Maryland - Area of significance: Commerce
| Hutzler Brothers Palace Building |
| IDA MAY |
| Indian Queen Tavern and Black's Store |
| Inns on the National Road |
| ISLAND BIRD (log canoe) |
| ISLAND BLOSSOM (log canoe) |
| ISLAND IMAGE (log canoe) |
| Jerusalem Mill Village |
| Jones, Abraham, House |
| Joshua's Meadows |
| Kaese Mill |
| KATHRYN |
| KATHRYN (Chesapeake Skipjack) |
| Layton House |
| Leitersburg Historic District |
| Lewis Mill Complex |
| Linchester Mill |
| Linwood Historic District |
| Locust Point Historic District |
| Loft Historic District North |
| Loft Historic District South |
| Lonaconing Furnace |
| Lord Baltimore Hotel |
| Lore, J. C., Oyster House |
| Lorraine Park Cemetery Gate Lodge |
| Lowe, Joshua, House |
| Maddux House |
| MAGGIE LEE |
| MAGIC (log canoe) |
| Mannheim |
| Market Center |
| Market Master's House |
| MARY W.SOMERS (Chesapeake Bay skipjack) |
| Middletown Historic District |
| MINNIE V |
| Mitchell House |
| Montgomery County Courthouse Historic District |
| Montgomery Ward Warehouse and Retail Store |
| Mount Airy |
| National Enameling and Stamping Company |
| NELLIE CROCKETT |
| NELLIE L. BYRD |
| New Market Historic District |
| North Central Historic District |
| Oakland Historic District |
| Old Inn, The |
| Old Joppa Site |
| Owensville Historic District |
| Ozmon, Capt. John H., Store |
| Parkton Hotel |
| PERSISTENCE (log canoe) |
| Pocomoke City Historic District |
| Poole and Hunt Company Buildings |
| Poolesville Historic District |
| Port Deposit |
| Port Tobacco Historic District |
| Potomac-Broadway Historic District |
| Potter Hall |
| President Street Station |
| Princess Anne Historic District |
| Radcliffe Mill |
| RALPH T. WEBSTER |
| REBECCA T. RUARK |
| Reisterstown Historic District |
| RELIANCE (Chesapeake Bay skipjack) |
| Rieman Block |
| Roberts Inn |
| ROVER (log canoe) |
| RUBY G. FORD |
| Saint Michaels Mill |
| SANDY (log canoe) |
| S. C. DOBSON (log canoe) |
| Schwartze Mansion |
| SEA GULL |
| SIGSBEE |
| SILVER HEEL (log canoe) |
| South Central Avenue Historic District |
| South Chesapeake City Historic District |
| Southern Terminal, Susquehanna and Tidewater Canal |
| Sprechers Mill House |
| Standard Oil Building |
| STANLEY NORMAN |
| Stevensville Bank |
| Stevensville Historic District |
| Stewart's Department Store |
| Stone Hill Historic District |
| SUSAN MAY |
| Taneytown Historic District |
| TENNISON, WM. B. (Chesapeake Bay Bugeye) |
| Terminal Warehouse |
| The Wilderness |
| THOMAS W. CLYDE |
| Tidewater Inn |
| Timber Neck Farm |
| Troth's Fortune |
| Trovinger Mill |
| Union Bridge Historic District |
| Union Bridge Station |
| Union Square-Hollins Market Historic District |
| Uniontown Historic District |
Data from United States Park Service and Wikidata
