All - Architectural style - Neoclassical architecture
| Lowell Elementary School |
| Low Memorial Library, Columbia University |
| Lowndes County Courthouse |
| Loyd Hall Plantation |
| Lubbock Post Office and Federal Building |
| Luce Hall |
| Luckey, Platt & Company Department Store |
| Lumber Exchange Building |
| Lumsden-Boone Building |
| L'Union Saint Jean-Baptist d' Amerique |
| Lutcher Memorial Church Building |
| Luzerne County Courthouse |
| Lylburn Downing School |
| Lynchburg Hospital |
| Lyndon Carnegie Library |
| Lynn County Courthouse |
| MacDonald, Flora, College |
| MacFarland House |
| MacFarland House |
| Machaven |
| MacIntyre Park and MacIntyre Park High School |
| Mackie, George K., House |
| MacLean Hall |
| Madden School |
| Madera County Courthouse |
| Madison Carnegie Library |
| Madison City Hall |
| Madison County Courthouse |
| Madison Gas and Electric Company Powerhouse |
| Madison, James, School |
| Madison Masonic Temple |
| Madison Masonic Temple |
| Madison Public Library |
| Madison Theatre |
| Madrid Building |
| Magee, J. D., House |
| Mahnomen County Courthouse |
| Main Building, Concordia College |
| Main Hall/La Crosse State Normal School |
| Main Hall, Lawrence University |
| Main Post Office and Federal Building |
| Main Street Post Office |
| Majors, Alexander, House |
| Mallory Hotel |
| Mamaroneck Methodist Church |
| Manatee County Courthouse |
| Maney-Sidway House |
| Mangum, Bartlett, House |
| Manhattan Carnegie Library Building |
| Mann, Horace, Elementary School |
| Mann, Horace, School |
| Manning Library |
| Manomet Mills |
| Manor, The |
| Mansfield Savings Bank |
| Manti Carnegie Library |
| Mantua Center School |
| Manufacturer's National Bank |
| Mapleton Public Library |
| Maquoketa Free Public Library |
| Marcouse Building |
| Margaret Hall |
| Marianna Waterworks |
| Marine Corps Supply Activity |
| Marine National Bank |
| Marion Carnegie Public Library |
| Marion County Courthouse |
| Marion County Courthouse |
| Marion House and Marion Brothers Store |
| Markle Banking & Trust Company Building |
| Mark Twain School |
| Marland Filling Station |
| Marlinton Opera House |
| Marlow Theatre |
| Marquette County Courthouse |
| Marquis Opera House |
| Marseilles Hydro Plant |
| Marsellis House |
| Marshall County Courthouse |
| Marshall Hotel |
| Marshall School |
| Marshall US Post Office |
| Martin, John A., Grade School |
| Marvin Memorial Library |
| Marwood Apartments |
| Marx-Hurlburt Building |
| Mary E. Wells School |
| Maryland Hotel |
| Marymont |
| Mason, Charles T., House |
| Mason City Public Library |
| Mason, George G., House |
| Mason Historic District |
| Mason-Hughes House |
| Masonic Building |
| Masonic Hall |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
Data from United States Park Service and Wikidata
