Maryland - Criteria: A (event)
| 16 Altamont Terrace |
| Abraham Hall |
| African Methodist Episcopal Church |
| Airview Historic District |
| Alcott, Louisa May, School |
| All Hallows' Church |
| All Saints' Church |
| Amelung House and Glassworks |
| American Brewery |
| American Ice Company |
| American Ice Company Baltimore Plant No. 2 |
| Ammendale Normal Institute |
| Annapolis National Cemetery |
| Anne Arundel County Free School |
| Anneslie Historic District |
| Annington |
| Antietam Furnace Complex Archeological Site |
| Antietam Iron Furnace Site and Antietam Village |
| Antietam National Battlefield |
| Arcadia |
| Arcadia-Beverly Hills Historic District |
| Arter, Solomon, House |
| Artisan's House |
| Asbury Methodist Episcopal Church |
| Ash Hill |
| Ashland |
| Auchentoroly Terrace Historic District |
| Avery, Capt. Salem, House |
| Avondale Mill |
| Bagby Furniture Company Building |
| Baker Farm |
| Baltimore and Ohio Locust Point Grain Terminal Elevator |
| Baltimore and Ohio Railroad Station, Oakland |
| Baltimore and Ohio Transportation Museum and Mount Clare Station |
| Baltimore City College |
| Baltimore City Hall |
| Baltimore City Passenger Railway Power House and Car Barn |
| Baltimore College of Dental Surgery |
| Baltimore County Jail |
| Baltimore County School No. 7 |
| Baltimore East/South Clifton Park Historic District |
| Baltimore Gas and Electric Company Building |
| Baltimore General Dispensary |
| Baltimore Grand |
| Baltimore Hebrew Congregation Synagogue |
| Baltimore Light Station |
| Baltimore National Cemetery |
| BALTIMORE (tug) |
| Baltimore-Washington Parkway |
| BANCROFT (motor vessel) |
| Bare Hills Historic District |
| Barney, Commodore Joshua, House |
| Barre Circle Historic District |
| Bates, Wiley H., High School |
| Beall-Dawson House |
| Beall's Pleasure |
| Beckford |
| Belair |
| Bel Air Armory |
| Bel Air Courthouse Historic District |
| Belair Stables |
| Bellefields |
| Bellona-Gittings Historic District |
| Bell Tower Building |
| Belvedere Hotel |
| Bennett-Kelly Farm |
| Bennies Hill Road Bridge |
| Benson Building |
| B'er Chayim Temple |
| Berea-Biddle Street Historic District |
| Berkley Crossroads Historic District |
| Berkley School |
| BERNICE J. (skipjack) |
| Bethesda Meetinghouse |
| Bethesda Naval Hospital Tower |
| Bethesda Theatre |
| Bethlehem Methodist Episcopal Church |
| Betterton Historic District |
| BILLIE P. HALL (log canoe) |
| Bloomington Viaduct |
| Bloomsbury |
| B & O Bridge |
| Bohemian National Cemetery |
| Bollman Suspension and Trussed Bridge |
| Boonsboro Historic District |
| B & O Railroad Potomac River Crossing |
| Borden Mines Superintendent's House |
| Bostwick |
| Bowie Railroad Buildings |
| Bowieville |
| Bowlingly |
| Breakneck Road Historic District |
| Brewers Exchange |
| Brick Hill |
| Brightwood |
| Broad Creek Historic District |
| Brookeville Historic District |
| Brookeville Woolen Mill and House |
| Brooklandville House |
| Brown, Alex, Building |
Data from United States Park Service and Wikidata
