Indiana - Criteria: C (architecture/engineering)
| Indiana State Capitol |
| Indiana State Library and Historical Building |
| Indiana State Soldiers Home Historic District |
| Indiana Theatre |
| Indiana Theatre |
| Indiana War Memorial Historic District |
| Indian Village Historic District |
| Indi-Illi Park Historic District |
| Ingle Terrace |
| Irvington Historic District |
| Irvington Terrace Historic District |
| Irwin Union Bank and Trust |
| Jackson Bridge |
| Jackson County Courthouse |
| Jackson, Lowell E. and Paula G., House |
| Jackson-Monroe Terraces Historic District |
| Jacoby Church and Cemetery |
| James E. Roberts School 97 |
| Jasper County Courthouse |
| Jaworowski, George and Adele, House |
| Jay, Abijah C., House |
| Jay County Courthouse |
| Jefferson County Jail |
| Jefferson Elementary School |
| Jefferson Historic District |
| Jefferson Street Historic District |
| Jefferson Union Church and Sweet Cemetery |
| Jeffries Ford Bridge |
| Jenkins, Israel, House |
| Jenkins Place |
| Jerman School |
| Jerolaman-Long House |
| Jersey Park Farm |
| Jessup, Joel, Farm |
| J. M. S. Building |
| Johnson County Courthouse Square |
| Johnson-Denny House |
| Johnson's Creamery |
| Johnson's, Oliver, Woods Historic District |
| Jones, Col. William, House |
| Jones, Lewis, House |
| Jones, Margaret and George Riley, House |
| Jordan, Arthur, Memorial Hall |
| Journal-Gazette Building |
| Judie, James A., House |
| Judson Building |
| Julian-Clark House |
| Jump, Dr. Samuel Vaughn, House |
| Junction Railroad Depot |
| Kamm and Schellinger Brewery |
| Keilman, Francis P. House |
| Keip, John, House |
| Kelham, Edward, House |
| Kelley-Fredrickson House and Office Building |
| Kellum, Noah and Hannah Hadley, House |
| Kendallville Downtown Historic District |
| Kennedy, Archibald M., House |
| 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 |
| Kirshbaum, Raphael, Building |
| Kitselman, Alva, House |
| Kixmiller's Store |
| Kline, John and Minerva, Farm |
| Knights of Columbus Building |
| Knights of Columbus-Indiana Club |
| Knights of Pythias Lodge |
| Knightstown Academy |
| Knightstown Historic District |
| Knox County Poor Asylum |
| Koerting, William and Helen, House |
| Koester/Patburg House |
| Kokomo City Building |
| Kokomo County Club Golf Course |
| 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 |
Data from United States Park Service and Wikidata
