Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Bethesda Fire Station Company 20 | Building | 112 | Montgomery | 39 00 14 N | 077 06 36 W |
| Bethesda Fire Station Company 26 | Building | 94 | Montgomery | 39 01 17 N | 077 08 47 W |
| Bethesda Fire Station Company 6 | Building | 104 | Montgomery | 38 58 36 N | 077 05 29 W |
| Bethesda Library | Building | 99 | Montgomery | 38 59 00 N | 077 05 55 W |
| Bethesda Police Department District 2 | Building | | Montgomery | 39 38 33 N | 077 09 36 W |
| Bethesda Regional Library | Building | 100 | Montgomery | 38 59 00 N | 077 05 56 W |
| Bethesda-Chevy Chase Rescue Fire Station Company 1 | Building | 107 | Montgomery | 38 59 24 N | 077 06 10 W |
| Betterton Town Hall | Building | 18 | Kent | 39 22 05 N | 076 03 36 W |
| Betterton Volunteer Fire Company Kent County Station 5 | Building | | Kent | 39 36 31 N | 076 06 39 W |
| Bishopville Volunteer Fire Department Station 900 | Building | | Worcester | 38 44 43 N | 075 19 30 W |
| Bittinger Volunteer Fire Department | Building | 814 | Garrett | 39 36 01 N | 079 13 16 W |
| Bjorlee Library | Building | 98 | Frederick | 39 24 31 N | 077 24 34 W |
| Blackwater National Wildlife Refuge Center | Building | 0 | Dorchester | 38 26 41 N | 076 07 10 W |
| Blackwell Library | Building | 9 | Wicomico | 38 20 48 N | 075 36 24 W |
| Bladensburg Branch Library | Building | 10 | Prince George's | 38 56 21 N | 076 56 08 W |
| Bladensburg Branch Prince George's County Memorial Library | Building | 14 | Prince George's | 38 56 23 N | 076 56 04 W |
| Bladensburg Police Department | Building | | Prince George's | 39 34 23 N | 077 33 27 W |
| Bladensburg Volunteer Fire Department and Rescue Squad Company 9 | Building | | Prince George's | 39 34 17 N | 077 33 35 W |
| Bloomington Volunteer Fire Department | Building | 322 | Garrett | 39 28 44 N | 079 04 17 W |
| Boonsboro Ambulance and Rescue, Company 69 | Building | | Washington | 39 52 41 N | 078 06 25 W |
| Boonsboro Free Library | Building | 167 | Washington | 39 30 24 N | 077 39 08 W |
| Boonsboro Museum of History | Building | 165 | Washington | 39 30 29 N | 077 39 09 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 |
| Borden Shaft Volunteer Fire Department | Building | | Allegany | 40 03 13 N | 079 34 10 W |
| Borders Learning Center | Building | 187 | Frederick | 39 40 58 N | 077 21 10 W |
| Boulevard Heights Volunteer Fire Department Company 17 | Building | | Prince George's | 39 27 18 N | 077 34 07 W |
| Bowie Branch Prince George's County Memorial Library | Building | 35 | Prince George's | 38 58 40 N | 076 44 30 W |
| Bowie City Hall | Building | 47 | Prince George's | 38 57 38 N | 076 44 30 W |
| Bowie Library | Building | 32 | Prince George's | 38 58 40 N | 076 44 25 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 |
| Bowleys Quarters Volunteer Fire Department Station 21 | Building | | Baltimore | 39 19 15 N | 076 23 34 W |
| Bowling Green Volunteer Fire Department | Building | | Allegany | 40 03 06 N | 079 21 00 W |
| Bowman's Addition Volunteer Fire Company | Building | | Allegany | 40 09 02 N | 079 15 03 W |
| Boy Scouts of America Headquarters | Building | 74 | Montgomery | 39 00 23 N | 077 05 54 W |
| Boyds Railroad Station | Building | 128 | Montgomery | 39 11 02 N | 077 18 47 W |
