| City Name | County | Zip Code |
| Bainbridge | Cecil | 21904 |
| Bakersville | Washington | 21713 |
| Baldwin | Baltimore | 21013 |
| Baltimore City | Baltimore | ***** |
| Barclay | Queen Anne's | 21607 |
| Barksdale | Cecil | 21921 |
| Barnes Corner | Cecil | 21917 |
| Barnesville | Montgomery | 20838 |
| Barstow | Calvert | 20610 |
| Beallsville | Montgomery | 20839 |
| Beckleysville | Baltimore | 21074 |
| Bel Air | Harford | ***** |
| Bel Alton | Charles | 20611 |
| Belcamp | Harford | ***** |
| Beltsville | Prince George's | ***** |
| Benedict | Charles | 20612 |
| Benevola | Washington | 21713 |
| Bentley Springs | Baltimore | 21120 |
| Berkley | Harford | 21034 |
| Berlin | Worcester | 21811 |
| Berwyn Heights | Prince Georges | 20740 |
| Bethel | Cecil | 21915 |
| Bethesda | Montgomery | ***** |
| Bethlehem | Caroline | 21609 |
| Betterton | Kent | 21610 |
| Beverley Beach | Anne Arundel | 21037 |
| Big Pool | Washington | 21711 |
| Big Springs | Washington | 21722 |
| Bishop | Worcester | 21813 |
| Bishops Head | Dorchester | 21672 |
| Bishopville | Worcester | 21813 |
| Bittinger | Garrett | 21522 |
| Bivalve | Wicomico | 21814 |
| Bladensburg | Prince George's | ***** |
| Bloomington | Garrett | 21532 |
| Blue Mountain | Frederick | 21788 |
| Bolivar | Frederick | 21769 |
| Boonsboro | Washington | 21713 |
| Borden Shaft | Allegany | 21532 |
| Boring | Baltimore | 21020 |
| Bowie | Prince George's | ***** |
| Bowleys Quarters | Baltimore | 21220 |
| Bowling Green | Allegany | 21502 |
| Boyds | Montgomery | 20841 |
| Bozman | Talbot | 21612 |
| Braddock Heights | Frederick | 21714 |
| Bradshaw | Baltimore | 21021 |
| Brandywine | Prince George's | 20613 |
| Breezewood | Anne Arundel | 21113 |
| Brentwood | Prince George's | 20722 |
| Bridgeport | Carroll | 21787 |
| Brighton | Baltimore | 21207 |
| Brinklow | Montgomery | 20862 |
| Broad Run | Frederick | 21718 |
| Brookeville | Montgomery | 20833 |
| Brooklandville | Baltimore | 21022 |
| Brooklyn | Anne Arundel | 21225 |
| Broomes Island | Calvert | 20615 |
| Brownsville | Washington | 21715 |
| Brunswick | Frederick | 21716 |
| Bryans Road | Charles | 20616 |
| Bryantown | Charles | 20617 |
| Buctopstown | Frederick | 21717 |
| Burkittsville | Frederick | 21718 |
| Burtonsville | Montgomery | ***** |
| Bushwood | Saint Mary's | 20618 |
| Butler | Baltimore | 21023 |
| Bynum | Harford | 21050 |
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