Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Allentown Road Volunteer Fire Department Company 47 | Building | | Prince George's | 39 14 24 N | 077 39 41 W |
| Alumanae House | Building | | Frederick | 39 42 03 N | 077 42 23 W |
| Alumanas House - Hood College | Building | | Frederick | 39 42 20 N | 077 42 31 W |
| Alumni Hall | Building | 2 | Anne Arundel | 38 59 03 N | 076 29 16 W |
| Alumni House | Building | 9 | Anne Arundel | 38 58 53 N | 076 29 22 W |
| American Red Cross | Building | 73 | Montgomery | 38 59 39 N | 077 02 42 W |
| American Visionary Art Museum | Building | | Baltimore (city) | 39 16 50 N | 076 36 24 W |
| Annapolis Branch Public Library of Annapolis and Anne Arundel County | Building | 15 | Anne Arundel | 38 58 43 N | 076 30 59 W |
| Annapolis City Hall | Building | | Anne Arundel | 38 58 35 N | 076 29 22 W |
| Annapolis City Hall Annex | Building | | Anne Arundel | 38 58 35 N | 076 29 24 W |
| Annapolis Fire Company 35 | Building | | Anne Arundel | 38 58 17 N | 076 31 21 W |
| Annapolis Opera House (historical) | Building | 6 | Anne Arundel | 38 58 50 N | 076 29 18 W |
| Annapolis Police Department | Building | | Anne Arundel | 39 38 30 N | 076 51 04 W |
| Annapolis Residence Hall | Building | 590 | Allegany | 39 39 07 N | 078 56 06 W |
| Annapolis Summer Garden Theater | Building | | Anne Arundel | 38 58 36 N | 076 29 15 W |
| Anne Arundel County Courthouse | Building | 10 | Anne Arundel | 38 58 38 N | 076 29 36 W |
| Anne Arundel County Detention Center | Building | 20 | Anne Arundel | 38 59 21 N | 076 31 46 W |
| Anne Arundel County Fire Department | Building | | Anne Arundel | 39 13 16 N | 076 56 21 W |
| Anne Arundel County Fire Department 31 | Building | | Anne Arundel | 39 22 39 N | 077 01 40 W |
| Anne Arundel County Police | Building | | Anne Arundel | 39 10 29 N | 077 03 06 W |
| Anne Arundel Police Department Eastern District | Building | | Anne Arundel | 39 12 39 N | 076 53 07 W |
| Anne Arundel Police Department Northern District | Building | | Anne Arundel | 39 21 32 N | 077 04 34 W |
| Anne Arundel Police Department Southern District | Building | | Anne Arundel | 39 32 58 N | 076 57 02 W |
| Anne Arundel Police Department Western District | Building | | Anne Arundel | 39 10 03 N | 077 09 49 W |
| Antietam Professional Center | Building | 164 | Washington | 39 38 21 N | 077 43 03 W |
| Apple Resource Center | Building | | Frederick | 39 42 15 N | 077 42 37 W |
| Arbutus Branch Baltimore County Public Library | Building | 30 | Baltimore | 39 14 58 N | 076 41 19 W |
| Arbutus Volunteer Fire Department Station 35 | Building | | Baltimore | 39 15 01 N | 076 41 31 W |
| Arcadia Volunteer Fire Company Station 43 | Building | | Baltimore | 39 56 35 N | 077 23 56 W |
| Area 1 School Administration Center | Building | 114 | Montgomery | 39 02 31 N | 077 06 48 W |
| Area 3 School Administration Center | Building | 145 | Montgomery | 39 10 40 N | 077 16 08 W |
| Argyle Community Building | Building | 101 | Montgomery | 39 01 05 N | 077 01 41 W |
| Arlington Federal Building | Building | 22 | Baltimore (city) | 39 17 32 N | 076 36 54 W |
| Armiger Fire Company 30 | Building | | Anne Arundel | 39 07 55 N | 076 33 47 W |
| Arnold Fire Company 17 | Building | | Anne Arundel | 39 01 43 N | 076 30 12 W |
| Arnold Senior Citizens Center | Building | 37 | Anne Arundel | 39 01 52 N | 076 30 14 W |
