Maryland - Area of significance: Commerce
| American Brewery |
| Antietam National Battlefield |
| Bachrach, David, House |
| Bagby Furniture Company Building |
| Baltimore and Ohio Locust Point Grain Terminal Elevator |
| Baltimore and Ohio Transportation Museum and Mount Clare Station |
| Baltimore City Passenger Railway Power House and Car Barn |
| Baltimore Equitable Society |
| Baltimore Federal Savings & Loan Association |
| Baltimore Gas and Electric Company Building |
| Baltimore Grand |
| Bankard-Gunther Mansion |
| Bel Air Courthouse Historic District |
| Belt, J. A., Building |
| Benson Building |
| BERNICE J. (skipjack) |
| Betterton Historic District |
| BILLIE P. HALL (log canoe) |
| B & O Bridge |
| B & O Railroad Potomac River Crossing |
| Bostwick |
| Brewers Exchange |
| Brookeville Historic District |
| Brooklandville House |
| Brooklandwood |
| Brown, Alex, Building |
| Brown, Jeremiah, House and Mill Site |
| Brown's Arcade |
| Brunswick Historic District |
| Bryantown Historic District |
| Buckeystown Historic District |
| Buck House |
| Bunker Hill |
| Business and Government Historic District |
| Cambridge Historic District, Wards I and III |
| Canton Historic District |
| Canton House |
| Cecil's Mill Historic District |
| Centreville Historic District |
| Chamber of Commerce Building |
| Charlestown Historic District |
| Charles Village-Abell Historic District |
| CHESAPEAKE BAY BROGAN MUSTANG |
| Chesapeake Beach Railway Station |
| CHESAPEAKE (lightship) |
| Chestertown Railroad Station |
| Chesterville Brick House |
| Childs Residence |
| Chinatown Historic District |
| Citizens State Bank |
| CLARENCE CROCKETT |
| CLAUDE W. SOMERS |
| Coca-Cola Bottling Company of Baltimore Building |
| Cockey-Jamison-Hendrickson House and Store |
| Coffren, John W., House and Store |
| College Park Airport |
| Commercial Credit Company Building |
| Concord |
| Corbett Historic District |
| Crisfield Historic District |
| Crooked Intention |
| Cross Manor |
| Darlington Historic District |
| Denton Historic District |
| Doub's Mill Historic District |
| Downtown Cumberland Historic District |
| Easton Historic District |
| E.C. COLLIER |
| EDNA E. LOCKWOOD (Chesapeake Bay bugeye) |
| Ellicott City Historic District |
| Ellicott City Station |
| ELSWORTH |
| Emerson Bromo-Seltzer Tower |
| Emmitsburg Historic District |
| Eutaw-Madison Apartment House Historic District |
| FANNIE L. DAUGHERTY |
| F. C. LEWIS, JR |
| Federal Hill Historic District |
| Federal Hill South Historic District |
| Fells Point Historic District |
| FLYING CLOUD (log canoe) |
| Frostburg Historic District |
| Gandy Belting Company Building |
| Garrett Building |
| Gladden Farm |
| Glen Oak Hotel |
| Graystone Lodge |
| Grief, L. and Bro., Inc. Manufactory |
| Hagerstown Commercial Core Historic District |
| Hagerstown Historic District |
| Half-Way House |
| Harford National Bank |
| Havre de Grace Historic District |
| Havre de Grace Lighthouse |
| Heighe House |
| HILDA M. WILLING |
| Hitt's Mill and Houses |
| Hochschild, Kohn Belvedere and Hess Shoes |
| HOWARD (Skipjack) |
| Hughesville Commercial and Tobacco Warehouse Historic District |
Data from United States Park Service and Wikidata
