All - Architectural style - Neoclassical architecture
| Huron County Children's Home |
| Hutchinson Carnegie Library |
| Hutchinson Public Carnegie Library |
| Hutton Building |
| H.W. Gates Funeral Home |
| Hyde House |
| Hyde, Samuel, House |
| Hylton Hall |
| Idle Hours |
| Illinois Central Railroad Depot |
| Imboden Methodist Episcopal Church, South |
| Immanuel Baptist Church |
| In and Out Social Club |
| Independence Public Carnegie Library |
| Indiana Limestone Company Building |
| Indianapolis Fire Headquarters and Municipal Garage |
| Indianapolis Masonic Temple |
| Indiana State Capitol |
| Indianola Carnegie Library |
| Indian Orchard Branch Library |
| India Temple Shrine Building |
| Industrial Arts Building |
| Industrial Arts Building |
| Inman Hotel |
| Inman House |
| Institute of the Pennsylvania Hospital |
| International Hotel |
| International Mercantile Marine Company Building |
| Inyo County Courthouse |
| Ionia County Courthouse |
| I.O.O.F. Hall |
| Iowa Commission for the Blind Building |
| Iowa Soldiers' Orphans' Home |
| Iowa State Capitol |
| Ipswich State Bank |
| Iron River Town Hall |
| Ironwood Carnegie Library |
| Irwin County Courthouse |
| Ithaca Gas and Electric Corporation Building |
| Itmann Company Store and Office |
| Ivernia Apartment Building |
| Jackman Building |
| Jackson Building |
| Jackson County Courthouse |
| Jackson County Courthouse |
| Jackson County Courthouse |
| Jackson County Courthouse |
| Jackson District Library |
| Jackson House |
| Jackson-Johns House |
| Jackson, Prior, Homeplace |
| Jackson School |
| Jackson Shore Apartments |
| Jacksonville Post Office |
| Jaeckel Hotel |
| Janesville Free Public Library |
| Jasper County Courthouse |
| Jecker, E. J., House |
| Jeff Davis County Courthouse |
| Jeff Davis County Courthouse |
| Jefferson County Courthouse |
| Jefferson Davis Hospital |
| Jefferson Elementary School |
| Jefferson Methodist Church |
| Jefferson Street Historic District |
| Jefferson Trust Company |
| Jeffrey Manufacturing Company Office Building |
| Jenkins County Courthouse |
| Jensen, Lars and Agnes, House |
| Jernigan, Thomas P., House |
| Jerome National Bank |
| Jersey City YMCA |
| Jewish Center of Kings Highway |
| J. M. S. Building |
| Johnson County Courthouse |
| Johnson, J. Beale, House |
| Johnson-McCuistion House |
| Johnson's Woods |
| Johnston County Courthouse |
| Johnston Hall |
| Johnston Library |
| Joliet, Louis, Hotel |
| Jonas, Charles R., Federal Building |
| Jones, G.W., Building |
| Jones Home for Children |
| Jones Memorial Library |
| Jones, Oliver P., House |
| Jones, Pearl J., House |
| Jones, Sam, Memorial United Methodist Church |
| Jones School |
| Jons-Gilvin House |
| Joplin Carnegie Library |
| Joplin Connor Hotel |
| Jordanville Public Library |
| J. P. Morgan & Co. Building |
| Juhre, Charles, House |
| Julia Street Memorial United Methodist Church |
| Jung Shoe Manufacturing Company Factory |
| Kahului Railroad Administration Building |
| Kanawha |
Data from United States Park Service and Wikidata
