Maryland - Significance region: National
| Accokeek Creek Site |
| Annapolis National Cemetery |
| Antietam National Battlefield |
| Ash Hill |
| Bachrach, David, House |
| Baltimore and Ohio Transportation Museum and Mount Clare Station |
| Baltimore National Cemetery |
| BALTIMORE (tug) |
| Barney, Commodore Joshua, House |
| Battle Monument |
| Belair Stables |
| Belvoir |
| BERNICE J. (skipjack) |
| Bethesda Naval Hospital Tower |
| BILLIE P. HALL (log canoe) |
| Bladensburg Battlefield |
| Bohemia Farm |
| B & O Railroad Potomac River Crossing |
| Brice House |
| Broad Creek Soapstone Quarries |
| Carroll Mansion |
| Carrollton Viaduct |
| Carson, Rachel, House |
| Casselman's Bridge, National Road |
| Catoctin Mountain Park |
| Cedar Hill |
| Cedar Park |
| Chambers, Whittaker, Farm |
| Chase-Lloyd House |
| CHESAPEAKE (lightship) |
| Chestertown Historic District |
| Clara Barton National Historic Site |
| CLARENCE CROCKETT |
| CLAUDE W. SOMERS |
| College of Medicine of Maryland |
| College Park Airport |
| Colonial Annapolis Historic District |
| Crampton's Gap Historic District |
| Davidge Hall, University of Maryland |
| Doughoregan Manor |
| Drum Point Lighthouse |
| E.C. COLLIER |
| EDMEE S. (log canoe) |
| EDNA E. LOCKWOOD (Chesapeake Bay bugeye) |
| ELF, THE (yacht) |
| Ellicott City Historic District |
| Ellicott City Station |
| ELSWORTH |
| FANNIE L. DAUGHERTY |
| F. C. LEWIS, JR |
| Federal Hill Historic District |
| Fells Point Historic District |
| First Unitarian Church |
| Flag House |
| FLYING CLOUD (log canoe) |
| Fort Frederick State Park |
| Fort McHenry National Monument and Historic Shrine |
| Fort Washington |
| Fourpoints Bridge |
| Frederick Historic District |
| Friends Advice |
| Gaithersburg Latitude Observatory |
| Glen Echo Park Historic District |
| Greenbelt Historic District |
| Green Mount Cemetery |
| Habre-de-Venture; Thomas Stone National Historic Site |
| Hammond-Harwood House |
| Hampton National Historic Site |
| Havre de Grace Lighthouse |
| HELIANTHUS III (yacht) |
| Hessian Barracks |
| HILDA M. WILLING |
| His Lordship's Kindness |
| Holly Hill |
| Homewood |
| HOWARD (Skipjack) |
| Hoye Site |
| IDA MAY |
| Inns on the National Road |
| ISLAND BIRD (log canoe) |
| ISLAND BLOSSOM (log canoe) |
| ISLAND IMAGE (log canoe) |
| ISLAND LARK (log canoe) |
| JAY DEE (log canoe) |
| John Brown's Headquarters |
| Johns Hopkins Hospital Complex |
| KATHRYN |
| KATHRYN (Chesapeake Skipjack) |
| La Grange |
| La Vale Tollgate House |
| L'Hermitage Slave Village Archeological Site |
| Linwood Historic District |
| Lombard Street Bridge |
| London Town Publik House |
| Loudon Park National Cemetery |
| Lovely Lane Methodist Church |
| MAGGIE LEE |
| MAGIC (log canoe) |
| Maidstone |
| Mallows Bay-Widewater Historic and Archeological District |
Data from United States Park Service and Wikidata
