Oregon - Role: Building
| Klamath County Armory & Auditorium |
| Klamath Falls City Hall |
| Klamath Falls City Library, Old |
| Kline, Lewis G., Building |
| Kline, Lewis G., House |
| Kline, Moses, and Ida, House |
| Knight, F. M., Building |
| Knight, William, House |
| Kohlhagen Building |
| Koontz, James H. and Cynthia, House |
| Koontz, J.H., Building |
| Koski Building |
| Kraft-Brandes-Culberston Farmstead |
| Kress Building |
| Krietz House |
| Krouse, Nettie, Fourplex |
| Kuehle, Henry, Investment Property |
| Kyle, William, and Sons, Building |
| Ladd Carriage House |
| Ladd Estate Company Model House |
| LaDow Block |
| La Grande Neighborhood Club |
| Lake County Round Sale Barn |
| Lake of the Woods Ranger Station-Work Center |
| Lake Oswego Hunt Club Ensemble |
| Lake Oswego Odd Fellows Hall |
| Lamonta Compound-Prineville Supervisor's Warehouse |
| Lamport, Frederick S., House |
| Lamson Ranch |
| Landenberger, C. A., House |
| Lane County Clerk's Building |
| Lane County Farmers' Union Cooperative Wholesalers' Association Building |
| Lane-Miles Standish Company Printing Plant |
| Larson, Peter and Maria, House |
| Latourette, Charles David, House |
| Latourette, Charles, David, House |
| Latourette, DeWitt Clinton, House |
| Lauer Apartment Building |
| Laughlin, Lee, House |
| Laurelhurst Manor Apartments |
| Lebanon Southern Pacific Railroad Depot |
| Lee, Dr. Norman L., House |
| Lee-Janouch House |
| Lee, Jason, 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 |
| Lick Creek Guard Station |
| Liebes, H. and Company, Building |
| Lindberg, Peter John, House |
| Lindquist Apartment House |
| Linklater, Zula, House |
| 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 |
| Log Cabin Inn Ensemble |
| Lombard Automobile Buildings |
| Londershausen House |
| Londershausen House |
| 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, 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 |
| Madden-McCaskey House |
| Madras Army Air Field North Hanger |
| Maegly, A. H., House |
| Malarkey, Daniel J., House |
| Malarkey, Herbert and Elizabeth, House |
| Mallory Avenue Christian Church |
| Mallory Hotel |
| Malmgren Garage |
Data from United States Park Service and Wikidata
