Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Boonsboro | Populated Place | 18 | Caroline | 38 57 00 N | 075 51 36 W |
| Boonsboro | Populated Place | 166 | Washington | 39 30 22 N | 077 39 09 W |
| Boonsboro Ambulance and Rescue, Company 69 | Building | | Washington | 39 52 41 N | 078 06 25 W |
| Boonsboro Cemetery | Cemetery | 173 | Washington | 39 30 12 N | 077 39 12 W |
| Boonsboro Elementary School | School | 172 | Washington | 39 30 47 N | 077 39 14 W |
| Boonsboro Free Library | Building | 167 | Washington | 39 30 24 N | 077 39 08 W |
| Boonsboro High School | School | 180 | Washington | 39 30 58 N | 077 39 06 W |
| Boonsboro Middle School | School | 178 | Washington | 39 30 49 N | 077 39 04 W |
| Boonsboro Museum of History | Building | 165 | Washington | 39 30 29 N | 077 39 09 W |
| Boonsboro Post Office | Post Office | 163 | Washington | 39 30 23 N | 077 39 11 W |
| Boonsboro Reservoir | Reservoir | 248 | Washington | 39 30 25 N | 077 37 50 W |
| Boonsboro Town Hall | Building | 175 | Washington | 39 30 26 N | 077 39 02 W |
| Boonsboro Volunteer Fire Department Substation Company 8 | Building | | Washington | 39 41 24 N | 078 06 09 W |
| Boordy Vineyards | Populated Place | 97 | Baltimore | 39 28 33 N | 076 29 11 W |
| Boot Hill | Populated Place | 74 | Cecil | 39 39 52 N | 075 51 08 W |
| Boot Hill Cemetery | Cemetery | 76 | Cecil | 39 39 52 N | 075 51 02 W |
| Boot Pond | Lake | 14 | Anne Arundel | 38 53 38 N | 076 34 37 W |
| Boothby Hill | Summit | 19 | Harford | 39 28 55 N | 076 09 47 W |
| Bootjack | Populated Place | 188 | Montgomery | 39 16 26 N | 077 09 20 W |
| Bootjack Spring | Spring | 418 | Frederick | 39 28 22 N | 077 29 28 W |
| Bootjack Springs Estates | Populated Place | 180 | Frederick | 39 27 55 N | 077 27 56 W |
| Booze Creek | Stream | | Montgomery | 38 58 53 N | 077 09 26 W |
| Borden Shaft | Populated Place | 547 | Allegany | 39 37 37 N | 078 56 12 W |
| Borden Shaft Volunteer Fire Department | Building | | Allegany | 40 03 13 N | 079 34 10 W |
| Borden Tunnel | Tunnel | 648 | Allegany | 39 41 19 N | 078 55 08 W |
| Borders Learning Center | Building | 187 | Frederick | 39 40 58 N | 077 21 10 W |
| Bordley Point | Cape | 3 | Queen Anne's | 38 51 53 N | 076 11 10 W |
| Boring | Populated Place | 213 | Baltimore | 39 31 54 N | 076 49 22 W |
| Boring Post Office | Post Office | 215 | Baltimore | 39 31 52 N | 076 49 21 W |
| Boring United Methodist Church | Church | 212 | Baltimore | 39 31 59 N | 076 49 26 W |
| Bosley (historical) | Populated Place | 72 | Baltimore | 39 27 02 N | 076 34 29 W |
| Bosley Church | Church | 129 | Baltimore | 39 31 40 N | 076 40 27 W |
| Boss Arnold Village | Populated Place | 129 | Frederick | 39 19 40 N | 077 34 36 W |
| Bostetter | Populated Place | 186 | Washington | 39 39 52 N | 077 45 13 W |
| Bosuns Bluff Marsh | Swamp | 5 | Anne Arundel | 38 52 49 N | 076 31 48 W |
| Botelars Landing (historical) | Locale | 0 | Calvert | 38 25 21 N | 076 34 01 W |
