All - Constructed - 1930–1939
| Lower Logging Lake Snowshoe Cabin and Boathouse |
| Lower Toklat River Ranger Cabin No. 18 |
| Lower Windy Creek Ranger Cabin No. 15 |
| Lyons Station |
| Lyons Veterans Administration Hospital Historic District |
| Lyons Woman's Club House |
| MacCallum, Charles, House |
| Madison County Courthouse |
| Magnolia Petroleum Company Filling Station |
| Magnolia Service Station |
| Maidstone State Park |
| Maine Publicity Bureau Building |
| Maisel's Indian Trading Post |
| Malabar Farm |
| Mangas Mountain Lookout Complex |
| Manhattan Company Building |
| Manley School |
| Manti National Guard Armory |
| Many Glacier Barn and Bunkhouse |
| Many Glacier Campground Camptender's Cabin |
| Manzanares, Tony, House |
| Maring, Grace Keiser, Library |
| Marion Bridge |
| Marion Park Pavilion |
| Market Building |
| Marr's Creek Bridge |
| Mars Hill High School |
| Martin Pena Bridge |
| Masonic Temple |
| Masters Building |
| Matagorda County Monument |
| Mattocks, William Edward, House |
| Matt's Place Drive-In |
| Maysville-Aberdeen Bridge |
| McCart Fire Lookout |
| McClatchy, C.K., Senior High School |
| McCook County Courthouse |
| McCullough-Price House |
| McDonogh 19 Elementary School |
| McGehee Hall, Southeastern Louisiana State University |
| McGraw-Hill Building |
| McGraw Ranch |
| McKay, Claude, Residence |
| McKeage, John & Florence, House |
| McKinley County Courthouse |
| McLain Rogers Park |
| McMillin Bridge |
| Medford Post Office |
| Medina City Hall |
| Meeker Town Hall |
| Mendocino Woodlands Recreational Demonstration Area |
| Menno Community Hall |
| Men's Gymnasium-University of Arkansas, Fayetteville |
| Meramec State Park Lookout House/Observation Tower |
| Meramec State Park Pump House |
| Meramec State Park Shelter House |
| Merced Grove Ranger Station |
| Merced Theatre |
| Meridian Hill Park |
| Merrill, Charles W., House |
| Merritt Parkway |
| Mesa House |
| Miami Building |
| Michael's Cabin |
| Michigan Bell Building |
| Michigan Theater |
| Mickey's Diner |
| Middle Haddam School |
| Middleton House |
| Midwest Terminal Building |
| Milam, Ben, Statue |
| Mill Creek Plantation |
| Miller, John, House |
| Minchen, Simon and Mamie, House |
| Minco Armory |
| Miners Ridge Lookout |
| Mingus Lookout Complex |
| Mini-Wakan State Park Historic District |
| Minneapolis Armory |
| Minneapolis Shoal Light Station |
| Minton's Playhouse |
| Mission Nuestra Senora del Refugio Monument |
| M & O Chevrolet Company |
| Monroe City Hall |
| Monroe City Hall |
| Monson's Hoist Bay Resort |
| Montauk State Park Open Shelter |
| Monte Vista Fire Station |
| Monte Vista Lookout Cabin |
| Monte Vista School |
| Montserrat Recreational Demonstration Area Rock Bath House |
| Montserrat Recreation Demonstration Area Bridge |
| Monument Lake Park Building and Hatchery Complex |
| Moose Creek Ranger Cabin No. 19 |
| Moose Entrance Kiosk |
| Moqui Lookout Cabin |
| Moquon Town Hall and Fire Station Complex |
| More Mileage Gas Station |
| Morgan High School Mechanical Arts Building |
| Moroni High School Mechanical Arts Building |
Data from United States Park Service and Wikidata