| Braddock Heights Fire Company Number 12 | Building | | Frederick | 39 42 20 N | 077 50 51 W |
| Braddock House | Building | | Allegany | 39 38 55 N | 078 55 51 W |
| Brady Health Center | Building | | Allegany | 39 39 03 N | 078 55 49 W |
| Branchville Volunteer Fire Company Compant 11 | Building | | Prince George's | 39 40 30 N | 077 33 05 W |
| Brandywine Volunteer Fire Department Company 40 | Building | | Prince George's | 39 10 06 N | 077 24 26 W |
| Braodway Branch Enoch Pratt Free Library | Building | 26 | Baltimore (city) | 39 17 41 N | 076 35 38 W |
| Brice House | Building | | Anne Arundel | 38 58 45 N | 076 29 14 W |
| Broad Neck Branch Library | Building | 25 | Anne Arundel | 39 02 15 N | 076 27 18 W |
| Brodbeck Music Hall | Building | | Frederick | 39 42 15 N | 077 42 10 W |
| Brooke Grove Health Center | Building | 145 | Montgomery | 39 09 23 N | 077 02 29 W |
| Brooklandville Fire Department Station 14 | Building | | Baltimore | 39 23 59 N | 076 39 57 W |
| Brooklyn Branch Enoch Pratt Free Library | Building | 21 | Baltimore (city) | 39 14 16 N | 076 36 23 W |
| Brooklyn Community Fire Company 31 | Building | | Anne Arundel | 39 13 26 N | 076 36 52 W |
| Brooklyn Park Branch Library | Building | 32 | Anne Arundel | 39 13 25 N | 076 36 41 W |
| Brunswick Branch Frederick County Library | Building | 127 | Frederick | 39 19 16 N | 077 37 25 W |
| Brunswick Branch Library | Building | 129 | Frederick | 39 19 14 N | 077 37 26 W |
| Brunswick Fire Company Number 5 | Building | | Frederick | 39 31 33 N | 078 03 38 W |
| Brunswick Museum | Building | 90 | Frederick | 39 18 49 N | 077 37 49 W |
| Brunswick Town Hall | Building | 85 | Frederick | 39 18 46 N | 077 37 34 W |
| Brunswick Town of Police Department | Building | | Frederick | 39 31 32 N | 078 03 03 W |
| Brunswick Volunteer Ambulance Company Number 19 | Building | | Frederick | 39 31 34 N | 078 03 36 W |
| Bryans Road Branch Charles County Public Library | Building | 54 | Charles | 38 37 48 N | 077 04 34 W |
| Bryans Road Volunteer Fire Department and Rescue Squad Station 11 | Building | | Charles | 39 02 45 N | 077 07 41 W |
| Buck Bacchus Store Museum | Building | 6 | Kent | 39 12 28 N | 076 03 56 W |
| Bunker Hill Volunteer Fire and Rescue Company | Building | | Prince George's | 39 34 22 N | 077 36 14 W |
| Burdick Hall | Building | 113 | Baltimore | 39 23 43 N | 076 36 45 W |
| Burtonsville Volunteer Fire Department Fire Station 15 | Building | | Montgomery | 39 08 51 N | 077 35 13 W |
| Bushwood Lodge (historical) | Building | 32 | St. Mary's | 38 18 47 N | 076 45 56 W |
| Bushwood Manor House (historical) | Building | 39 | St. Mary's | 38 17 53 N | 076 47 34 W |
| Butler Volunteer Fire Company Station 49 | Building | | Baltimore | 39 54 06 N | 077 13 24 W |
| C Burr Artz Public Library | Building | 86 | Frederick | 39 24 50 N | 077 24 32 W |
| Cabin John Fire Station Company 10 | Building | 48 | Montgomery | 38 59 34 N | 077 09 41 W |
| Cabin John Fire Station Company 30 | Building | 104 | Montgomery | 39 00 35 N | 077 13 13 W |
| Calloway Hall | Building | 72 | Baltimore (city) | 39 20 49 N | 076 34 57 W |
| Calvert Advanced Life Support Company 10 | Building | | Calvert | 38 56 17 N | 077 00 32 W |
