Indiana - Criteria: A (event)
| Makepeace, George, House |
| Manche, Maurice W., Farmstead |
| Mansfield Bridge |
| Mansfield Roller Mill |
| Mansion Row Historic District |
| Maple Grove Road Rural Historic District |
| Maplelawn Farmstead |
| Marble Creek Bridge |
| Marcy Village Apartments |
| Maring, Grace Keiser, Library |
| Marion County Bridge 0501F |
| Marion Downtown Commercial Historic District |
| Marion PCC & St. Louis Railroad Depot |
| Markle House and Mill Site |
| Marktown Historic District |
| Marott Hotel |
| Marquette School |
| Marr, James, House and Farm |
| Marshall Bridge |
| Marshall County Infirmary |
| Marshall, Thomas R., School |
| Mars Theatre |
| Martens |
| Martin County Courthouse |
| Martinsville Commercial Historic District |
| Martinsville High School Gymnasium |
| Martinsville Northside Historic District |
| Martinsville Sanitarium |
| Martinsville Vandalia Depot |
| Masonic Temple |
| Massachusetts |
| Massachusetts Avenue Commercial District |
| Matthews Stone Company Historic District |
| Mayfield, Leroy, House |
| Mayleeno |
| McAllister Bridge |
| McCall Family Farmstead |
| McCallum, William, House |
| McCormick Cabin Site |
| McCormick, Charles, Building |
| McCormick's Creek State Park Entrance and Gatehouse |
| McCulloch, Hugh, House |
| McCurdy Building (Sears, Roebuck and Company Building) |
| McHaffie, Melville F., Farm |
| McJohnston Chapel and Cemetery |
| McKay |
| McKim Observatory, DePauw University |
| McKinley School |
| Mead Johnson River-Rail-Truck Terminal and Warehouse |
| Mecca Bridge |
| Medora Covered Bridge |
| Meeks Avenue Historic District |
| Melcher Bridge |
| Melodeon Hall |
| Merchants National Bank and Annex |
| Meshingomesia (Mihsiinkweemisa) Cemetery and Indian School Historic District |
| Metamora Historic District |
| Miami County Courthouse |
| Michigan City Breakwater Light |
| Michigan City East Pierhead Light Tower and Elevated Walk |
| Michigan City Lighthouse |
| Michigan Road Toll House |
| Middletown Bridge |
| Middletown Commercial Historic District |
| Milan Masonic Lodge No. 31 |
| Military Park |
| Mill Creek Bridge |
| Millen House |
| Miller Town Hall |
| Minnetrista Boulevard Historic District |
| Mishawaka Carnegie Library |
| Mishawaka Fire Station No. 4 |
| Mishawaka Reservoir Caretaker's Residence |
| Mitchell Downtown Historic District |
| Mitchell Opera House |
| Mock School |
| Monon Commercial Historic District |
| Monon Park Dancing Pavillion |
| Monroe Terrace Historic District |
| Mont Clair |
| Montgomery County Jail and Sheriff's Residence |
| Montgomery Ward Building |
| Monticello Carnegie Library |
| Montpelier Carnegie Library |
| Mooresville Commercial Historic District |
| Mooresville Friends Academy Building |
| Mooresville Gymnasium |
| Moore, Thomas, House |
| Morehous Residential Historic District |
| Morgan County Courthouse |
| Morgan County Sheriff's House and Jail |
| Morgantown Historic District |
| Morningside Historic District |
| Morrison Block (M. O'Connor Grocery Wholesalers) |
| Morton School |
| Mount Vernon Downtown Historic District |
| Mount Zion Methodist Episcopal Church |
| Muessel-Drewry's Brewery |
| Muncie Public Library |
| Murray Theater |
Data from United States Park Service and Wikidata
