Maryland - Role: Building
| Gunn, Samuel, House |
| Gunpowder Meetinghouse |
| Gunther Brewing Company |
| Habre-de-Venture; Thomas Stone National Historic Site |
| Hager House |
| Hagerman, William, Farmstead |
| Hagerstown Armory |
| Hagerstown Charity School |
| Haley, Francis, House |
| Half-Way House |
| Hamilton, James, House |
| Hammond-Harwood House |
| Hampstead School |
| Hancock's Resolution |
| Handsell |
| Hanover Farm House |
| Hard Bargain Farm |
| Hard Lodging |
| Harford National Bank |
| Harmony Hall |
| Harper, George, Store |
| Harrington |
| Harris Farm |
| Harris, Nathan and Susannah, House |
| Harundale Presbyterian Church |
| Haviland, Edward W., House |
| Hawkins Pharsalia |
| Hayman, Jeptha, House |
| Hays-Heighe House |
| Hays House |
| Hays, Joseph C., House |
| Hayward's Lott |
| Hazelwood |
| Hebrew Orphan Asylum |
| Hebron |
| Heiser, Rosenfeld, and Strauss Buildings |
| Hendler Creamery |
| Henry's Grove |
| Hermitage, The |
| Hessian Barracks |
| Hidden Valley Farm |
| Highbarger, Jacob, House |
| Highfield House |
| Highland Lodge |
| Hilleary, William, House |
| Hill House |
| Hills, Dales, and the Vineyard |
| Hilltop Manor |
| Hilton |
| Hinchingham |
| Hippodrome Theatre |
| Hirsch Residence |
| His Lordship's Kindness |
| Hitt's Mill and Houses |
| Hobson's Choice |
| Hocking House |
| Hoffman Farm |
| Hoffman, Isaac, House |
| Holly Hall |
| Holly Hill |
| Holy Cross Roman Catholic Church |
| Home of the Friendless |
| Homewood |
| Honeysuckle Lodge |
| Hooper, James E., House |
| Hopeful Unity |
| Hope House |
| Hopewell |
| Hopewell |
| Hotel Kernan |
| House at 9 North Front Street |
| "House by the ""Town Gates""" |
| Houses At 16-22 East Lee Street |
| Howard Lodge |
| Howard Park P.S. 218 |
| Howard's Inheritance |
| Huckleberry Hall |
| Hughes A.M.E. Chapel |
| Hull Memorial Christian Church |
| Hutzler Brothers Palace Building |
| Hyattsville Armory |
| Iglehart |
| Indian Queen Tavern and Black's Store |
| Indian Range |
| Industrial Building |
| Ingram-Schipper Farm |
| Ivory Mills |
| Jackson, Lillie Carroll, House |
| Jackson, Sen. William P., House |
| Jena |
| Jericho Farm |
| John Brown's Headquarters |
| Johns Hopkins Hospital Complex |
| Johnsontown Tobacco Barn No. 2 |
| Johnson-Wolfe Farm |
| Johnston Building |
| Jones, Abraham, House |
| Joshua's Meadows |
| Kaese Mill |
| Keating House |
Data from United States Park Service and Wikidata
