All - Architectural style - Second Empire architecture in the United States and Canada
| Hawkins, Lorenzo D., House |
| Hay and Owen Buildings |
| Hays, John R., House |
| Hazlett, Robert W., House |
| Healey Asylum |
| Heck-Andrews House |
| Hecox, Frank J., House |
| Hedge Lawn |
| Hegeler-Carus Mansion |
| Hendricks County Jail and Sheriff's Residence |
| Henry County Courthouse |
| Henry County Sheriff's Residence and Jail |
| Henry, Jacob H., House |
| Hewson-Gutting House |
| Hill County Courthouse |
| Hill House |
| Hillsdale Station |
| Hirt, Alfred, House |
| Hockersmith, L. D., House |
| Hoge, Walter, House |
| Holbrook, Charles, House |
| "Holbrook-Palmer Estate, ""Elmwood""" |
| Holland, Captain, House |
| Hollenfelz House |
| Home of the Friendless |
| Homer-Lovell House |
| Hope Block and Cheapside |
| Hopewell Station |
| Hopper Court |
| Hotel Hurst |
| House at 105 Marion Street |
| House at 115-117 Jewett Street |
| House at 12 West Water Street |
| House at 16 Mineral Street |
| House at 199 Summer Avenue |
| House at 205 North Main Street |
| House at 216 Warren Street |
| House at 22 West Lamme |
| House at 230 Melrose Street |
| House at 362 Sea Cliff Avenue |
| House at 44 Linden Street |
| House at 5 Willow Court |
| House at 736 Palisado Avenue |
| Howe, Dr. John Quincy, House |
| Howe, John Badlam, Mansion |
| Howells, William Dean, House |
| Howels, William Dean, House |
| Hower Mansion |
| Hubbard, Renesselaer D., House |
| Hudson-Evans House |
| Hughson Mansion |
| Hull Place |
| Huseby, John H,. House |
| Hutchinson House |
| Hutchinson, Perry, House |
| Hutzler Brothers Palace Building |
| Hygeia House |
| Ikirt House |
| Inness, George, House |
| Jackson, Andrew, House |
| Jackson, F.A., House |
| Jesus Marie Convent |
| John Adams Courthouse |
| Jones, David, House |
| Jones, Elijah Pelton, House |
| Jones, Thomas W., House |
| Jones, William R., House |
| Jordan, Charles A., House |
| Jordan, F.M., House |
| J.S. Hollinger Farmstead |
| June, Lewis, House |
| Kamm, Jacob, House |
| Kensington Plantation House |
| Kingsley, Chester, House |
| Kiowa County Courthouse |
| Klindt, George, House |
| Knight, R. A.-Eugene Lacount House |
| Knightstown Academy |
| Krause, Frederick, Mansion |
| Krum, Hiram, House |
| La Grange County Courthouse |
| Lake County Sheriff's House and Jail |
| Lakeville Manor |
| Lampasas County Courthouse |
| Lampman, William, House |
| Lancaster Watch Company |
| Langmaid Building |
| Larrabee's Brick Block |
| Lawrence, William, House |
| Leport-Toupin House |
| Lewis County Courthouse |
| Lewis House |
| Lindsey, Samuel, House |
| Littlefield House |
| Littlefield-Roberts House |
| Loring, Harrison, House |
| Lovejoy, A. L., House |
| Lyceum Hall |
| MacAlpine |
| Madison County Courthouse |
Data from United States Park Service and Wikidata
