Wisconsin - Significance region: Local
| Melchoir Hotel and Brewery Ruins |
| Mellen City Hall |
| Melster, John and Florence, House |
| Melvin Avenue Residential Historic District |
| Memorial Hall |
| Memorial Hall |
| Menomonee Golf Club |
| Menomonie Downtown Historic District |
| Menomonie Omaha Depot |
| Merchant Row Historic District |
| Merchants Avenue Historic District |
| Merrell, Henry, House |
| Merrill Avenue Historic District |
| Merrill City Hall |
| Merrill, Levi, House |
| Merrill Post Office |
| Merrill Springs Mound Group II Archeological District |
| Merritt, Samuel T., House |
| Merten, Charles, House |
| Messer-Mayer Mill |
| Methodist Episcopal Church |
| Metropolitan Block |
| Meyer, Henry A., House |
| Meyerhofer Cobblestone House |
| Meyer, Starke, House |
| Middleton Depot, Chicago, Milwaukee, and St. Paul Railroad |
| Mielke, Joseph, House |
| Miller-Davidson House |
| Miller, Henry, House |
| Miller House |
| Miller House |
| Miller, H. S., Bank |
| Miller, Marshall D., Boathouse |
| Mills, Job, Block |
| Mills, Richard W. and Margaret, House |
| Mills, Simeon, House |
| Millston Union Church |
| Mills Woods Mound |
| Milwaukee Athletic Club |
| Milwaukee Breakwater Light |
| Milwaukee City Hall |
| Milwaukee County Historical Center |
| Milwaukee County Home for Dependent Children-Administriation Building |
| Milwaukee County School of Agriculture and Domestic Economy Historic District |
| Milwaukee Falls Lime Company |
| Milwaukee Hospital |
| Milwaukee Jewish Home for the Aged |
| Milwaukee Journal Complex |
| Milwaukee News Building and Milwaukee Abstract Association Building |
| Milwaukee Paper Box Company |
| Milwaukee Pierhead Light |
| Milwaukee Protestant Home for the Aged |
| Milwaukee River Parkway |
| Milwaukee Road Depot |
| Milwaukee Road Passenger Depot |
| Milwaukee-Western Fuel Company Building |
| Mindoro Cut |
| Minertown-Oneva |
| Minneapolis, St. Paul and Sault Saint Marie Railway Depot |
| Minnesota Block-Board of Trade Bldg. |
| Miramar Drive Residential Historic District |
| Mirro Aluminum Company Plant No. 3 |
| Mitchell, Alexander, House |
| Mitchell Building |
| Mitchell Lewis Building |
| Modern Woodmen of America Lodge |
| Monfils, Joseph, Farmstead |
| Monona Mound (47DA275) |
| Monroe Commercial District |
| Monroe County Courthouse |
| Monroe Water Tower |
| Montello Commercial Historic District |
| Moody's Camp Lodge |
| Moon, D. R., Memorial Library |
| Moore, Dr. Volney L., House |
| Moore Mound Group |
| Moose Temple |
| Moquon Town Hall and Fire Station Complex |
| Moran's Saloon |
| Moreland Boulevard Pump House and Reservoir |
| Morey-Andrews House |
| Morey-Lewis House |
| Morey-Seidens House |
| Morey, Theodore I. and Margaret, House |
| Morgan, George E., House |
| Morgan, J. H., House |
| Morgan, John R., House |
| Morty Site (47AS40) |
| Mottley Family Farmstead |
| Mountain Fire Lookout Tower |
| Mountain School |
| Mount Horeb Public School |
| Mt. Horeb Opera Block |
| Mueller-Wright House |
| Muirdale Tuberculosis Sanatorium |
| Mulberry Street Residential Historic District |
| Mumbrue-Penney House |
| Mundstock, Carl August, Farm |
| Murphy Farms Number 1 |
| Murray, George, House |
Data from United States Park Service and Wikidata
