All - Architectural style - rustic architecture
| Indian Rocks Dining Hall |
| Iowa Lakeside Laboratory Historic District |
| Ipsut Creek Patrol Cabin |
| Isabella Ranger Station |
| Island of Happy Days |
| Issaquah Sportsmen's Club |
| Itasca State Park |
| Jackson-Einspahr Sod House |
| Jackson Hole American Legion Post No. 43 |
| Jackson Lake Ranger Station |
| John Day Compound, Supervisor's Warehouse |
| Johnston-Truax House |
| Jorgenson, Chris, Studio |
| Kanawha Hotel |
| Kauffman House |
| Kennicott Cabin |
| Kern's Fort |
| Keweenaw Mountain Lodge and Golf Course Complex |
| Killgore Fort House |
| Kintla Lake Ranger Station |
| Kirkland Lookout Ground House (Guard Station) |
| Kishenehn Ranger Station Historic District |
| Kluge House |
| Lake Agnes Cabin |
| Lake George Patrol Cabin |
| Lake McDonald Lodge |
| Lake McDonald Lodge Historic District |
| Lakeside Park Historic District |
| Lamar Buffalo Ranch |
| Lamb Creek School |
| Lamonta Compound-Prineville Supervisor's Warehouse |
| Land's End Observatory |
| La Wis Wis Guard Station No. 1165 |
| Leavenworth Ranger Station |
| LeConte Memorial Lodge |
| Leiffer House |
| Leigh Lake Ranger Patrol Cabin |
| Lewis and Clark Caverns Historic District |
| Libby Lodge |
| Lindbergh, Charles A., House and Park |
| Lodgepole Community Hall |
| Logan Creek Patrol Cabin |
| Log Cabin Motel |
| Logging Creek Ranger Station Historic District |
| Loneman Fire Lookout |
| Longmire Historic District |
| Loomis Vistor Center, Bldg. 43 |
| Lost Lake Guard Station |
| Lower East Fork Ranger Cabin No. 9 |
| Lower Logging Lake Snowshoe Cabin and Boathouse |
| Lower Nyack Snowshoe Cabin |
| Lower Park Creek Patrol Cabin |
| Lower Toklat River Ranger Cabin No. 18 |
| Lucas, Geraldine Homestead-Fabian Place Historic District |
| Lummis House |
| Madison Museum |
| Manges Cabin |
| Manning Cabin |
| Many Glacier Barn and Bunkhouse |
| Many Glacier Hotel Historic District |
| Mars Hill |
| Martin, Isaie and Scholastique, House |
| Mary Jane Colter Buildings (Hopi House, The Lookout, Hermit's Rest, and the Desert View Watchtower) |
| Mason-Drennen House |
| Massacoe Forest Pavilion |
| Mathias, John, House |
| May-Kraus Farm |
| McCarthy Homestead Cabin |
| McCausland, Gen. John, House (Boundary Increase) |
| McClung's Price Place |
| McGregor, George, Cabin |
| McKenzie, David, Log Cabin |
| Media Farm |
| Menno Community Hall |
| Menor's Ferry |
| Merced Grove Ranger Station |
| Mercer Log House |
| Michael's Cabin |
| Middle Mountain Cabins |
| Middleway Historic District |
| Miller, George, House |
| Mission Church |
| Monjeau Lookout |
| Moran Bay Patrol Cabin |
| Morgan, Edward, Log House |
| Morgan-Gold House |
| Morgan's Grove |
| Mormon Row Historic District |
| Morton Homestead |
| Moss Ledge |
| Mount Brown Fire Lookout |
| Mowich Lake Patrol Cabin |
| Mt. Fremont Fire Lookout |
| Municipal Swimming Pool |
| Murie Ranch Historic District |
| Narada Falls Bridge |
| Narada Falls Comfort Station |
| National Park Service Housing, Old, Historic District |
| Newton County American Legion Post No. 89 Hut |
| Nisqually Entrance Historic District |
Data from United States Park Service and Wikidata
