All - Architectural style - Romanesque Revival architecture
| Levy Brothers Building |
| Lewiston Methodist Church |
| Library Hall |
| Lincoln Building |
| Lindauer and Rupert Block |
| Linden Methodist Church |
| Link, Oliver L. and Catherine, House |
| Lisbon Falls High School |
| Lisbon Opera House |
| Lithgow Library |
| Livingston County Courthouse and Clerk's Offices |
| Llano County Courthouse and Jail |
| Loretto Heights Academy |
| Loth, Joseph, Company Building |
| Louisville City Hall Complex |
| Lowell Post Office |
| Lucas County Courthouse |
| Luce County Sheriff's House and Jail |
| Lumber Exchange Building |
| Luverne Carnegie Library |
| Luzon Apartment Building |
| Lynn, Armory |
| Macedonia African Methodist Episcopal Church |
| Machinery Row |
| Macon County Courthouse |
| Macon County Courthouse |
| Macon County Courthouse and Annex |
| Madison County Courthouse |
| Madison Elementary School |
| Madison Public Library and the James Building |
| Madison Seminary And Home |
| Mahaska County Courthouse |
| Main Building of Dixie College |
| Maine Central Railroad General Office Building |
| Maine Eye and Ear Infirmary |
| Main, North Dakota School of Forestry, Old |
| Main Street Methodist Episcopal Church South |
| Mankato Public Library and Reading Room |
| Maple Grove Cemetery |
| Maplewood Hotel |
| Marble Collegiate Reformed Church |
| Maria Angelorum Chapel |
| Marion County Courthouse |
| Marion County Courthouse |
| Martinsville High School Gymnasium |
| Masonic Opera House |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple and Scottish Rite Cathedral |
| Masonic Temple Building |
| Masonic Temple Building |
| Masonic Temple Building |
| Mason School |
| Massillon Cemetery Building |
| Mausert Block |
| Maverick-Carter House |
| McCabe Building |
| McCammon State Bank Building |
| McClenathan, J.C., Dr., House and Office |
| McCormick School |
| McCulloch County Courthouse |
| McDowell County Courthouse |
| McEchron, William, House |
| McHugh-Andrews House |
| McKeesport National Bank |
| McKinley School |
| McLeod and Smith Inc. Headquarters |
| Meetinghouse of the Central Congregational Church |
| Mercantile Trust and Deposit Company |
| Mercer County Courthouse |
| Merchants and Farmers Bank Building |
| Merchants Bank of Ellis |
| Merchants National Bank |
| Merrill City Hall |
| Methodist Episcopal Church |
| Methodist Episcopal Church |
| Methodist Episcopal Church |
| Methodist Episcopal Church |
| Methodist Episcopal Church of Montrose |
| Metropolitan Block |
| Metropolitan Opera House |
| Meyer and Raapke |
| Miami County Courthouse |
| Michigan Central Depot |
| Michigan Trust Company Building |
| Middlesex Center Methodist Church |
| Milan Masonic Lodge No. 31 |
| Milbank, Brinckerhoff, and Fiske Halls |
| Milford Congregational Church |
| Miller Block |
| Millicent Library |
| Millington Bank Building |
| Mills, Job, Block |
| Mineral County Courthouse |
| Minto School |
| Missouri Electric Light and Power Co. |
| Missouri/Sedalia Trust Company |
| Mitchell Building-First State Bank Building |
| Moeszinger-Marquis Hardware Co. |
| Mohr, Louis, Block |
Data from United States Park Service and Wikidata
