Maryland - Area of significance: Industry
| Amelung House and Glassworks |
| American Brewery |
| American Ice Company |
| American Ice Company Baltimore Plant No. 2 |
| Antietam Furnace Complex Archeological Site |
| Antietam Iron Furnace Site and Antietam Village |
| Avondale |
| Avondale Mill |
| Bagby Furniture Company Building |
| Baker, James B., House |
| Baltimore County School No. 7 |
| Bare Hills Historic District |
| Barre Circle Historic District |
| Bloomsbury |
| B & O Bridge |
| B & O Railroad Potomac River Crossing |
| Borden Mines Superintendent's House |
| Bowman House |
| Brewers Hill Historic District |
| Brick Hill |
| Brookeville Woolen Mill and House |
| Buckeystown Historic District |
| Canton Historic District |
| Catoctin Furnace Historic District |
| Catoctin Mountain Park |
| Cecil's Mill Historic District |
| Chance Boatyard |
| Coca-Cola Baltimore Branch Factory |
| Coca-Cola Bottling Company of Baltimore Building |
| Cool Hollow Home |
| Corbett Historic District |
| Cover's Tannery |
| Daniels Mill |
| Dickeyville Historic District |
| Doub Farm |
| Dundalk Historic District |
| Elkridge Furnace Complex |
| Ellicott City Station |
| Ellicott's Mills Historic District |
| Emerson Bromo-Seltzer Tower |
| Equitable Gas Works |
| Erlanger Buildings |
| Evergreen on the Falls |
| Fair Meadows |
| Federal Hill Historic District |
| Fletcher, K. B., Mill |
| Footer's Dye Works |
| Frostburg Historic District |
| Funkstown Historic District |
| Gambrill House |
| Gandy Belting Company Building |
| Glencoe |
| Glenn L. Martin Company Plant No. 2 |
| Granite Historic District |
| Grief, L. and Bro., Inc. Manufactory |
| Guilford Quarry Pratt Through Truss Bridge |
| Gunther Brewing Company |
| Hagerstown City Park Historic District |
| Haley, Francis, House |
| Hampden Historic District |
| Hampton National Historic Site |
| Harford Furnace Historic District |
| Heiser, Rosenfeld, and Strauss Buildings |
| Hendler Creamery |
| Hitt's Mill and Houses |
| Hooper, James E., House |
| Hughesville Commercial and Tobacco Warehouse Historic District |
| Husband Flint Mill Site |
| Industrial Building |
| Ivory Mills |
| Jericho Farm |
| Jerusalem Mill Village |
| Keedysville Historic District |
| Klots Throwing Company Mill |
| Krug Iron Works |
| Lewis Mill Complex |
| Lime Kiln Bottom |
| Linchester Mill |
| Linwood Historic District |
| Lion Brothers Company Building |
| Little Montgomery Street Historic District |
| Locust Point Historic District |
| Loft Historic District North |
| Loft Historic District South |
| Lonaconing Furnace |
| Lonaconing Historic District |
| Londontown Manufacturing Company, Inc. |
| Long Island Farm |
| Lore, J. C., Oyster House |
| Lower Deer Creek Valley Historic District |
| Mannheim |
| Marsh Mills |
| Maryland White Lead Works |
| MARY W.SOMERS (Chesapeake Bay skipjack) |
| Meadows, The |
| Miller, H.F. Miller & Son Tin Box and Can Manufacturing Plant |
| Mill Green Historic District |
| Mount Savage Historic District |
| Mount Vernon Mill No. 1 |
| Mount Washington Mill |
Data from United States Park Service and Wikidata