| Bottom Road Racetrack | Locale | 93 | Baltimore | 39 28 30 N | 076 27 55 W |
| Boulden Chapel | Church | 54 | Cecil | 39 37 32 N | 075 54 03 W |
| Boulden Chapel Cemetery | Cemetery | 53 | Cecil | 39 37 33 N | 075 54 03 W |
| Boulevard Corporate Center | Locale | | Baltimore | 39 25 31 N | 076 46 44 W |
| Boulevard Heights | Populated Place | 70 | Prince George's | 38 52 11 N | 076 56 00 W |
| Boulevard Heights Volunteer Fire Department Company 17 | Building | | Prince George's | 39 27 18 N | 077 34 07 W |
| Boulevard Park | Populated Place | 12 | Anne Arundel | 39 06 05 N | 076 28 39 W |
| Boundary Avenue Methodist Episcopal Church (historical) | Church | 97 | Baltimore (city) | 39 20 23 N | 076 36 32 W |
| Boundary Stone Point | Cape | 2 | Anne Arundel | 39 05 23 N | 076 31 34 W |
| Bounder Pond | Lake | 2 | Worcester | 38 26 21 N | 075 06 33 W |
| Bountys View | Populated Place | 46 | Anne Arundel | 38 47 52 N | 076 35 41 W |
| Bow Cove | Bay | 7 | Calvert | 38 19 45 N | 076 26 56 W |
| Bow Knee Point | Cape | -5 | Talbot | 38 40 25 N | 075 57 08 W |
| Bowdoin Point | Cape | 1 | Anne Arundel | 38 59 43 N | 076 26 49 W |
| Bowen Country | Populated Place | 29 | Calvert | 38 35 07 N | 076 37 03 W |
| Bowen Estates | Populated Place | 56 | Charles | 38 35 44 N | 076 45 24 W |
| Bowens | Populated Place | 43 | Calvert | 38 29 43 N | 076 37 20 W |
| Bowens Branch | Stream | | Worcester | 38 18 04 N | 075 18 41 W |
| Bowens Chapel | Church | 179 | Carroll | 39 35 25 N | 077 08 35 W |
| Bowens Farm Pond Dam | Dam | 21 | Calvert | 38 30 18 N | 076 36 53 W |
| Bower Field | Airport | 27 | Prince George's | 38 44 12 N | 077 01 18 W |
| Bowercrest Park | Populated Place | 200 | Carroll | 39 30 47 N | 077 04 22 W |
| Bowie | Populated Place | 47 | Prince George's | 39 00 24 N | 076 46 45 W |
| Bowie Branch Prince George's County Memorial Library | Building | 35 | Prince George's | 38 58 40 N | 076 44 30 W |
| Bowie Cemetery | Cemetery | 55 | Prince George's | 38 57 07 N | 076 46 54 W |
| Bowie City Hall | Building | 47 | Prince George's | 38 57 38 N | 076 44 30 W |
| Bowie Health Center | Hospital | 43 | Prince George's | 38 56 57 N | 076 44 43 W |
| Bowie Library | Building | 32 | Prince George's | 38 58 40 N | 076 44 25 W |
| Bowie Mill Estates | Populated Place | 141 | Montgomery | 39 08 31 N | 077 06 54 W |
| Bowie Mill Park | Park | 141 | Montgomery | 39 08 25 N | 077 07 05 W |
| Bowie Mill Park | Populated Place | 137 | Montgomery | 39 08 21 N | 077 07 16 W |
| Bowie Race Track | Locale | 33 | Prince George's | 39 00 20 N | 076 44 21 W |
| Bowie Race-Track Stables | Locale | 33 | Prince George's | 38 59 56 N | 076 44 40 W |
| Bowie Senior High School | School | 38 | Prince George's | 38 58 42 N | 076 44 37 W |
| Bowie State University | School | 37 | Prince George's | 39 01 10 N | 076 45 38 W |
| Bowie Station Methodist Episcopal Church (historical) | Church | 54 | Prince George's | 39 00 17 N | 076 46 42 W |
| Bowie Volunteer Fire Department and Rescue Squad | Building | | Prince George's | 39 38 35 N | 077 14 02 W |
