Washington - Role: Building
| Kirkman House |
| Kirk, Peter, Building |
| Klager, Hulda, Lilac Gardens |
| Klickitat County Courthouse |
| Klipsan Beach Life Saving Station |
| Knickerbocker |
| Knight House |
| Knights of Columbus Hall - Council No. 676 |
| Knuppenburg, James, House |
| Koerner House |
| Koma Kulshan Ranger Station |
| Kraus, Joseph, House |
| Kristoferson Dairy |
| Lackamas School |
| LaFramboise Farmstead |
| Lake George Patrol Cabin |
| Lake-Little House |
| Lake Quinault Lodge |
| Lakeview School |
| Lake Wenatchee Residence No. 1200 |
| Lambert School |
| Lancaster, Judge Columbia, House |
| Landes, Colonel Henry, House |
| Larrabee House |
| Larson, A. E., Building |
| Larson-Hellieson House |
| Larson, Lewis P., House |
| Latah School |
| Laubach, J. N., House |
| Laughlin Round Barn |
| La Wis Wis Guard Station No. 1165 |
| Leader Building |
| Leamington Hotel and Apartments |
| Leary, Eliza Ferry, House |
| Leavenworth Ranger Station |
| Leonard, T. A., Barn |
| Leopold Hotel |
| Lester Depot |
| Levesque-Majer House |
| Lewis & Clark High School |
| Lewis County Courthouse |
| Lewis, Hannah, House |
| Liberty Theater |
| Liggett Building |
| Lincoln Hotel |
| Lincoln School |
| Lincoln Theater and Commercial Block |
| Lindsey, William, House |
| Littlebrook |
| Little Red Schoolhouse |
| Loers, Benjamin, House |
| Longbranch School Gymnasium |
| Longfellow Elementary School |
| Long Lake Recreation Hall |
| Longmire Buildings |
| Longmire Campground Comfort Station No. L-302 |
| Longmire Campground Comfort Station No. L-303 |
| Longmire Campground Comfort Station No. L-304 |
| Long, Robert Alexander, High School |
| Longview Community Church |
| Longview Community Church-Saint Helen's Addition |
| Longview Community Store |
| Longview Women's Clubhouse |
| Loomis House |
| Loon Lake School |
| Lord, C. J., Mansion |
| Lord-Heuston House |
| Lord, Richard Hinton, House |
| Lost Lake Guard Station |
| Lotz, J. H., House |
| Lowe, David, House |
| Lucas Homestead |
| Lucerne Guard Station |
| Ludwigs, George, House |
| Luepke Florist |
| Lumber Exchange Building |
| Lund Building |
| Lutheran St. Paul's Kirche |
| Lynden Department Store |
| Lynn, C.O., Co. Funeral Home |
| Lyon Building |
| Lytle, Joseph, Home |
| Mabton High School |
| Magnolia Public Library |
| Malaney-O'Neill House |
| Maloney's General Store |
| Manley-Thompson Ford Agency |
| Manresa Hall |
| Marcus Whitman Hotel |
| Marine Supply and Hardware Complex |
| Marsh, Louis S., House |
| Maryhill |
| Mary Queen of Heaven Roman Catholic Church |
| Marysville Opera House |
| Mason County Courthouse |
| Masonic Hall |
| Masonic Hall- Port Orchard |
| Masonic Lodge Building |
| Masonic Temple |
| Masonic Temple |
Data from United States Park Service and Wikidata
