Maryland - Criteria: C (architecture/engineering)
| 16 Altamont Terrace |
| 200-208 Decatur Street |
| Abell house |
| Abington Farm |
| Abraham Hall |
| Academy Grove Historic District |
| Acquinsicke |
| Adams Farm |
| African Methodist Episcopal Church |
| Aigburth Vale |
| Airview Historic District |
| Airy Hill |
| All Faith Church |
| All Hallows' Church |
| All Hallows Episcopal Church |
| All Saints' Church |
| All Saints' Church |
| All Saints Church at Monie |
| Amelung House and Glassworks |
| American Ice Company |
| Ammendale Normal Institute |
| Anchorage, The |
| Anderson Chapel |
| Anneslie Historic District |
| Annington |
| Antietam Furnace Complex Archeological Site |
| Antietam Hall |
| Antrim |
| Appler-Englar House |
| Araby |
| Arcadia |
| Arcadia-Beverly Hills Historic District |
| Arlington |
| Arter, Philip and Uriah, Farm |
| Arter, Solomon, House |
| Artisan's House |
| Asbury Methodist Episcopal Church |
| Ash Hill |
| Ashland |
| Athol |
| Auburn House |
| Auchentoroly Terrace Historic District |
| Avalon |
| Avondale |
| Bachelor's Hope |
| Bachelor's Hope |
| Baker Farm |
| Baker, James B., House |
| Ballestone Mansion |
| Baltimore and Ohio Railroad Station, Oakland |
| Baltimore City College |
| Baltimore City College |
| Baltimore College of Dental Surgery |
| Baltimore County Courthouse |
| Baltimore County Jail |
| Baltimore County School No. 7 |
| Baltimore East/South Clifton Park Historic District |
| Baltimore Gas and Electric Company Building |
| Baltimore Grand |
| Baltimore Hebrew Congregation Synagogue |
| Baltimore Light Station |
| BALTIMORE (tug) |
| Baltimore-Washington Parkway |
| Bankard-Gunther Mansion |
| Bard's Field |
| Bare Hills Historic District |
| Bare Hills House |
| Barnaby House |
| Barney, Commodore Joshua, House |
| Barre Circle Historic District |
| Battle Monument |
| Beale, Edward, House |
| Beall-Dawson House |
| Beall's Pleasure |
| Beauchamp House |
| Beaudley |
| Beckford |
| Belair |
| Bel Air Armory |
| Bel Air Courthouse Historic District |
| Belair Stables |
| Bellefields |
| Bellevue |
| Bellona-Gittings Historic District |
| Bell Tower Building |
| Bell-Varner House |
| Belt, J. A., Building |
| Belvedere Hotel |
| Belvoir |
| Bennett-Kelly Farm |
| Bennett's Adventure |
| Bennies Hill Road Bridge |
| Benson Building |
| Benson-Hammond House |
| B'er Chayim Temple |
| Berea-Biddle Street Historic District |
| Berkley Crossroads Historic District |
| Berlin Commercial District |
| Best Endeavor |
| Bethesda Meetinghouse |
Data from United States Park Service and Wikidata
