Indiana - Role: Building
| Lauter, H., Company Complex |
| Lawton, Chauncey N., House |
| Learner Building |
| Leedy, Bert, Round Barn |
| Leeper, Samuel, Jr., House |
| Legg House |
| Lehmback, Charles, Farmstead |
| Leich, Charles, and Company |
| Leive, Parks and Stapp Opera House |
| Leland Hotel |
| Lemmon's Church and Cemetery |
| Lenhart Farmhouse |
| Lentz House (Hotel Sheller) |
| Lerner Theatre |
| Levey, Louis, Mansion |
| Lewis, Thomas J., House |
| Liberty Baptist Church |
| Liberty Township Schoolhouse No. 2 |
| Lieber, Richard, Log Cabin |
| Lilly Biological Laboratories |
| Lincoln Park School |
| Linden Depot |
| Lindley, Thomas Elwood, House |
| Linton Public Library |
| Linton Township High School and Community Building |
| Little Cedar Grove Baptist Church |
| Little Crow Milling Company Factory |
| Littleton, Frank, Round Barn |
| Lockefield Garden Apartments |
| Lockyear College |
| Lodge |
| Log Cabin Inn Tourist Camp |
| Lombard Building |
| Long Schoolhouse |
| Lords, William L., House |
| Loring, Dr. David J., Residence and Clinic |
| Lowell Heights-Olivet African Methodist Episcopal Church |
| Lowry, William, House |
| Luckey Hospital |
| Luick, William Henry, Farmhouse |
| Lyles Consolidated School |
| Lynd School |
| Maack, Albert, House |
| Madden School |
| Maier, Peter Augustus, House |
| Majestic Building |
| Major, Daniel S., House |
| Makepeace, George, House |
| Mallon Building |
| Manchester Apartments |
| Mansfield Roller Mill |
| Marian Apartments |
| Maring, Grace Keiser, Library |
| Marion Firestone Auto Supply & Service Center |
| Marion PCC & St. Louis Railroad Depot |
| Markle House and Mill Site |
| Marott Hotel |
| Marott's Shoes Building |
| Marquette School |
| Marr, James, House and Farm |
| Marshall County Court House |
| Marshall County Infirmary |
| Marshall, Thomas R., House |
| Marshall, Thomas R., School |
| Mars Theatre |
| Martens |
| Martin County Courthouse |
| Martinsville High School Gymnasium |
| Martinsville Sanitarium |
| Martinsville Vandalia Depot |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple |
| Massachusetts |
| Mattison, Donald M., House |
| Mayfield, Leroy, House |
| Mayleeno |
| McCallum, William, House |
| McClain, John W., House |
| McClelland-Layne House |
| McColloch-Weatherhogg Double House |
| McCormack-Bowman House |
| McCormick, Charles, Building |
| McCormick's Creek State Park Entrance and Gatehouse |
| McCulloch, Hugh, House |
| McCurdy Building (Sears, Roebuck and Company Building) |
| McCurdy Hotel |
| McDonald, James and Lucinda, House |
| McDowell, Mabel, Elementary School |
| McEwen-Samuels-Marr House |
| McGill, Charles S. and Mary, House |
| McHaffie, Melville F., Farm |
| McJohnston Chapel and Cemetery |
| McKay |
| McKim Observatory, DePauw University |
| McKinley School |
| McNamee-Ford House |
| Mead Johnson River-Rail-Truck Terminal and Warehouse |
| Meier, George Philip, House |
Data from United States Park Service and Wikidata