| Arnold Volunteer Fire Department | Building | | Anne Arundel | 39 03 23 N | 076 50 32 W |
| Arundel Fire Company 7 | Building | | Anne Arundel | 38 59 21 N | 076 40 14 W |
| Arundel Volunteer Fire Department | Building | | Baltimore (city) | 39 39 30 N | 077 07 01 W |
| Arundel Volunteer Fire Department Company 7 | Building | | Anne Arundel | 39 39 30 N | 077 07 00 W |
| Asbury Home | Building | 154 | Montgomery | 39 08 47 N | 077 11 50 W |
| Ashburton Filtration Plant | Building | 112 | Baltimore (city) | 39 19 21 N | 076 39 41 W |
| Aspen Hill Library | Building | 112 | Montgomery | 39 04 45 N | 077 05 17 W |
| Augsburg Home | Building | 141 | Baltimore | 39 20 55 N | 076 43 29 W |
| Back River Neck Fire Department Station 58 | Building | | Baltimore | 39 17 08 N | 076 25 37 W |
| Bacon House | Building | | Baltimore | 39 24 21 N | 076 35 33 W |
| Baden Branch Library | Building | 61 | Prince George's | 38 39 38 N | 076 46 18 W |
| Baden Branch Prince George's County Memorial Library | Building | 63 | Prince George's | 38 39 43 N | 076 46 13 W |
| Baden Volunteer Fire Department Company 36 | Building | | Prince George's | 39 06 09 N | 077 18 30 W |
| Baltimore and Ohio Railroad Museum | Building | 20 | Baltimore (city) | 39 17 07 N | 076 37 58 W |
| Baltimore Arena | Building | 14 | Baltimore (city) | 39 17 18 N | 076 37 07 W |
| Baltimore City Courthouse | Building | 12 | Baltimore (city) | 39 17 26 N | 076 36 47 W |
| Baltimore City Detention Center | Building | | Baltimore (city) | 39 17 55 N | 076 36 33 W |
| Baltimore City Fire Department | Building | | Baltimore (city) | 39 29 48 N | 077 01 27 W |
| Baltimore City Hall | Building | 6 | Baltimore (city) | 39 17 27 N | 076 36 38 W |
| Baltimore City Police Department | Building | | Anne Arundel | 39 32 25 N | 077 02 14 W |
| Baltimore Civil War Museum | Building | | Baltimore (city) | 39 17 01 N | 076 36 09 W |
| Baltimore County Courthouse | Building | 141 | Baltimore | 39 24 01 N | 076 36 24 W |
| Baltimore County Fire Station Number Six | Building | 31 | Baltimore | 39 14 05 N | 076 41 12 W |
| Baltimore County Health Center (historical) | Building | 13 | Baltimore | 39 18 42 N | 076 28 23 W |
| Baltimore County Jail | Building | 129 | Baltimore | 39 23 52 N | 076 36 29 W |
| Baltimore County Police Department Precinct 01 Wilkens | Building | | Baltimore | 39 26 38 N | 077 12 02 W |
| Baltimore County Police Department Precinct 02 Woodlawn | Building | | Baltimore | 39 32 21 N | 077 13 05 W |
| Baltimore County Police Department Precinct 06 Towson | Building | | Baltimore | 39 40 30 N | 077 01 09 W |
| Baltimore County Police Department Precinct 07 Cockeysville | Building | | Baltimore | 39 49 24 N | 077 05 37 W |
| Baltimore County Police Department Precinct 08 Parkville | Building | | Baltimore | 39 39 23 N | 076 54 43 W |
| Baltimore County Police Department Precinct 09 White Marsh | Building | | Baltimore | 39 38 00 N | 076 47 31 W |
| Baltimore County Police Department Precinct 11 Essex | Building | | Baltimore | 39 32 05 N | 076 47 11 W |
| Baltimore County Police Department Precinct 12 North Point | Building | | Baltimore | 39 27 28 N | 076 50 18 W |
| Baltimore Maritime Museum | Building | 1 | Baltimore (city) | 39 17 10 N | 076 36 30 W |
| Baltimore Museum of Art | Building | 60 | Baltimore (city) | 39 19 33 N | 076 37 09 W |
| Baltimore Museum of Industry | Building | 1 | Baltimore (city) | 39 16 27 N | 076 36 07 W |
