Wisconsin - Area of significance: Architecture
| 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, H. S., Bank |
| Miller, Marshall D., Boathouse |
| Mills, Job, Block |
| Mills, Richard W. and Margaret, House |
| Mills, Simeon, House |
| Millston Union Church |
| Milton College Historic District |
| Milton House |
| Milwaukee City Hall |
| Milwaukee County Courthouse |
| Milwaukee County Dispensary and Emergency Hospital |
| Milwaukee County Historical Center |
| Milwaukee County School of Agriculture and Domestic Economy Historic District |
| "Milwaukee-Downer ""Quad""" |
| Milwaukee News Building and Milwaukee Abstract Association Building |
| Milwaukee Normal School-Milwaukee Girls' Trade and Technical High School |
| Milwaukee Road Depot |
| Milwaukee Road Passenger Depot |
| Milwaukee-Western Fuel Company Building |
| Mineral Point Hill |
| Mineral Point Historic District |
| Minneapolis, St. Paul and Sault Saint Marie Railway Depot |
| Minnesota Block-Board of Trade Bldg. |
| Miramar Drive Residential Historic District |
| Mission House Historic District |
| Mitchell, Alexander, House |
| Mitchell Building |
| Mitchell Lewis Building |
| Mitchell-Rountree House |
| Moffat, John S., House |
| Mondeaux Dam Recreation Area |
| Monfils, Joseph, Farmstead |
| 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 |
| 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 |
| Morgan, George E., House |
| Morgan, J. H., House |
| Morgan, John R., House |
| Mottley Family Farmstead |
| 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 |
| Murray-George House |
| Myers-Newhoff House |
| Myers, Peter, Pork Packing Plant and Willard Coleman Building |
| Naeset, Jens, House |
| Nakoma Historic District |
| Namur Belgian-American District |
| Nashold 20-sided Barn |
| Nashotah House Theological Seminary |
| Nathan Strong Park Historic District |
| Near East Side Historic District |
| Needham, Enoch Gardner and Mary Caroline Koch, House |
| Neenah United States Post Office |
| Neese, Elbert, House |
| Neillsville Downtown Historic District |
| Neillsville Masonic Temple Lodge No. 163 |
| Neillsville Standpipe |
| Nelson, Charles E., Sr., House |
| Nelson Hall |
| Neufeld, Albert C. and Ellen H., House |
| Newberry Boulevard Historic District |
| New Coeln House |
| New Glarus Public School and High School |
| Newhall Avenue Pump House and Reservoir |
| New Hope Norwegian Evangelical Lutheran Church and Cemetery |
| New Jersey Building |
| New Richmond Commercial Historic District |
| New Richmond East Side Historic District |
| New Richmond West Side Historic District |
| Nichols, John T., and Margaret, House |
| Nickell, William, A., House |
| Nicolet Public School |
| Nieman, Edwin J., Sr., House |
Data from United States Park Service and Wikidata
