All - Architectural style - Colonial Revival architecture
| Lebanon Woolen Mills |
| Ledbetter, James Dexter, House |
| Lee, Addison W., House |
| Lee, Agnes, Chapter House of the United Daughters of the Confederacy |
| Lee County Courthouse |
| Lee, Harry Fitzhugh, House |
| Lee, Malcolm K., House |
| Lee, Robert E., High School |
| Leesburg High School |
| Lee's Summit Christian Church Building |
| Leidy, Dr. Joseph, House |
| Leighton, Adam P., House |
| Leiper-Scott House |
| Le Mars Central High School |
| Lenox High School |
| Leslie-Alford-Mims House |
| Leuda-May Historic District |
| Leuthold, Jacob, Jr., House |
| Levenson, Morris, Three-Decker |
| Levine, Louis, House |
| Lewelling, Governor L.D., House |
| Lewis-Card-Perry House |
| Lewis, Charles D., House |
| Lewis, Harry and Molly, House |
| Lewis House |
| Lewis Mountain |
| Lewiston Public Library |
| Lewistown Armory |
| Lewis, Woodson, House |
| Library and Laboratory Building-Henderson Institute |
| Library-University of Illinois at Urbana-Champaign |
| Lichtenstein, S. Julius, House |
| Lightle House |
| Lilly, Edward S. and Mary Annatoile Albert, House |
| Lincliff |
| Lincoln Army Air Field Regimental Chapel |
| Lincoln Creek Day School |
| Lincoln School |
| Lincoln School |
| Lincolnshire, The |
| Lincoln YWCA Building |
| Linden |
| Lindenburg, Emil, House |
| Linden Terrace |
| Linekona School |
| Linwood Colonial Apartments |
| Lits Department Store |
| Little Rock Boys Club |
| Livingston, Dr. David S., House |
| Lodge |
| Loetscher, T. Ben, House |
| Long, A. G., House |
| Long, Edgar A., Building |
| Longfellow School |
| Long, George Parker, House |
| Longwood |
| Lorain Fire Station No. 1 |
| Lord, Addison, House |
| Lord, Capt. Enoch, House |
| Lord Culpeper Hotel |
| Lord, Richard T. C., and William V. Wilcox House |
| Loretta |
| Loretto Academy |
| Loring, Dr. David J., Residence and Clinic |
| Louden, R. Bruce and May W., House |
| Louden, R.R., and Antoinette, House |
| Louise Apartments |
| Louise Home Hospital and Residence Hall |
| Louttit Laundry |
| Lovejoy, Charles, House |
| Lovell, Capt. George, House |
| Lovingston High School |
| Lowe, Cicero Francis, House |
| Lowell, The |
| Low House |
| Lowry, Fayette C., House |
| Lowville Masonic Temple |
| Lucas County Hospital and Nurse's Home |
| Lucerne Inn |
| Lucketts School |
| Lundberg, Charles, House |
| Lutz Elementary School, Old |
| Lyman, Levi and Netti, House |
| Lynchburg Hospital |
| Lynch, Matthew J. and Florence, House and Garden |
| Lyne, Walter C., House |
| Lyons, Joseph D., House |
| Lyons Township Hall |
| Lyons Woman's Club House |
| Machaven |
| Madison Hotel |
| Madison Parish Courthouse |
| Madisonville Public Library |
| Magnuson, Charles, Three-Decker |
| Maine Central School |
| Maine Historical Society |
| Maine Industrial School for Girls Historic District |
| Maine Publicity Bureau Building |
| Main School |
| Malarkey, Herbert and Elizabeth, House |
Data from United States Park Service and Wikidata
