Oregon - Criteria: C (architecture/engineering)
| MacMaster, William and Annie, House |
| Macrum, Isaac, House |
| Maegly, A. H., House |
| Mallory Hotel |
| Mangels, William F., Four-Row Carousel |
| Mann, Anna Lewis, Old People's Home |
| Manning-Kamna Farm |
| Marion County Housing Committee Demonstration House |
| Marion Forks Guard Station |
| Markle-Pittock House |
| Marks, Morris, House |
| Marquam Manor |
| Marshfield Elks Temple |
| Masonic Cemetery and Hope Abbey Mausoleum |
| Masonic Temple |
| Maxwell, James O., Farmstead |
| McAvinney Fourplex |
| McCann, Thomas, House |
| McCarver, Morton Matthew, House |
| McCracken Brothers Motor Freight Building |
| 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 |
| McKenzie Highway Historic District |
| McLoughlin Promenade |
| McManus, Patrick F., House |
| McMinnville Downtown Historic District |
| McMorran and Washburne Department Store Building |
| Medford Carnegie Library |
| Medford Downtown Historic District |
| Medford IOOF Cemetery |
| Medford Southern Pacific Railroad Passenger Depot |
| Medical Arts Building |
| Meier and Frank Building |
| Meier and Frank Delivery Depot |
| Meier & Frank Warehouse |
| Memorial Coliseum |
| Menefee, L. B., House |
| Methodist Episcopal Church of Goshen |
| Methodist Episcopal Church South |
| Methodist Episcopal Church South |
| Michos, Thomas, House |
| Miller Cemetery Church |
| Miller, Claude Hayes, House |
| Miller, Elmer and Linnie, House |
| Miller, Fred O., House |
| Miller, Henry B., House |
| Miller's Mountain House |
| Mills, Lewis H., House |
| Milne, James, House |
| Milo Academy Bridge |
| Mizpah Presbytarian Church of East Portland |
| Mock, John, House |
| Mohawk Building |
| Mohle, Wilhelmina, House |
| Monahan House |
| Monastery of the Precious Blood |
| Monroe State Bank Building |
| Monteith,Thomas and Walter,House |
| Montgomery Ward & Company |
| Moody, Malcolm A., House |
| Mooers, Dr. Robert R. and Mary Helen, House |
| Moore, John and Helen, House |
| Moore, Robert D., House |
| Morgan Building |
| Morgan, Melinda E., House |
| Morrison Bridge |
| Morrow County Courthouse |
| Morse, Wayne, Farm |
| Mosby Creek Bridge |
| Mosier, Jefferson, House |
| Mosier Mounds Complex |
| Mount Hood Masonic Temple |
| Mount Tabor Park |
| Moyer, John M., House |
| Mt. Pleasant Presbyterian Church |
| Mt. Stella Lookout |
| Multnomah County Courthouse |
| Multnomah Falls Lodge and Footpath |
| Multnomah Hotel |
| Munsell, William O., House |
| Munson Valley Historic District |
| Murphy, Lester and Hazel, House |
| Murphy, Paul C., House |
| Murphy, Paul F., House |
| Musick Guard Station |
| Neighborhood House |
| Neighbors of Woodcraft Building |
| Nelson, Carl E., House |
| Nelson, Otto W. and Ida L., House |
| Neuberger, Isaac, House |
| Nevada-California-Oregon Railway Passenger Station |
| New Cliff House |
| New Fliedner Building |
| New Heathman Hotel |
| New Logus Block |
Data from United States Park Service and Wikidata
