Oregon - Significance region: Local
| McCallister-Gash Farmhouse |
| McCann, Thomas, House |
| McCoin, Julius and Sarah, Homestead |
| McCracken Brothers Motor Freight Building |
| McCredie, William, House |
| McCully, David, House |
| McDonald, Daniel C. and Katie A., House |
| McDonald, Malcolm, House |
| McDonald Theater Building |
| McDougall, Alexander D., House |
| McDougall-Campbell House |
| McDougall, Natt and Christena, House |
| McGraw, Donald and Ruth, House |
| McKee Bridge Campground |
| McLean, Dr. Edward and Anne, House |
| McLean, Robert and Lucy, House |
| McLoughlin Promenade |
| McMinnville Downtown Historic District |
| McMorran and Washburne Department Store Building |
| McNamar Building |
| McNish House |
| Meacham Hotel |
| Medford Carnegie Library |
| Medford Central Firehall |
| Medford Downtown Historic District |
| Medford Geneva-Minnesota Historic District |
| Medford Grocery Company Warehouse |
| Medford IOOF Cemetery |
| Medford Plaza Apartments |
| Medford Southern Pacific Railroad Passenger Depot |
| Medical Arts Building |
| Meier and Frank Building |
| Meier and Frank Delivery Depot |
| Meier & Frank Warehouse |
| Mellinger House |
| Mellinger-Ponnay House |
| Merritt, John W., House and Store |
| Mertz, C.W., Rental House #2 |
| Methodist Episcopal Church of Goshen |
| Methodist Episcopal Church South |
| Methodist Episcopal Church South |
| Methodist Episcopal Parsonage |
| Michos, Thomas, House |
| Middle Ditch |
| Milarkey Building |
| Milde, Gottlieb and Della, Barn |
| Miller Cemetery Church |
| Miller, Claude Hayes, House |
| Miller, Elmer and Linnie, House |
| Miller, Fred O., House |
| Miller's Mountain House |
| Mill-Pine Neighborhood Historic District |
| Mills, Lewis H., House |
| Mills, Warren, House |
| Milne, James, House |
| Mingus Park Community Building |
| Minthorn Hall |
| Minto, John and Douglas, Houses |
| Mizpah Presbytarian Church of East Portland |
| Mock, John, House |
| Moeck, George F., House |
| Mohawk Building |
| Mohle, Wilhelmina, House |
| Monahan House |
| Monastery of the Precious Blood |
| Monroe State Bank Building |
| Monteith Historic District |
| Montgomery Ward & Company |
| Moody, Malcolm A., House |
| Mooers, Dr. Robert R. and Mary Helen, House |
| Moore, John and Helen, House |
| Moore, John and Mary, House |
| Moore, Robert D., House |
| Morgan Building |
| Morgan, Melinda E., House |
| Morrow County Courthouse |
| Morse House |
| Morse House |
| Morse, Wayne, Farm |
| Moser, Joseph Henry, Barn |
| Mosier, Jefferson, House |
| Mountain House |
| Mountain View Cemetery |
| Mount Hood Masonic Temple |
| Mount Tabor Park |
| Mount Tabor Park Reservoirs Historic District |
| Moyer, C. E., Nurseries Property |
| Moyer, John M., House |
| Mt. Hood Hotel Annex |
| Mt. Hood School House |
| Mt. Olivet Baptist Church |
| Mt. Pleasant Presbyterian Church |
| Mt. Stella Lookout |
| Multnomah County Courthouse |
| Multnomah Hotel |
| Multnomah School |
| Munsell, William O., House |
| Murphy, Lester and Hazel, House |
| Murphy, Paul F., House |
| Musick Guard Station |
Data from United States Park Service and Wikidata
