All - Architectural style - Prairie School architecture
| Lougee, George A., House |
| Louisville, Henderson, and St. Louis Railroad Depot |
| Luttjohann, Fred and Cora, House |
| Lyles Consolidated School |
| MacCallum, Charles, House |
| MacMillan-Dilley House |
| Madlener, Albert F., House |
| Maegly, A. H., House |
| Mahnke House |
| Manautou House |
| Maple Court Apartments |
| Margaret Block |
| Marine Chapter House |
| Markeen Apartments |
| Martin, Darwin D., House |
| Martin, T.S., and Company |
| Martzahn, August F., House |
| Masonic Temple Building |
| Masonic Temple Building |
| Mason, Walt, House |
| Matthews Hall |
| Maynard, Powell C., House |
| Maynard, W. E., House |
| McAllister,James G., House |
| McCain, Henry Hicks, House |
| McCarthy, Judge Charles P., House |
| McCartney House |
| McDaniel, George W. and Lavina, House |
| McGraw, James J., House |
| McGregor Apartments |
| McManus, George, House |
| McRae House |
| Medford Free Public Library |
| Melrose Apartment Building |
| Merchants National Bank |
| Merrill House |
| Merrium Apartments |
| Methodist Episcopal Church, South |
| Millard, George Madison, House |
| Miller, Allan, House |
| Millikan, Robert A., House |
| Milne, John, House |
| Mineral Hall |
| Missouri-Kansas-Texas Company Railroad Station |
| Mitchell, Charles T., House |
| Mitchell, James, School |
| Mohr and Yoerk Market |
| Monroe County Bank Building |
| Moore, Col. Hugh B. and Helen, House |
| Morocco Temple |
| Mosher House |
| Mount Barbara |
| Mount Horeb Public School |
| Mount Pleasant Carnegie Library |
| Mount Sinai Temple |
| Mount View |
| Mount Zion Baptist Church |
| Myers House |
| Naff House |
| National Farmers' Bank |
| Neessen, Chris, House |
| New Lawn, The |
| Newsome-King House |
| Nichol House |
| Nicolas Street School |
| Norris, F. M., House |
| North Fort Worth High School |
| Novy, Joe, House |
| Number 4 Hook and Ladder Company |
| Oak Circle Historic District |
| Oberhoffer, Emil J., House |
| Old Fellwock Auto Company |
| Oldham, Mary and Frank House |
| Old Second National Bank |
| Olean School #10 |
| Olive Hill C & O Depot |
| Onawa Public Library |
| Orendorff, Ulysses G., House |
| Orth House |
| Oskaloosa Monthly Meeting of Friends Parsonage |
| Otis Hospital |
| Owre, Dr. Oscar, House |
| Oxsheer, Fountain G. and Mary, House |
| Page, Paul D., House |
| Palestine Carnegie Library |
| Paris Public School |
| Park Addition School |
| Parker and Weeter Block |
| Parker, Charles and Grace, House |
| Park Inn Hotel |
| Park, William, House |
| Pauley Apartments |
| Peery Apartments |
| Peoples Building & Loan Building |
| Peoria State Hospital |
| Perkins, Dwight, House |
| Pettit Memorial Chapel |
| Phillips, E. F., House |
| Plainview Carnegie Library |
| Pleasant Home |
Data from United States Park Service and Wikidata
