Indiana - Area of significance: Architecture
| Kelham, Edward, House |
| Kelley-Fredrickson House and Office Building |
| Kellum, Noah and Hannah Hadley, House |
| Kendallville Downtown Historic District |
| Kennedy, Archibald M., House |
| Kennedy-Hoffa House |
| Kensington Boulevard Historic District |
| Kent House and Hitchens House |
| Keplinger, Harry A., House |
| Kerr, John G., Company |
| Kerr, William, House |
| Keyser Township School 8 |
| Kimbrough, Emily, Historic District |
| Kimmell Park |
| King-Dennis Farm |
| Kingsbury-Doak Farmhouse |
| Kintner House Hotel |
| Kintner-McGrain House |
| Kintner-Withers House |
| Kinzer, John, House |
| Kirby Historic District |
| Kirklin Public Library |
| Kirkwood Park Historic District |
| Kirshbaum, Raphael, Building |
| Kitselman, Alva, House |
| Kixmiller's Store |
| Kline, John and Minerva, Farm |
| Kneipp Springs Historic District |
| Knights of Columbus Building |
| Knights of Columbus-Indiana Club |
| Knights of Pythias Lodge |
| Knightstown Academy |
| Knightstown Historic District |
| Knightstown, Old, and Glen Cove Cemeteries |
| Knox County Poor Asylum |
| Koerting, William and Helen, House |
| Koester/Patburg House |
| Kokomo City Building |
| Kokomo Courthouse Square Historic District |
| Kokomo High School and Memorial Gymnasium |
| Koontz, John F. and Malissa, House |
| Kosciusko County Jail |
| Kresge-Groth Building |
| Kuebler-Artes Building |
| Kuehn, August, House |
| Kuhn, Charles, House |
| Lackey-Overbeck House |
| Ladywood Estates |
| 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 |
| Landers, Franklin-Black and Adams Farm |
| Landing, The, Historic District |
| Lane, Henry S., House |
| Lanier Mansion |
| LaSalle Annex |
| LaSalle Hotel |
| Lauter, H., Company Complex |
| Lawton, Chauncey N., House |
| Learner Building |
| Leedy, Bert, Round Barn |
| Leeper, Samuel, Jr., House |
| Leesburg Historic District |
| Legg House |
| Lehmback, Charles, Farmstead |
| Leich, Charles, and Company |
| Leive, Parks and Stapp Opera House |
| Leland Hotel |
| Lenhart Farmhouse |
| Lentz House (Hotel Sheller) |
| Lerner Theatre |
| Levey, Louis, Mansion |
| Lewis, Thomas J., House |
| 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 Heights Historic District |
| Lincoln Park School |
| Lincolnshire Historic District |
| Lincoln Street Historic District |
| Lindley, Thomas Elwood, House |
| Linton Commercial Historic District |
| Linton Public Library |
| Linwood Colonial Apartments |
| Little Cedar Grove Baptist Church |
| Littleton, Frank, Round Barn |
| Lockefield Garden Apartments |
| Lockerbie Square Historic District |
| Lock No. 33 Lock Keeper's House, and Wabash and Erie Canal Lock No. 33 |
| Lockyear College |
Data from United States Park Service and Wikidata
