Oregon - Significance region: Local
| Lamson Ranch |
| Landenberger, C. A., House |
| Lane County Farmers' Union Cooperative Wholesalers' Association Building |
| Larson, Peter and Maria, House |
| Latourette, Charles David, House |
| Latourette, Charles, David, House |
| Latourette, DeWitt Clinton, House |
| Lauer Apartment Building |
| Laughlin, Lee, House |
| Laurelhurst Historic District |
| Laurelhurst Manor Apartments |
| Laurelhurst Park |
| Laurelwood Historic District |
| Lebanon Pioneer Cemetery |
| Lebanon Southern Pacific Railroad Depot |
| Lee, Dr. Norman L., House |
| Lee-Janouch House |
| Leinenweber, Christian, House |
| Lent, George P., Investment Properties |
| Leutgert, Henry C., Building |
| Lewisburg Hall and Warehouse Company Building |
| Lewis, C. Hunt and Gertrude McClintock, House |
| Lewis-Shippy House |
| Lewis, William H., Model House |
| Lewthwaite, Alexander and Cornelia, House |
| Lewthwaite-Moffatt House |
| Liberty Building |
| Liberty Theater |
| Liberty Theatre |
| Liebes, H. and Company, Building |
| Lindberg, Peter John, House |
| Lindquist Apartment House |
| Linklater, Zula, House |
| Linkville Pioneer Cemetery |
| Linnea Hall |
| Lipman-Wolfe and Company Building |
| Lippincott, William J. and Sarah Wagner, House |
| Lithia Springs Hotel |
| Livesley, T. A., House |
| Livingston, C.J., House |
| Lodgepole Guard Station |
| Loeb, Nathan, House |
| Logan Cut |
| Logan Drain Ditches |
| Logan Wash Ditch |
| Log Cabin Inn Ensemble |
| Lombard Automobile Buildings |
| Londershausen House |
| Londershausen House |
| Lone Fir Cemetery |
| Long, A. G., House |
| Look-Out on Cape Foulweather, The |
| Loomis, Robert and Mabel, House |
| Lostine Pharmacy |
| Louise Home Hospital and Residence Hall |
| Lowell Grange |
| Lucas, Robert and Ruth, House and Mary E. Rose House |
| 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, W. R., House |
| Macksburg Lutheran Church |
| MacMaster, William and Annie, House |
| Macpherson, Hector and Margaret, Barn |
| Macrum, Isaac, House |
| Madden-McCaskey House |
| Madras Army Air Field North Hanger |
| Malarkey, Herbert and Elizabeth, House |
| Mallory Avenue Christian Church |
| Mallory Hotel |
| Malmgren Garage |
| Mann, Anna Lewis, Old People's Home |
| Manning-Kamna Farm |
| Manning, S. A., Building |
| Marion County Housing Committee Demonstration House |
| Marion Forks Guard Station |
| Markle-Pittock House |
| Marquam Manor |
| Marshall, Dr. John D., Building |
| Marshall-Wells Company Warehouse No. 2 |
| Marshfield City Hall |
| Marshfield Elks Temple |
| Marshfield Hotel |
| Marshfield I.O.O.F. Cemetery |
| Marshfield Sun Printing Plant |
| Martin, George W. and Hannah,-John B. and Minnie Hosford House |
| Marx-Schaefers House |
| Masonic Temple |
| Masters, Andrew Jackson and Sarah Jane, House |
| Mathews, Nelson and Margret, House |
| Mathieson-Worthington House |
| Matlock-Brownfield Building |
| Mattey, Joseph, House |
| Maupin Section Foreman's House |
| Maurer, Joseph and Barbara, House |
| Maxwell, James O., Farmstead |
| McAvinney Fourplex |
Data from United States Park Service and Wikidata
