Montana - Criteria: A (event)
| Holy Rosary Hospital |
| Home of Peace |
| Hornaday Camp |
| Hornet Lookout |
| Hospital |
| Hotel Baxter |
| Hotel Metlen |
| Hotel Norden |
| Howard School |
| Huckleberry Fire Outlook |
| Huntley Bridge |
| Huntley Project Office |
| Huseby, John H,. House |
| Hutchins Bridge |
| Independent Telephone Company Building |
| Ingomar Public School |
| IOOF Hall |
| IOOF Hall and Fromberg Co-operative Mercantile Building |
| IOOF Lodge |
| Ismay Jail |
| Izaak Walton Inn |
| Jefferson County Courthouse |
| Joliet Bridge |
| Judith River Ranger Station |
| Kalispell-American Laundry |
| Kalispell Flour Mill |
| Kalispell Monumental Company |
| Kelly's Camp Historic District |
| Kemna, Herman, House |
| Kennedy Building |
| Kent Dairy Round Barn |
| Kevin Depot |
| Kintla Lake Ranger Station |
| Kishenehn Ranger Station Historic District |
| Kiwanis Meeting Hall |
| Kohrs, William K., Free Memorial Library |
| Kootenai Creek Snowshoe Cabin |
| Kootenai Lodge Historic District |
| Kose Hall |
| Labor Temple |
| Lake McDonald Lodge Coffee Shop |
| Lake McDonald Lodge Historic District |
| L and L Building |
| LaPierre Barn |
| Larsen, Aage and Kristine, Homestead |
| Laurel Downtown Historic District |
| Lavina State Bank |
| Lee Creek Snowshoe Cabin |
| Lenox Flats |
| Lewis and Clark Bridge |
| Lewis and Clark Caverns Historic District |
| Lewis and Clark County Hospital Historic District |
| Lewis, Samuel, House |
| Lewistown Carnegie Library |
| Lewistown Central Business Historic District |
| Lewistown Courthouse Historic District |
| Lewistown Merchantile Company |
| Lewistown Silk Stocking District |
| Libby High School |
| Lincoln Community Hall |
| Lincoln Creek Snowshoe Cabin |
| Lincoln School |
| Little Bear School |
| Little Bighorn Battlefield National Monument |
| Little Blackfoot River Bridge |
| Livingston Memorial Hospital |
| Locate Creek Bridge |
| Lodge Grass City Jail |
| Lodge Grass Merchandise Company Store |
| Lodgepole Community Hall |
| Logan Creek Patrol Cabin |
| Logan Pass Visitor Center |
| Logging Creek Ranger Station Historic District |
| Loneman Fire Lookout |
| Lonesomehurst Cabin |
| Lonetree |
| 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 |
| Lundwall, Charles, Building |
| MacHaffie Site (24JF4) |
| Maclay Bridge |
| Madison Hotel and Cafe |
| Main Street Historic District |
| Malmborg School |
| Mann Gulch Wildfire Historic District |
| Many Glacier Barn and Bunkhouse |
| Many Glacier Campground Camptender's Cabin |
| Many Glacier Hotel Historic District |
| Marcyes, Claude O., House |
| Marias River Bridge |
| Marsh and Powell Funeral Home |
| Masonic Building |
| Masonic Lodge |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
Data from United States Park Service and Wikidata
