Oregon - Area of significance: Architecture
| Lueddemann, Max and Ollie, House |
| Lumbermen's Building |
| Lundburg, George H., House |
| Lynch, Matthew J. and Florence, House and Garden |
| Lytle, Robert F., House |
| Mabee-Mayberry House |
| Mackenzie, Dr. K. A. J. and Cora, House |
| Mackenzie, W. R., House |
| Macksburg Lutheran Church |
| MacMaster, William and Annie, House |
| Macpherson, Hector and Margaret, Barn |
| Macrum, Isaac, House |
| Madras Army Air Field North Hanger |
| Maegly, A. H., House |
| Mallory Avenue Christian Church |
| Mallory Hotel |
| Malmgren Garage |
| 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 |
| Marshall-Wells Company Warehouse No. 2 |
| Marshfield City Hall |
| Marshfield Elks Temple |
| Marshfield Hotel |
| Martin, George W. and Hannah,-John B. and Minnie Hosford House |
| Marx-Schaefers House |
| Masonic Cemetery and Hope Abbey Mausoleum |
| Masonic Temple |
| Mathews, Nelson and Margret, House |
| Mathieson-Worthington House |
| Matlock-Brownfield Building |
| Mattey, Joseph, House |
| Maurer, Joseph and Barbara, House |
| Maxwell, James O., Farmstead |
| McAvinney Fourplex |
| McCallister-Gash Farmhouse |
| McCall, John, House |
| McCann, Thomas, House |
| McCarver, Morton Matthew, House |
| 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 |
| McLean, Dr. Edward and Anne, House |
| McLean, Robert and Lucy, House |
| McManus, Patrick F., House |
| McMinnville Downtown Historic District |
| McMorran and Washburne Department Store Building |
| McNish House |
| Meacham Hotel |
| Medford Carnegie Library |
| Medford Downtown Historic District |
| Medford Geneva-Minnesota Historic District |
| Medford Grocery Company Warehouse |
| 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 |
| Memorial Coliseum |
| Menefee, L. B., 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 |
| Michos, Thomas, House |
| Milarkey Building |
| Milde, Gottlieb and Della, Barn |
| Miller Cemetery Church |
| Miller, Claude Hayes, House |
| Miller, Elmer and Linnie, House |
| Miller, Fred O., House |
| Miller, Henry B., House |
| Miller's Mountain House |
| Mill-Pine Neighborhood Historic District |
| Mills, Lewis H., House |
| Mills, Warren, House |
| Milne, James, House |
| Mingus Park Community Building |
| Minto, John and Douglas, Houses |
| Mizpah Presbytarian Church of East Portland |
| Mock, John, House |
| Mohawk Building |
| Mohle, Wilhelmina, House |
| Monahan House |
| Monastery of the Precious Blood |
Data from United States Park Service and Wikidata
