Indiana - Criteria: A (event)
| Irvington Terrace Historic District |
| Jackson Bridge |
| Jackson County Courthouse |
| Jackson-Monroe Terraces Historic District |
| Jacobs, Terrell, Circus Winter Quarters |
| Jacoby Church and Cemetery |
| James E. Roberts School 97 |
| Jamieson-Bennett House |
| Jeffers Bridge |
| Jefferson Elementary School |
| Jefferson Street Historic District |
| Jefferson Union Church and Sweet Cemetery |
| Jeffries Ford Bridge |
| Jenkins, Israel, House |
| Jenkins Place |
| Jerman School |
| Johnson County Courthouse Square |
| Johnson-Denny House |
| Johnson's Creamery |
| Johnson's, Oliver, Woods Historic District |
| Journal-Gazette Building |
| Junction Railroad Depot |
| Kamm and Schellinger Brewery |
| Kendallville Downtown Historic District |
| Keplinger, Harry A., House |
| Kerr, William, House |
| Kimmell Park |
| Kinzer, John, House |
| Kirby Historic District |
| Kirklin Public Library |
| Kirshbaum, Raphael, Building |
| Kixmiller's Store |
| Kline, John and Minerva, Farm |
| Knights of Pythias Building and Theatre |
| Knightstown Historic District |
| Knox County Poor Asylum |
| Koester/Patburg House |
| Kokomo County Club Golf Course |
| Kokomo Courthouse Square Historic District |
| Kokomo High School and Memorial Gymnasium |
| Lafayette Place Historic District |
| LaFontaine Historic District |
| La Grange County Courthouse |
| Lake County Courthouse |
| Lake County Sheriff's House and Jail |
| Lake County Tuberculosis Sanatorium Nurses Home and Superintendent's House |
| Lake Erie and Western Depot Historic District |
| Lakeside Historic District |
| Lakeville High School |
| Lamb's Creek Bridge |
| Landers, Franklin-Black and Adams Farm |
| Landing, The, Historic District |
| LaSalle Annex |
| LaSalle Hotel |
| Lassen Hotel |
| Laurel and Prospect District |
| Lauter, H., Company Complex |
| Learner Building |
| Leatherwood Station Bridge |
| Leedy, Bert, Round Barn |
| Leeper, Samuel, Jr., House |
| Leesburg Historic District |
| Legg House |
| Leive, Parks and Stapp Opera House |
| Leland Hotel |
| Lemmon's Church and Cemetery |
| Lentz House (Hotel Sheller) |
| Lerner Theatre |
| Liberty Baptist Church |
| Liberty Courthouse Square Historic District |
| Liberty Residential Historic District |
| Liberty Township Schoolhouse No. 2 |
| Ligonier Historic District |
| Lilly Biological Laboratories |
| Lincoln Boyhood National Memorial |
| Lincoln Park School |
| Lincoln Pioneer Village |
| Lincolnshire Historic District |
| Lincoln Street Historic District |
| Linden Depot |
| Linton Commercial Historic District |
| Linton Public Library |
| Linton Township High School and Community Building |
| Linwood Colonial Apartments |
| Little Cedar Grove Baptist Church |
| Little Crow Milling Company Factory |
| Littleton, Frank, Round Barn |
| Lockefield Garden Apartments |
| Lockheed PV-2 Harpoon No. 37396 |
| Lockyear College |
| Lodge |
| Long Schoolhouse |
| Loring, Dr. David J., Residence and Clinic |
| Lowell Commercial Historic District |
| Luckey Hospital |
| Lyles Consolidated School |
| Lynd School |
| Madden School |
| Madison County Bridge No. 149 |
| Madison Historic District |
Data from United States Park Service and Wikidata