| Baltimore Pike Volunteer Fire Company | Building | | Allegany | 40 07 58 N | 079 08 52 W |
| Baltimore Public Works Museum | Building | 2 | Baltimore (city) | 39 17 05 N | 076 36 12 W |
| Baltimore Streetcar Museum | Building | 23 | Baltimore (city) | 39 18 49 N | 076 37 25 W |
| Bancroft Hall | Building | 4 | Anne Arundel | 38 58 53 N | 076 28 58 W |
| Bannaeker Hall | Building | 74 | Baltimore (city) | 39 20 42 N | 076 35 04 W |
| Bannaker Fire Station | Building | 121 | Howard | 39 12 46 N | 076 52 10 W |
| Banneker-Douglass Museum of Afro-American Life and History | Building | 10 | Anne Arundel | 38 58 38 N | 076 29 38 W |
| Bannister Neighborhood Center | Building | 58 | Charles | 38 35 35 N | 076 54 11 W |
| Baptist Home of Maryland | Building | 165 | Baltimore | 39 25 07 N | 076 43 38 W |
| Barbara Fritchie House and Museum | Building | 86 | Frederick | 39 24 51 N | 077 24 50 W |
| Barclay Town Hall | Building | 21 | Queen Anne's | 39 08 39 N | 075 51 51 W |
| Barr-Buchanan Center | Building | | Anne Arundel | 38 58 55 N | 076 29 24 W |
| Barrett Hall | Building | 213 | Frederick | 39 40 56 N | 077 21 18 W |
| Barton Hose Company Number 1 | Building | | Allegany | 39 54 15 N | 079 01 46 W |
| Battle Creek Cypress Swamp Nature Center | Building | 11 | Calvert | 38 29 24 N | 076 35 29 W |
| Bay District Volunteer Fire Company 3 | Building | | St. Mary's | 38 26 53 N | 076 45 29 W |
| Bay District Volunteer Fire Company 9 | Building | | St. Mary's | 38 29 16 N | 076 49 29 W |
| Bel Air Armory | Building | 120 | Harford | 39 32 17 N | 076 20 59 W |
| Bel Air Branch Harford County Library | Building | 122 | Harford | 39 32 17 N | 076 21 04 W |
| Bel Air Police Department | Building | | Harford | 39 54 25 N | 076 35 24 W |
| Bel Air Volunteer Fire Company | Building | | Harford | 39 54 04 N | 076 35 10 W |
| Bel Alton Compary Fire Station | Building | 53 | Charles | 38 27 44 N | 076 59 15 W |
| Bellavance Honors Center | Building | 8 | Wicomico | 38 20 49 N | 075 36 31 W |
| Belmont Research Conference Center | Building | 101 | Howard | 39 13 35 N | 076 44 39 W |
| Beltsville Branch Library | Building | 60 | Prince George's | 39 02 07 N | 076 55 08 W |
| Beltsville Branch Prince George's County Memorial Library | Building | 66 | Prince George's | 39 02 04 N | 076 55 14 W |
| Beltsville Volunteer Fire Department Company 31 | Building | | Prince George's | 39 04 27 N | 077 31 29 W |
| Beltsville Volunteer Fire Department Company 41 | Building | | Prince George's | 39 05 03 N | 077 34 18 W |
| Benedict Volunteer Fire Department and Rescue Squad Station 5 | Building | | Charles | 38 51 21 N | 077 08 28 W |
| Beneficial Hodson Library | Building | | Frederick | 39 42 06 N | 077 42 30 W |
| Bennett House | Building | | Baltimore | 39 24 27 N | 076 35 30 W |
| Berlin Branch Library | Building | 13 | Worcester | 38 19 45 N | 075 13 15 W |
| Berlin Town Hall | Building | 13 | Worcester | 38 19 28 N | 075 13 08 W |
| Berlin Volunteer Fire Company Station 600 | Building | | Worcester | 38 33 26 N | 075 22 08 W |
| Berwyn Heights Police Department | Building | | Prince George's | 39 39 39 N | 077 32 15 W |
| Berwyn Heights Volunteer Fire Department | Building | | Prince George's | 39 39 57 N | 077 31 14 W |
| Bethany Fire Station | Building | 128 | Howard | 39 17 49 N | 076 52 50 W |
| Bethesda Annex Police Station | Building | 107 | Montgomery | 38 59 00 N | 077 05 36 W |