Ohio - Role: Building
| House at 129 South Ridge |
| House at 145 South Ridge |
| House at 203 Penn Road |
| House at 624 Washinton St. |
| House at 753 East Broad Street |
| House, Col. Erastus, House |
| House Of Four Pillars |
| House of Wills |
| House on Huron Ave. |
| Housley, R. A., House |
| Houston House |
| Howard, Adam, House |
| Howard, C. R., House |
| Howell and Anna Powell Farm |
| Hower Mansion |
| Howe Tavern |
| Hoyt Block |
| Hruby Conservatory of Music |
| Hubbard, Col. William, House |
| Hubbard Cooke Block |
| Hubbard, Lester, House |
| Hubbard, S. B., House |
| Huber, Dr. H., Block |
| Hueston, Matthew, House |
| Hughes Manor |
| Hughes School |
| Hulbert House and McAlpin Bridal Cottage |
| Hulburt, Halsey, Homestead |
| Hull, Isaac, Store |
| Hull, Jasper G., House |
| Hull, Patrick, House |
| Hull Place |
| Hull-Wolcott House |
| Humberger House |
| Hummel, George, House |
| Hune, William, Farm |
| Hunter, James, Stone House |
| Hunter, Norvall, Farm |
| Hunter, William, House |
| Hunting Lodge Farm |
| Huntington, Franz, House |
| Huntington Grange |
| Huntington Inn, Old |
| Huntington Public School |
| Huntington Township Hall |
| Hunt-Wilke Farm |
| Huron County Children's Home |
| Huron School |
| Hurst, William E., House |
| Hurth Hotel |
| Hyde Park Methodist Episcopal Church |
| Iddings, Benjamin, Log House |
| Ideal Department Store Building |
| Ijams, Joseph, House |
| Ikirt House |
| Immaculate Conception Catholic Church Complex |
| Immaculate Conception Church |
| Immaculate Conception Church, School, and Rectory |
| Immaculate Conception Rectory at Botkins |
| Imperial Glass Company |
| Independence Presbyterian Church |
| Independent Order of Oddfellows, Dayton Lodge No. 273 |
| Independent Order of Odd Fellows Temple |
| Independent School District No. 2 Building |
| Indian Mill |
| Indianola Junior High School |
| Ingalls Building |
| Ingersoll, Cyrus J., House |
| Insco Apartments Building |
| Inselruhe |
| Ira Apartments |
| Ireland, Joseph, House |
| Isham, John, House |
| Island House |
| Iutzi, Christian, Farm |
| Izant, Grace Goulder, House |
| Jackson, Andrew, House |
| Jackson Jr. High School |
| Jacob's Church |
| Jacobs, Felix A., House |
| Jaeger Machine Company Office Building |
| James A. Garfield National Historic Site |
| James, Charles Worth, House |
| Jamestown Opera House |
| Jarvis House |
| Jay's Lunch |
| Jefferson Schoolhouse |
| Jefferson Town Hall |
| Jeffrey, Malcolm, House |
| Jeffrey Manufacturing Company Office Building |
| Jenkins-Perry House |
| Jennings Apartments |
| Jersey Independent Order of Odd Fellows Hall |
| Jewett, Frank, House |
| J & M Trading Post |
| J & M Trading Post - Annex |
| John, Jehu, House |
| John Sherman Birthplace |
| Johnson-Campbell House |
| Johnson, Dustin, Residence |
Data from United States Park Service and Wikidata
