Oregon - Criteria: C (architecture/engineering)
| IOOF Building |
| Irish Bend Covered Bridge No. 14169 |
| Irvington Bowman Apartments |
| Irvington Historic District |
| Irvington Tennis Club |
| Irwin, Richard S., Barn |
| Isom, Mary Frances, Cottage |
| Jackson County Courthouse |
| Jacobberger, Josef, House |
| Jacobs-Wilson House |
| Jantzen Knitting Mills Company Building |
| Jeanne Manor Apartment Building |
| Jefferson Methodist Church |
| Jefferson Substation |
| Jeffrey, Oliver and Margaret, House |
| Jenkins, Belle Ainsworth, Estate |
| Jensen Investment Company Building |
| Jeppesen, Peter, House |
| J. K. Gill Company Building |
| John Day Compound, Supervisor's Warehouse |
| Johnson, Charles E., Building |
| Johnson Hall |
| Jones, Clarence H., House |
| Jones-Sherman House |
| Jones, Simpson E., House |
| Jorgensen, Victor H. and Marta, House |
| Journal Building |
| Julian Hotel |
| Kamm, Jacob, House |
| Keck, H.C., House-Mt. Olivet Parsonage |
| Keller, Edward H. and Bertha R., House |
| Kelly, Joseph D. and Margaret, House |
| Kendall, Joseph, House |
| Kennedy, John D., Elementary School |
| Kenton Commercial Historic District |
| Kenton Hotel |
| Kern, Grace, House |
| Kerr, Albertina, Nursery |
| Kienlen-Harbeck Building |
| 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 |
| 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 |
| Kress Building |
| Krouse, Nettie, Fourplex |
| Kuehle, Henry, Investment Property |
| Ladd's Addition Historic District |
| La Grande Commercial Historic District |
| Lake County Round Sale Barn |
| Lake Creek Bridge |
| Lake of the Woods Ranger Station-Work Center |
| Lamonta Compound-Prineville Supervisor's Warehouse |
| Landenberger, C. A., House |
| Lane County Clerk's Building |
| Lane-Miles Standish Company Printing Plant |
| Larson, Peter and Maria, House |
| Larwood Bridge |
| Lauer Apartment Building |
| Laurelhurst Historic District |
| Laurelhurst Manor Apartments |
| Laurelhurst Park |
| Lebanon Pioneer Cemetery |
| Lebanon Southern Pacific Railroad Depot |
| Leinenweber, Christian, House |
| Lent, George P., Investment Properties |
| Leutgert, Henry C., Building |
| Lewis, William H., Model House |
| Liberty Theater |
| Lick Creek Guard Station |
| Liebes, H. and Company, Building |
| Lightship WAL-604, COLUMBIA |
| Lindquist Apartment House |
| Linklater, Zula, House |
| Linnea Hall |
| Lipman-Wolfe and Company Building |
| Lithia Park |
| Lithia Springs Hotel |
| Livesley, T. A., House |
| Loeb, Nathan, House |
| Londershausen House |
| Long, A. G., House |
| Loomis, Robert and Mabel, House |
| Lost Creek Bridge |
| Lowell Bridge |
| Lueddemann, Max and Ollie, House |
| Lumbermen's Building |
| Lynch, Matthew J. and Florence, House and Garden |
| Lytle, Robert F., House |
| Mackenzie, Dr. K. A. J. and Cora, House |
| Macksburg Lutheran Church |
Data from United States Park Service and Wikidata