| Bowie Volunteer Fire Department and Rescue Squad Company 19 | Building | | Prince George's | 39 01 25 N | 077 18 08 W |
| Bowie Volunteer Fire Department and Rescue Squad Company 43 | Building | | Prince George's | 39 31 39 N | 077 12 03 W |
| Bowley Bar | Cape | 2 | Baltimore | 39 18 00 N | 076 22 59 W |
| Bowley Point | Cape | 0 | Baltimore | 39 17 54 N | 076 23 02 W |
| Bowleys Quarters | Populated Place | 14 | Baltimore | 39 20 07 N | 076 23 25 W |
| Bowleys Quarters Volunteer Fire Department Station 21 | Building | | Baltimore | 39 19 15 N | 076 23 34 W |
| Bowleys Yacht Basin | Harbor | 0 | Baltimore | 39 18 02 N | 076 23 09 W |
| Bowling Creek | Stream | | Charles | 38 25 38 N | 076 56 34 W |
| Bowling Green | Populated Place | 202 | Allegany | 39 37 25 N | 078 48 16 W |
| Bowling Green Volunteer Fire Department | Building | | Allegany | 40 03 06 N | 079 21 00 W |
| Bowling Gut | Stream | | Charles | 38 23 16 N | 076 53 16 W |
| Bowling Landing | Populated Place | 5 | Prince George's | 38 41 05 N | 076 42 06 W |
| Bowlings Alley | Locale | 49 | Charles | 38 26 26 N | 076 55 06 W |
| Bowman Creek | Stream | | Charles | 38 27 54 N | 076 56 05 W |
| Bowman's Addition Volunteer Fire Company | Building | | Allegany | 40 09 02 N | 079 15 03 W |
| Bowmans Addition | Populated Place | 262 | Allegany | 39 41 30 N | 078 44 54 W |
| Bowmans Mill | Populated Place | 182 | Washington | 39 41 04 N | 077 36 52 W |
| Bowmans Plains Industrial Park | Locale | 85 | Frederick | 39 21 40 N | 077 25 53 W |
| Bowser Chapel (historical) | Church | 19 | Queen Anne's | 38 57 18 N | 076 07 41 W |
| Box Hill North | Populated Place | 61 | Harford | 39 28 45 N | 076 18 18 W |
| Box Hill South | Populated Place | 43 | Harford | 39 28 05 N | 076 17 49 W |
| Box Hill Square Shopping Center | Locale | 70 | Harford | 39 28 44 N | 076 18 34 W |
| Boxer Hill Park | Populated Place | 178 | Baltimore | 39 27 25 N | 076 40 59 W |
| Boxes Point | Cape | -2 | Kent | 39 03 03 N | 076 12 44 W |
| Boxes Point Trail | Trail | 3 | Kent | 39 02 47 N | 076 12 58 W |
| Boxiron | Populated Place | 5 | Worcester | 38 06 54 N | 075 20 57 W |
| Boxiron Creek | Stream | | Worcester | 38 06 21 N | 075 20 02 W |
| Boxiron Landing | Populated Place | -3 | Worcester | 38 05 54 N | 075 20 16 W |
| Boxiron Pond (historical) | Reservoir | 0 | Worcester | 38 06 56 N | 075 20 44 W |
| Boxwood | Populated Place | 108 | Baltimore | 39 25 22 N | 076 39 19 W |
| Boxwood Village | Populated Place | 42 | Prince George's | 39 00 35 N | 076 53 19 W |
| Boy Scouts of America Headquarters | Building | 74 | Montgomery | 39 00 23 N | 077 05 54 W |
| Boyd Farm Pond Dam | Dam | 12 | Talbot | 38 55 00 N | 076 04 29 W |
| Boyd Mountain | Summit | 302 | Washington | 39 38 53 N | 077 57 25 W |
| Boyd Point | Cape | 6 | Anne Arundel | 38 57 20 N | 076 34 01 W |
| Boyd Pond | Lake | 0 | Anne Arundel | 39 08 23 N | 076 27 06 W |
| Boyds | Populated Place | 129 | Montgomery | 39 11 01 N | 077 18 46 W |