Ohio - Criteria: C (architecture/engineering)
| Henninger, Phillip, House |
| Henry County Courthouse |
| Henry County Sheriff's Residence and Jail |
| Henry, Robert W., House |
| Herold Building |
| Herr, Christian S., House |
| Herrington, John, House and Herrington Bethel Church |
| Herron Gymnasium |
| Hertzler, Daniel, House |
| Hess, Elmer, House |
| Hessler Court Wooden Pavement |
| Heter Farm |
| Hewson-Gutting House |
| Heyne-Zimmerman House |
| Hidley, James P., Cottage |
| Higby House |
| Higgins, H. A., Building |
| Higginsport School |
| High and Gay Streets Historic District |
| High House |
| Highland County Courthouse |
| Highland Egg and Poultry Company Building |
| High Street Commercial Block |
| Hildreth Covered Bridge |
| Hillcrest Hotel |
| Hilliard Methodist Episcopal Church |
| Hill, James, House |
| Hill, Jediah, Covered Bridge |
| Hinde, James J., House |
| Hine, Horace L., House |
| Hirons-Brown House |
| Historic Associate Reformed Church and Cemetery |
| Hizey Covered Bridge |
| Hoadley, George, Jr., House |
| Hobart, E. A., House |
| Hocking Valley Railway Historic District |
| Hoffman House |
| Hoffner Historic District |
| Hollencamp House |
| Hollister-Parry House |
| Holmes County Courthouse And Jail |
| Holy Angels Church |
| Holy Cross Church, Rectory and School |
| Holy Cross Lithuanian Roman Catholic Church |
| Holy Cross Monastery and Chapel |
| Holy Family Catholic Church |
| Holy Rosary Catholic Church |
| Holy Rosary Church |
| Home Building Association Bank |
| Home for the Aged Deaf |
| Honam, John, House |
| Hood-Simmons House |
| Hooper Building |
| Hoover Farm |
| Hopkins, Roswell, Residence |
| Horsey-Barthelmas Farm |
| Horton, Capt. Charles, House |
| Hosack House |
| Hosford House |
| Hosford, John, House |
| Hostetter Inn |
| Hotel Argonne |
| Hotel Ashtabula |
| Hotel Central |
| Hotel Courtland |
| Hotel Harding |
| Hotel Rieger |
| Hotel Statler |
| House at 1022 West Main Street |
| House at 121 South Ridge |
| 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 |
| Hower Mansion |
| Howe Tavern |
| Hoyt Block |
| Hruby Conservatory of Music |
| Hubbard Cooke Block |
| Hubbard, Lester, House |
| Hubbard, S. B., House |
| Huber, Dr. H., Block |
| Hudson Historic District |
| Hueston, Matthew, House |
| Huffman Covered Bridge |
| Huffman Field |
| Huffman Historic District |
| Hughes Manor |
| Hughes School |
| Hulbert House and McAlpin Bridal Cottage |
| Hulburt, Halsey, Homestead |
Data from United States Park Service and Wikidata
