Oregon - Area of significance: Architecture
| Johnson Hall |
| Johnston, Andrew J. and Anna B., Farmstead |
| Jones, Clarence H., House |
| Jones-Sherman House |
| Jones, Simpson E., House |
| Jorgensen, Victor H. and Marta, House |
| Journal Building |
| Julian Hotel |
| Kamm, Jacob, House |
| Kane, E. C., House |
| Kay, Thomas, Woolen Mill |
| Keating, John A. and Hattie Mae, House |
| Keck, H.C., House-Mt. Olivet Parsonage |
| Keller, Edward H. and Bertha R., House |
| Kelty, James M. and Paul R., House |
| Kendall, Joseph, House |
| Kennedy, John D., Elementary School |
| Kenton Commercial Historic District |
| Kenton Hotel |
| Kern, Grace, House |
| Kerr, Albertina, Nursery |
| Kershaw, Dr. Andrew, House |
| Kienlen-Harbeck Building |
| Kiernan House |
| King, Charles, House |
| King, Isaac, House and Barn |
| King, Samuel W., House |
| King's Hill Historic District |
| Kingsley, Edward D., House |
| Kinsman, John and Elizabeth, House |
| Kirkland Lookout Ground House (Guard Station) |
| Kistner, Dr. Frank B., House |
| Klamath County Armory & Auditorium |
| Kline, Lewis G., Building |
| Kline, Lewis G., House |
| Kline, Moses, and Ida, House |
| Knight, F. M., Building |
| Kohlhagen Building |
| Koontz, James H. and Cynthia, House |
| Kraft-Brandes-Culberston Farmstead |
| Kress Building |
| Krietz House |
| Krouse, Nettie, Fourplex |
| Kuehle, Henry, Investment Property |
| Kyle, William, and Sons, Building |
| Ladd Estate Company Model House |
| Ladd's Addition Historic District |
| LaDow Block |
| La Grande Commercial Historic District |
| Lake County Round Sale Barn |
| Lake of the Woods Ranger Station-Work Center |
| Lamonta Compound-Prineville Supervisor's Warehouse |
| Lamport, Frederick S., House |
| Lamson Ranch |
| Landenberger, C. A., House |
| Lane County Clerk's 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 Historic District |
| Laurelhurst Manor Apartments |
| Laurelwood Historic District |
| Leaburg Hydroelectric Project Historic District |
| 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 |
| 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 |
| Lightship WAL-604, COLUMBIA |
| 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 |
| Londershausen House |
| Long, A. G., House |
| Loomis, Robert and Mabel, House |
| Lucas, Robert and Ruth, House and Mary E. Rose House |
Data from United States Park Service and Wikidata
