Montana - Role: Building
| House at 813 W. Watson |
| House at 818 South Eighth |
| House at 916 Preston Avenue |
| House of the Good Shepherd Historic District |
| House on Railroad Avenue |
| Houtz House |
| Hovda, Oliver H., House |
| Howard Lepper Memorial Hall |
| Howard School |
| Howe, John G., House |
| Hoyt House |
| Huckleberry Fire Outlook |
| Huntley Project Office |
| Huntoon Residence |
| Huseby, John H,. House |
| Independent Telephone Company Building |
| Ingomar Public School |
| IOOF Hall |
| IOOF Hall and Fromberg Co-operative Mercantile Building |
| IOOF Lodge |
| Ismay Jail |
| Izaak Walton Inn |
| Jacobs, Michael, House |
| James F. Battin Federal Building (Courthouse & Federal Office Building) |
| Jefferson County Courthouse |
| Johnson House |
| Johnson-Lee House |
| Johnston, John S., House |
| Joliet High School |
| Kalispell-American Laundry |
| Kalispell Flour Mill |
| Kalispell Monumental Company |
| Kate Fratt Memorial Parochial School |
| Keith, Harry C., House |
| Keith, John M., House |
| Kemna, Herman, House |
| Kennedy Building |
| Kent Dairy Round Barn |
| Kerr House |
| Ketterer, Emil, House |
| Kevin Depot |
| Kiwanis Meeting Hall |
| Kleinschmidt, T. H., House |
| Kluge House |
| Knowles Building |
| Kohrs, William K., Free Memorial Library |
| Kolble House |
| Kootenai Creek Snowshoe Cabin |
| Kopriva, Francis, House |
| Kose Hall |
| KPRK Radio |
| Krohne Island House |
| Krohne Spring House |
| Krug, Charles, House |
| Kruse, Billy, Cabin |
| Labor Temple |
| Lagerquist, John, House |
| Lake McDonald Lodge Coffee Shop |
| Lancaster House |
| L and L Building |
| Landram, John A., House |
| LaPierre Barn |
| Larsen, Aage and Kristine, Homestead |
| Lavina State Bank |
| Lee Creek Snowshoe Cabin |
| Lee Homestead |
| Leibig House |
| Lenox Flats |
| Lewis, Samuel, House |
| Lewistown Carnegie Library |
| Lewistown Merchantile Company |
| Libby High School |
| Lincoln Community Hall |
| Lincoln Creek Snowshoe Cabin |
| Lincoln Lodge |
| Lincoln School |
| Linderman, Frank Bird, House |
| Litening Gas |
| Little Bear School |
| Livingston Memorial Hospital |
| Lockhart, Caroline, Ranch |
| Lockridge House |
| Lockridge Medical Clinic |
| Lodge Grass City Jail |
| Lodge Grass Merchandise Company Store |
| Lodgepole Community Hall |
| Logan Creek Patrol Cabin |
| Logan Pass Visitor Center |
| Lohman Block |
| Loneman Fire Lookout |
| Lonesomehurst Cabin |
| Lonetree |
| 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 |
Data from United States Park Service and Wikidata
