All - Architectural style - Neoclassical architecture
| Kansas City Athenaeum |
| Kansas City, Kansas City Hall and Fire Headquarters |
| Kansas City Masonic Temple |
| Kappa Sigma Fraternity, Gamma Theta Chapter |
| Karcher-Sahr House |
| Kaufman, E. C., House |
| Kearney County Courthouse |
| Keerl-Decker House |
| Kellerman Motor Car Company |
| Kelley, John S., House |
| Kell, Frank, House |
| Kellogg Public Library and Neville Public Museum |
| Kelly, George H., House |
| Kelsey Temple Church of God in Christ |
| Kemp & Hebert Building |
| Kendel Building |
| Keneseth Israel Synagogue |
| Kenilworth Elementary School |
| Kenmil Place |
| Kennedy Street School |
| Kenosha County Courthouse and Jail |
| Kenridge |
| Kent, Jerry, House |
| Kenton County Library |
| Kenwood |
| Keokuk County Courthouse |
| Kern, Grace, House |
| Kewanee Hotel |
| Kewanee Public Library |
| Key, Francis Scott, Bridge |
| Kibler High School |
| Kilbourn Masonic Temple |
| Kilkoff House |
| Kimball County Courthouse |
| Kingfisher Memorial Hall |
| Kingman Carnegie Library |
| Kings County Courthouse |
| Kings Daughters Public Library |
| Kingston Armory |
| Kingston City Library |
| Kinnard, Claiborne, House |
| Kintner-Withers House |
| Kirby Road School |
| Kirklin Public Library |
| Kirstein Building |
| Kiser Mansion |
| Kisner, Robert R. and Minnie L., House |
| Kleberg County Courthouse |
| Knickerbocker Hotel |
| Knight-Allen House |
| Knights of Pythias Lodge |
| Knights of Pythias Pavilion |
| Knox Mansion |
| Knoxville Veterans Administration Hospital Historic District |
| Koochiching County Courthouse |
| Koren Library |
| Koshland House |
| Kraft, Herbert, Memorial Free Library |
| Kress Building (S.H. Kress & Company Store) |
| Kurth, J. H., House |
| Lackawanna |
| Ladies of the Maccabees Building |
| Ladora Savings Bank |
| Lafayette Cemetery No. 1 |
| Lafayette County Courthouse |
| Lafayette County Courthouse |
| La Giralda |
| Lagonda National Bank |
| Lake City Community Memorial Building |
| Lake City Public Library |
| Lake County Courthouse |
| Lake Drive Apartments |
| Lakeport Carnegie Library |
| Lake Shore Bank and Cleveland Public Library St. Clair Branch |
| Lake Zumbro Hydroelectric Generating Plant |
| Lamar County Courthouse |
| Lamar County Hospital |
| Lamar Hotel |
| Lambeth Inn |
| Lamb's Club |
| Lamoine Hotel |
| Lancaster County Courthouse |
| Landergin-Harrington House |
| Lander-Hopkins House |
| Landry Tomb |
| Land Title Building |
| Langlade County Courthouse |
| Lanius, C. A., House |
| Lanning, T., & Co. Department Store |
| Laredo US Post Office, Court House and Custom House |
| Larimer Memorial Library |
| Larsen, Christen, House |
| LaSalle Hotel |
| LaSalle Theater Building |
| Lassen County Court House |
| Lassen, Henry, House |
| Latimer, William and Etta, House |
| Lauerman Brothers Department Store |
| Laurel Hall |
| Lava High School Gymnasium |
Data from United States Park Service and Wikidata
