Indiana - Significance region: Local
| Meyer, Dr. John and Gerda, House |
| Meyer, Joseph Ernest, House |
| M. Fine & Sons Building |
| Miami County Courthouse |
| Michael, Enos, House |
| Michigan City Breakwater Light |
| Michigan City East Pierhead Light Tower and Elevated Walk |
| Michigan City Post Office |
| Middletown Bridge |
| Middletown Commercial Historic District |
| Milan Masonic Lodge No. 31 |
| Milford, Marshall M., House |
| Milisen, Dr. Robert L. and Ellen, House |
| Millen-Chase-McCalla House |
| Millen House |
| Miller, Arthur, House |
| Miller-Parrott Baking Company Building |
| Miller Town Hall |
| Millikan, Lovel D., House |
| Mishawaka Carnegie Library |
| Mishawaka Fire Station No. 4 |
| Mishawaka Reservoir Caretaker's Residence |
| Mitchell Downtown Historic District |
| Mitchell, Joseph, House |
| Mitchell Opera House |
| Mock School |
| Mohr, Louis, Block |
| Monon Commercial Historic District |
| Monon Park Dancing Pavillion |
| Monroe Carnegie Library |
| Monroe County Courthouse |
| Monroe Terrace Historic District |
| Mont Clair |
| Monteith, Mark L. and Harriet E., House |
| Montgomery, T. Harlan and Helen, House |
| Montgomery Ward Building |
| Monticello Carnegie Library |
| Montpelier Carnegie Library |
| Moore/Carlew Building |
| Moore's Hill United Methodist Church |
| Mooresville Commercial Historic District |
| Mooresville Gymnasium |
| Moore, Thomas, House |
| Moore-Youse-Maxon House |
| Morehouse, Levi and Lucy, Farm |
| Morehous Residential Historic District |
| Morey House |
| Morey-Lampert House |
| Morgan County Courthouse |
| Morgan County Sheriff's House and Jail |
| Morgan House |
| Morgan-Skinner-Boyd Homestead |
| Morgantown Historic District |
| Morningside Historic District |
| Morrison Block (M. O'Connor Grocery Wholesalers) |
| Morrison, Francis H., House |
| Morton School |
| Mount Pleasant Beech Church and Beech Cemetery |
| Mount Vernon Downtown Historic District |
| Mount Vernon Site |
| Mountz House |
| Mount Zion Methodist Episcopal Church |
| Mt. Pisgah Lutheran Church |
| Muessel-Drewry's Brewery |
| Muncie Public Library |
| Muncie Trade School |
| Murray Theater |
| Myrtle Fern |
| Nappanee West Park and Pavilion |
| Nappaness Eastside Historic District |
| Nashville Historic District |
| National City Bank |
| National Road over Deer Creek Historic District |
| Neely House |
| Nelson, F.P., House |
| Nester House |
| New Albany Downtown Historic District |
| New Albany-Floyd County Public Library |
| New Augusta Historic District |
| Newberry Friends Meeting House |
| Newby, Micah, House |
| New Carlisle Historic District |
| New Castle Commercial Historic District |
| New Goshen District No. 2 School |
| New Hope Bridge |
| Newkirk Mansion |
| Newman, M. G., Building |
| Newsom-Marr Farm |
| Newton County Courthouse |
| New York Central Railroad Passenger Depot |
| Nichols, Charles E., House |
| Nichols, J.L., House and Studio |
| Nicholson, Andrew, Farmstead |
| Nicholson-Rand House |
| Niewerth Building |
| Ninth Street Hill Neighborhood Historic District |
| Noble County Courthouse |
| Noblesville Commercial Historic District |
| Noblesville Milling Company Mill |
| Noftzger-Adams House |
Data from United States Park Service and Wikidata
