boathouse |
| Lower Nyack Snowshoe Cabin |
| Lower Park Creek Patrol Cabin |
| Lower Rattlesnake Historic District |
| Lower Willow Creek Rural Historic Landscape District |
| Lucy Building |
| Lundwall, Charles, Building |
| Madison County Fairgrounds |
| Madison Grade School |
| Madison Hotel and Cafe |
| Main Boulder Ranger Station |
| Main Street Historic District |
| Main Street Historic District |
| Malmborg School |
| Manley’s General Store |
| Many Glacier Barn and Bunkhouse |
| Many Glacier Campground Camptender's Cabin |
| Many Glacier Hotel Historic District |
| Marcus, Dr. Carl, House |
| Marcyes, Claude O., House |
| Margaret Block |
| Marsh and Powell Funeral Home |
| Masonic Building |
| Masonic Lodge |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Matheson, Duncan, House |
| Maudlow School |
| May, Albert, House |
| May, Charles, House |
| May, George, House |
| May, Harry, House |
| May, Louis, House |
| McCall, Tracy, House |
| McCrossin, James, Cabin |
| McFarlane House |
| McGee House |
| McGlauflin House |
| McKinley Elementary School |
| McLaughlin, John, House |
| McMannamy House and Rental Properties |
| McMaster Ranch Historic District |
| McMullen Hall |
| Meadowbrook Stock Farm |
| Medicine Point Lookout |
| Merrill Avenue Historic District |
| Metcalf House |
| Methodist Church of Alberton |
| Methodist Episcopal Church |
| Methodist Episcopal Church |
| Methodist Episcopal Church and Parsonage |
| Methodist Episcopal Church of Anaconda |
| Methodist-Episcopal Church of Marysville |
| Methodist Episcopal Church South |
| Miles, George M., House |
| Miller, J. K., Homestead |
| Mill House |
| Milwaukee Depot |
| Milwaukee Road Historic District |
| Mineral Peak Lookout |
| Miners Union Hall |
| MISCO Grain Elevator |
| Missoula County Courthouse |
| Missoula County Fairgrounds Historic District |
| Missoula Downtown Historic District |
| Missoula Laundry Company |
| Missoula Mercantile |
| Missoula Southside Historic District |
| Model Laundry and Apartments |
| Modern Hotel |
| Monarch Depot Historic District |
| Moncure Tipi |
| Montana Aeronautics Commission Operations Historic District |
| Montana Deaf and Dumb Asylum |
| Montana National Bank |
| Montana State Arsenal, Armory and Drill Hall |
| Montana State Capitol Building |
| Montana State Capitol Campus Historic District |
| Montana State Normal School |
Data from United States Park Service and Wikidata
