Missouri - Criteria: C (architecture/engineering)
| Moore, J. Herbert, House |
| Moore, Thomas, House |
| Moreau Drive Historic District |
| Moreau Park Historic District |
| More Automobile Company Building |
| Morgan County Courthouse |
| Morrison, Alfred W., House |
| Morrow, Johnson, House |
| Morton-Myer House |
| Mountain Grove Bandstand |
| Mount Horeb Baptist Church |
| Mount Mora Cemetery |
| Mount Nebo Baptist Church |
| Mount Pleasant School |
| Mount Washington School |
| Mount Zion Church and Cemetery |
| Mount Zion Lodge Masonic Temple |
| Mt. Carmel Historic District |
| Mt. Memorial Cemetery |
| Mt. Pleasant Winery Historic District |
| Mudd's Grove |
| Mule Barn Theatre |
| Municipal Courts Building |
| Munro, John Manson, House |
| Murdock, C.A., Manufacturing Company Building |
| Murphy, Joseph and Ann, Residence |
| Murphysburg Historic District |
| Murrell, George A., House |
| Myers, George J., House |
| Myers, John B., House |
| National Bank of Commerce Building |
| Neely Elementary School |
| Neighborhood Gardens Apartments |
| Nelson, Thomas, House |
| Neosho Commercial Historic District |
| Neosho High School |
| Netter-Ullman Building |
| Newbern Hotel |
| Newbill-McElhiney House |
| Newcomer's, D. W., Sons Funeral Home |
| New Franklin Commercial Historic District |
| New Haven Commercial Historic District |
| New Haven Residential Historic District |
| New Hope Primitive Baptist Church |
| New Lebanon Cumberland Presbyterian Church and School |
| New Lebanon Historic District |
| Newman Brothers Building |
| New Mount Sinai Cemetery |
| New York Life Building |
| Nichols Farm District |
| Nicholson, George E., House |
| Nicolay House |
| Nims Mansion |
| Nipher, Prof. Frances e., House |
| Nodaway County Courthouse |
| Noland, Smallwood V., House |
| Norris, Jewett, Library |
| Northern Methodist Episcopal Church of Clarksville |
| North, James, House |
| North Main Street Historic District |
| North Main Street Historic District |
| North Ninth Street Historic District |
| North Third Street Historic District |
| Norwood Hills Country Club |
| Oakwood |
| O'Bannon Homestead |
| Odd Fellows Home District |
| O'Hara, Mark, House |
| Old Appleton Bridge |
| Old Barnhill Building |
| Old Calabosse |
| Old California City Hall and Fire Station |
| Old City Hall |
| Old Gerald School |
| Old Laclede Gas and Light Company Building |
| Old Lorimier Cemetery |
| Old Neighborhoods Historic District |
| Old New England Building |
| Old Rock House |
| Old Stone Church |
| Old Stone Hill Historic District |
| Old St. Patrick's Church |
| Olean Railroad Depot |
| Olive Chapel African Methodist Episcopal Church |
| Oliver-Leming House |
| Olivia Apartments |
| Opera Hall Block |
| Osceola Public School Building |
| Ostertag, Robert, House |
| Our Lady of Perpetual Help Parish Hall, School, Convent, and Rectory |
| Overfelt-Campbell-Johnston House |
| Owens, Given, House |
| Owens-McCoy House |
| Ozark Courthouse Square Historic District |
| Palace Clothing Company Building |
| Palace Hotel |
| Panhorst Feed Store |
| Papinville Marais des Cygnes River Bridge |
| Pappas, Theodore, A., House |
| Parade Park Maintenance Building |
Data from United States Park Service and Wikidata
