Ohio - Criteria: B (person)
| Harrison, William Henry, Tomb State Memorial |
| Hartman Hotel |
| Harvey, Eli, House |
| Harvey, Elizabeth, Free Negro School |
| Hawthorn Hill |
| Hayden Building |
| Hayes, Rutherford B., House |
| Hemann, Joseph A., House |
| Hendry, Francis, House |
| Henn, Albert W., Mansion |
| Henry, Robert W., House |
| Herrold, Thomas Jefferson, House and Store |
| Hertzler, Daniel, House |
| Hess, Elmer, House |
| Hill, James Delos, House |
| Hinde, James J., House |
| Hise, Daniel Howell, House |
| Hollencamp House |
| Hosford House |
| House, Col. Erastus, House |
| House Of Four Pillars |
| Howard, Adam, House |
| Hoyt Block |
| Hubbard, Col. William, House |
| Hueston, Matthew, House |
| Huffman Field |
| Huffman Historic District |
| Hughes Manor |
| Hughes School |
| Hulburt, Halsey, Homestead |
| Hull, Isaac, Store |
| Hull, Jasper G., House |
| Hull-Wolcott House |
| Hunter, Norvall, Farm |
| Hunter, William, House |
| Hunting Lodge Farm |
| Huntington, John, Pumping Tower |
| Iddings, Benjamin, Log House |
| Ikirt House |
| Jackson, Andrew, House |
| Jacobs, Felix A., House |
| James, Charles Worth, House |
| Jefferson Avenue Historic District |
| Jeffrey, Malcolm, House |
| Jewett, Frank, House |
| J & M Trading Post |
| John, Jehu, House |
| John Sherman Birthplace |
| Johnson, John, Farm |
| Jones, Elijah Pelton, House |
| Joyce, Jacob O., House |
| Kauber, Warren F., Funeral Home |
| Kelley, Barney, House |
| Kellogg, John, House and Barn |
| Kelly Family Home |
| Kemp, Lewis, House |
| Kenton-Hunt Farm |
| Kenton Public Library |
| Kettering, Charles F., House |
| Kilbourn Commercial Building |
| Kilbourn, William, House |
| Kilgour, Frederick G., House |
| Kimball, Addison, House |
| Kimball, Lemuel II, House |
| Kimball, Solomon, House |
| King, Ahimaaz, House |
| King, George W., Mansion-Etowah |
| Kinney, Aaron, House |
| Kinney, Eli, House |
| Kirby, Josiah, House |
| Kirker, Gov. Thomas, Homestead |
| Kirkwood, Joseph, House |
| Kiser Mansion |
| Koch, John E., Jr., House |
| Koehne-Poast Farm |
| Kokosing House |
| Kossuth Colony Historic District |
| Krippendorf Estate |
| Krumm House |
| Lambert-Parent House |
| Langston, John Mercer, House |
| Langstroth Cottage |
| Lansdowne House |
| Lash, William D., House |
| Latty, Judge Alexander, House |
| Laughlin, Homer, House |
| Laundon, Thomas W., House |
| Lawrence, William, House |
| Layman, Christopher C., Law Office |
| Lay, Samuel, House |
| Leesville Town Hall |
| Levering Hall |
| Lewis, Dr. A. C., House |
| Libbey, Edward D., House |
| Liggett-Freedlander House |
| Lilienthal Building |
| Linaweaver, Dr. Albert, House |
| Livingston, Alexander W., House |
| Lloyd, John Uri, House |
| Lockwood, J. C., House |
Data from United States Park Service and Wikidata
