All - Architectural style - Second Empire architecture in the United States and Canada
| Magill, Henry, House |
| Main Building, Vassar College |
| Manning, Joseph K., House |
| Mansard Roof House |
| Mansur, Walter P., House |
| Mary Allen Seminary for Colored Girls, Administration Building |
| Mary McLeod Bethune Council House National Historic Site |
| Masonic Hall and Grand Theater |
| Masonic Temple |
| Mason, Sue Shelby, House |
| Mauer, Dr. Joseph House |
| McCanless, Napoleon Bonaparte, House |
| McCullers, Carson, House |
| McCullough, Charles S., House |
| McDonald-Wait-Newton House |
| McDonough County Courthouse |
| McKusick, Ivory, House |
| McMillan House |
| McWhirter, George and Martha, House |
| Meadly House |
| Messick, Dr. John W., House and Office |
| Miers, Jacob T., House |
| Miller, Fannie Moss, House |
| Miller Hall |
| Millikin, James, House |
| Millspaugh, Glibert, House |
| Mills' Row |
| Missouri Governor's Mansion |
| Montgomery County Courthouse |
| Moore, C. H., House |
| Moran Building |
| Morgan County Courthouse |
| Morgan County Courthouse |
| Morgan, David, House |
| Moriah Town Office Building |
| Morrill Hall, Cornell University |
| Morris-Butler House |
| Mystic Water Works |
| Nast, Thomas, Home |
| Nelson, Luman, House |
| Newark Opera House |
| Newcome, Daniel T., Double House |
| Newhall, Lucian, House |
| Newsom-Marr Farm |
| Newton County Courthouse |
| Noble County Sheriff's House and Jail |
| Norwich Town Hall |
| Oakes, J. J., House |
| Oddfellows Building |
| Odd Fellows Hall |
| Odd Fellows Hall |
| Old City Hall |
| Old Courthouse |
| Old Post Ofice |
| Old U.S. Courthouse and Post Office |
| Orrock, Rev. John, House |
| Osborn Hotel |
| Pabodie, Professor William, House |
| Paine, Robert Treat, Jr., House |
| Palace Hotel |
| Palmer, Judge Augustus C., House |
| Parkesburg National Bank |
| Parry House |
| Partridge-Sheldon House |
| Passmore House |
| Pavillion Hotel |
| Peabody City Hall |
| Peck, Henry M., House |
| Pendleton, George Hunt, House |
| Penniman, Edward, House and Barn |
| Pennington Railroad Station |
| Pennsylvania Academy of the Fine Arts |
| Penn-Wyatt House |
| "Pernot, Henry ""Harry"" Charles, House" |
| Perry-Cooper House |
| Perry, William F., House |
| Phillips Mansion |
| Pierce, Franklin, House |
| Pierce, Jonas J., House |
| Pier, Jan, House |
| Pike County Courthouse |
| Pine Terrace |
| Pinkham House |
| Pinkham, Lydia, House |
| Pollack, Isaac, House |
| Potter Estate |
| Powell, Henry, House |
| Presby Memorial Iris Gardens Horticultural Center |
| Prescott, Benjamin Franklin, House |
| President's Office, George Washington University |
| Price Memorial Hall |
| Proctor, William, House |
| Propst House |
| Providence City Hall |
| Provincetown Public Library |
| Rackleff Building |
| Ragsdale, William A., House |
| Ravenswood |
| Ream, William and Nora, House |
| Red Dragon Canoe Club |
Data from United States Park Service and Wikidata