| Calvert County Courthouse | Building | 43 | Calvert | 38 32 18 N | 076 35 03 W |
| Calvert County Fire/Rescue/Emergency Medical Services Division | Building | | Calvert | 38 54 32 N | 076 58 32 W |
| Calvert County Historical Society | Building | 45 | Calvert | 38 32 12 N | 076 35 08 W |
| Calvert County Jail | Building | 43 | Calvert | 38 32 12 N | 076 36 55 W |
| Calvert County Public Library | Building | 45 | Calvert | 38 32 10 N | 076 35 09 W |
| Calvert County Sheriff's Office | Building | | Calvert | 38 54 21 N | 076 59 12 W |
| Calvert House | Building | 48 | Calvert | 38 32 19 N | 076 35 15 W |
| Calvert Marine Museum | Building | 1 | Calvert | 38 19 52 N | 076 27 52 W |
| Calvert Pines Senior Center | Building | 45 | Calvert | 38 32 40 N | 076 35 43 W |
| Cambridge City Hall | Building | 5 | Dorchester | 38 34 15 N | 076 04 35 W |
| Cambridge House Nursing Home | Building | 5 | Dorchester | 38 34 28 N | 076 05 14 W |
| Cambridge Police Department | Building | | Dorchester | 38 57 36 N | 076 07 55 W |
| Cambridge Residence Hall | Building | 585 | Allegany | 39 39 05 N | 078 56 14 W |
| Canton Branch Enoch Pratt Free Library | Building | 12 | Baltimore (city) | 39 16 48 N | 076 34 23 W |
| Cape Saint Claire Fire Company 19 | Building | | Anne Arundel | 39 02 05 N | 076 26 24 W |
| Cape Saint Claire Volunteer Fire Company 19 | Building | | Anne Arundel | 39 03 55 N | 076 44 39 W |
| Capital Bible Seminary | Building | | Prince George's | 38 58 48 N | 076 51 52 W |
| Capitol Heights Police Department | Building | | Prince George's | 39 28 45 N | 077 31 39 W |
| Capitol Heights Vokunteer Fire Department | Building | | Prince George's | 39 28 45 N | 077 31 19 W |
| Capitol Heights Volunteer Fire Department | Building | | Prince George's | 39 28 45 N | 077 31 19 W |
| Carnegie Hall | Building | 74 | Baltimore (city) | 39 20 48 N | 076 34 58 W |
| Caroline College Center | Building | | Queen Anne's | 38 57 09 N | 076 05 01 W |
| Caroline County Courthouse | Building | 7 | Caroline | 38 53 12 N | 075 49 60 W |
| Caroline County Sheriffs Department | Building | | Caroline | 39 29 17 N | 076 23 35 W |
| Caroline Public Library | Building | 7 | Caroline | 38 53 11 N | 075 50 02 W |
| Carroll County Courthouse | Building | 244 | Carroll | 39 34 15 N | 076 59 19 W |
| Carroll County Farm Museum | Building | 231 | Carroll | 39 33 27 N | 076 59 44 W |
| Carroll County Public Library | Building | 236 | Carroll | 39 34 26 N | 076 59 42 W |
| Carroll Manor Fire Company Number 14 | Building | | Frederick | 39 31 31 N | 077 47 41 W |
| Carroll Mansion | Building | 5 | Baltimore (city) | 39 17 19 N | 076 36 15 W |
| Carson Cottage | Building | | Frederick | 39 42 16 N | 077 42 19 W |
| Caruthers Hall | Building | 9 | Wicomico | 38 20 46 N | 075 36 18 W |
| Casey Community Center | Building | 150 | Montgomery | 39 07 26 N | 077 10 54 W |
| Catonsville Area Branch Baltimore County Public Library | Building | 157 | Baltimore | 39 16 13 N | 076 44 26 W |
| Catonsville Fire Department Station 4 | Building | | Baltimore | 39 16 19 N | 076 44 01 W |
| Cecil Community Center | Building | 140 | Cecil | 39 41 20 N | 076 02 21 W |
| Cecil County Courthouse | Building | 9 | Cecil | 39 36 30 N | 075 49 44 W |