Ohio - Role: Building
| Martin Block and Kibby Block |
| Martin, Brooke and Anna E. House |
| Martindale, Samuel, House |
| Marting Hotel |
| Martin, Henry, Farm |
| Martin House |
| Martin, Joseph, House |
| Marvin Memorial Library |
| Marysville Light and Water Company Plant |
| Mason, Frank H., House |
| Mason House |
| Masonic Lodge #472 |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple Building |
| Masonic Temple Building |
| Masonic Temple Price Hill Lodge, No. 524 |
| Mason, James, House |
| Mason, John Wesley, Gothic Cottage |
| Massillon Cemetery Building |
| Mater Dei Chapel |
| Mathews House |
| Mattoon-Woodrow House |
| Maudru House |
| Maumee Theater |
| May Company |
| May, David and Mary, House |
| Mayer, S. C., House |
| Mayfield Theatre Building, The |
| May Realty Building |
| McBean, Daniel, Farmstead |
| McCafferty Run Farmstead |
| McCafferty, William, Farmhouse |
| McCarthy-Blosser-Dillon Building |
| McClelland, Harry S., House |
| McClure-Nesbitt Motor Company |
| McCook, Daniel, House |
| McCorkle, Almon G., House |
| McCormick Manufacturing Company Building |
| McCracken-McFarland House |
| McCracken-Scott House |
| McCracken-Sells House |
| McCrea, Matthew, House |
| McCreary-Burnworth House |
| McCrory Building |
| McCully Log House |
| McCune's Villa |
| McDannald Homestead |
| McDowell, Austin, House |
| McDowell, R.M. and Elizabeth, House |
| McFarland, Duncan, House |
| McFarland, James, House |
| McGraw House |
| McGuffey, William H., House |
| McKay, Moses, House |
| McKee-Pumphrey House |
| McKelvey-Higbee Co. Buildings |
| McKenster-Groff House |
| McKever, Lewis, Farmhouse |
| McKinley Memorial |
| McKinley Park Apartments |
| McKinley School |
| McKinley School |
| McKinley School |
| McKinley Terrace |
| McKinley, William, Tomb |
| McKisson, Robert, House |
| McKitrick, Dr., House |
| McKitrick, Dr., Office |
| McLain-Gillmer House |
| McMillan, Reuben, Free Library |
| McNamar-McLure-Miller Residence |
| McPherson, Maj. Gen. James B., House |
| McSweeney, John, House |
| McWilliams, Matthew, House |
| Mead House |
| Mead-Zimmerman House |
| Mechanics Building and Loan Company |
| Mechanicsburg Baptist Church |
| Mecklenburg's Garden |
| Medical Centre Building |
| Medill, William, House |
| Medina County Courthouse |
| Medina Farmers Exchange Co. |
| Medina Masonic Temple and Medina Theater |
| Meeker, Forrest, House and Farm |
| Meek, J.F., Buildings |
| Meigs County Fairgrounds, Grandstand and Racetrack |
| Meister Apartments, The |
| Melbourne Flats |
| Mellett-Canton Daily News Building |
| Melville-Milne, William Gordon, House |
| Memorial Hall |
| Memorial Hall |
| Mendon Town Hall |
| Mentor Village Hall |
| Mentor Village School |
Data from United States Park Service and Wikidata
