All - Constructed - 1910–1919
| Hygieostatic Bat Roost |
| Idaho Falls Public Library |
| Ilfeld, Charles, Memorial Chapel |
| Ilfeld Warehouse |
| Illinois Central Railroad Depot |
| Immaculate Conception Church and School |
| Immaculate Heart of Mary Catholic Church |
| Imperial Hotel |
| Imperial Hotel |
| Indiana Harbor Public Library |
| Indian and the Puritan |
| Indian Canyon Ranger Station |
| Indian Henry's Patrol Cabin |
| Indian Statue |
| Ingomar Public School |
| Interior Department Offices |
| Ironton City Hall |
| Irvine Blacksmith Shop |
| Island Woolen Company Office Building |
| Item Building |
| Ivernia Apartment Building |
| Ivy Burne |
| Jackman Building |
| Jack's Creek Covered Bridge |
| Jackson Building |
| Jackson Shore Apartments |
| Jacob Riis Park Historic District |
| Jacobson, Hyrum and Selma Erickson, House |
| Jacobson, Oscar B., House |
| Janson, Charles G., Garage |
| Jastro Building |
| J.C. Penney Company Building |
| Jeffries Ford Bridge |
| Jenkins Farmhouse |
| Jensen, Tollef, House |
| Jessup's Mill |
| Jesup Memorial Library |
| Johnson, Charles, House |
| Johnson Home |
| John Winthrop Chambers, The |
| Jonas, Charles R., Federal Building |
| Jonesboro Grange #357 |
| Jonesboro U.S. Post Office and Courthouse |
| Jones Brothers Mule Barn |
| Jones, David H., House |
| Journal Building |
| Joyner Building |
| Judson, The |
| Jukola Boardinghouse |
| Jump River Town Hall |
| Kahn's Department Store |
| Kajer, Wencl, Farmstead |
| Kalispell Monumental Company |
| Kansas City Athenaeum |
| Kansas City, Kansas City Hall and Fire Headquarters |
| Kansas City Southern Depot |
| Kansas City Southern Depot, Zwolle |
| Kansas City Southern Railway Building |
| Kant Hotel |
| Kappa Sigma Fraternity, Gamma Theta Chapter |
| Karamu House |
| Karnofsky Tailor Shop-House |
| Kasson Municipal Building |
| KATAHDIN (Lake Boat) |
| KATHERINE M. LEE (Schooner) |
| KCS Railway Depot |
| Kelley, James, House |
| Kell House |
| Kendrick Lookout Cabin |
| Kenilworth Inn |
| Kennedy, John D., Elementary School |
| Kennesaw Mountain National Battlefield Park |
| Keokuk Young Women's Christian Association Building |
| Kessler, William F., House |
| Ketchum, Billy, House |
| Kettering, Charles F., House |
| Keweenaw Waterway Lower Entrance Light |
| Kilbourn Masonic Temple |
| Kilbourn Public Library |
| Kilby House |
| King, Henrietta M., High School |
| Kington, W. W., House |
| Kinsley Civil War Monument |
| Kirk, Sennett and Bertha, House |
| Kirwin City Hall |
| Kitchi Gammi Club |
| Kittleson House |
| Klamath Falls City Hall |
| Kliegle Garage |
| Knearl School |
| Knesseth Israel Synagogue |
| Knight Grain Elevator |
| Knudson Brothers Building |
| Kohl Mansion |
| Kotani-En Garden |
| Krenz-Kerley Trading Post |
| Kunkel Building |
| La Blanche Apartments |
| Labo Del Rio Bridge |
| Lacombe School |
Data from United States Park Service and Wikidata
