Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Allegheny Heights | Summit | 972 | Garrett | 39 19 58 N | 079 22 45 W |
| Allen | Populated Place | 3 | Wicomico | 38 17 14 N | 075 41 17 W |
| Allen African Methodist Episcopal Church | Church | 28 | Baltimore (city) | 39 17 28 N | 076 38 11 W |
| Allen Cemetery | Cemetery | 6 | Wicomico | 38 17 24 N | 075 41 24 W |
| Allen Methodist Church | Church | 6 | Wicomico | 38 17 27 N | 075 41 27 W |
| Allen Pond | Reservoir | 36 | Prince George's | 38 55 57 N | 076 44 32 W |
| Allen Pond Dam | Dam | 36 | Prince George's | 38 55 57 N | 076 44 32 W |
| Allen Pond Park | Park | 38 | Prince George's | 38 56 05 N | 076 44 11 W |
| Allen Post Office | Post Office | 7 | Wicomico | 38 17 30 N | 075 41 25 W |
| Allen Residence Hall | Building | 603 | Allegany | 39 39 04 N | 078 55 50 W |
| Allendale Estates | Populated Place | 78 | Harford | 39 34 52 N | 076 15 08 W |
| Allender Road Pit | Mine | 24 | Baltimore | 39 23 30 N | 076 23 30 W |
| Allenford | Populated Place | 139 | Howard | 39 18 39 N | 076 51 38 W |
| Allens Fresh | Populated Place | 6 | Charles | 38 24 50 N | 076 56 26 W |
| Allens Fresh Run | Bay | -3 | Charles | 38 24 06 N | 076 55 36 W |
| Allentown Church | Church | 77 | Prince George's | 38 46 54 N | 076 56 44 W |
| Allentown Outlet Mall Shopping Center | Locale | 78 | Prince George's | 38 48 15 N | 076 54 13 W |
| Allentown Pond Dam | Dam | 1 | Wicomico | 38 17 00 N | 075 41 17 W |
| Allentown Road Recreation Center | Park | 82 | Prince George's | 38 47 20 N | 076 55 59 W |
| Allentown Road Volunteer Fire Department Company 32 | Building | | Prince George's | 39 17 35 N | 077 35 29 W |
| Allentown Road Volunteer Fire Department Company 47 | Building | | Prince George's | 39 14 24 N | 077 39 41 W |
| Allentown Way Shopping Center | Locale | 79 | Prince George's | 38 48 06 N | 076 54 25 W |
| Allenville | Populated Place | 12 | Anne Arundel | 39 03 37 N | 076 31 22 W |
| Allenwood Elementary School | School | 76 | Prince George's | 38 48 10 N | 076 55 49 W |
| Allibone (historical) | Populated Place | 64 | Harford | 39 36 58 N | 076 18 52 W |
| Allnut Farms Estates | Populated Place | 159 | Howard | 39 11 50 N | 076 58 08 W |
| Alloway | Populated Place | 15 | Anne Arundel | 39 08 27 N | 076 28 43 W |
| Alloway Creek | Stream | 109 | Carroll | 39 41 56 N | 077 12 53 W |
| Allview Country Club | Locale | 122 | Howard | 39 14 10 N | 076 50 40 W |
| Allview Estates | Populated Place | 102 | Howard | 39 11 39 N | 076 51 34 W |
| Allview Golf Course | Locale | 117 | Howard | 39 14 05 N | 076 50 43 W |
| Allwood | Populated Place | 29 | Anne Arundel | 39 10 48 N | 076 38 52 W |
| Allyson Gardens | Populated Place | 196 | Baltimore | 39 25 47 N | 076 47 18 W |
| Alma Meadows | Populated Place | 254 | Carroll | 39 35 11 N | 076 51 44 W |
| Almar Estates | Populated Place | 44 | Anne Arundel | 38 48 43 N | 076 35 59 W |
| Almond Valley | Populated Place | 175 | Carroll | 39 27 16 N | 076 55 34 W |
| Almshouse Creek | Bay | 1 | Anne Arundel | 38 56 32 N | 076 32 35 W |
| Alpha | Populated Place | 185 | Howard | 39 19 16 N | 076 55 40 W |
| Alpha and Omega Church | Church | 13 | Caroline | 38 43 34 N | 075 47 41 W |
| Alpha Ridge Community Park | Park | 162 | Howard | 39 19 11 N | 076 54 46 W |
| Alpine | Populated Place | 154 | Frederick | 39 24 47 N | 077 19 23 W |
| Alpine Beach | Locale | 3 | Anne Arundel | 39 08 37 N | 076 27 16 W |
| Alpine View | Populated Place | 280 | Frederick | 39 32 02 N | 077 34 14 W |
| Alta Vista | Populated Place | 92 | Montgomery | 39 00 32 N | 077 06 31 W |
| Alta Vista Elementary School (historical) | School | 107 | Montgomery | 39 00 42 N | 077 06 47 W |
| Alta Vista Terrace | Populated Place | 97 | Montgomery | 39 00 19 N | 077 07 14 W |
| Altamont | Populated Place | 802 | Garrett | 39 25 39 N | 079 16 55 W |
| Altamont Place | Populated Place | 17 | Cecil | 39 36 10 N | 075 56 03 W |
| Alter Pond | Reservoir | 33 | Prince George's | 39 00 48 N | 076 51 04 W |
| Alto Vista | Populated Place | 271 | Carroll | 39 33 15 N | 076 59 25 W |
| Altogether (subdivision) | Populated Place | 189 | Frederick | 39 37 10 N | 077 25 24 W |
| Alton Homes (subdivision) | Populated Place | 54 | Harford | 39 31 09 N | 076 10 54 W |
| Altoona Beach | Populated Place | 12 | Anne Arundel | 39 09 33 N | 076 32 25 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 |
| Amanda Hills | Populated Place | 208 | Carroll | 39 36 00 N | 077 03 12 W |
| Amber Meadows | Populated Place | 109 | Frederick | 39 27 08 N | 077 24 29 W |
| Amber Meadows Park | Park | 39 | Prince George's | 38 54 41 N | 076 43 07 W |
| Amber Meadows Shopping Center | Locale | 102 | Frederick | 39 26 27 N | 077 24 34 W |
| Amber Woode | Populated Place | 38 | Calvert | 38 42 38 N | 076 35 23 W |
| Amberfield | Populated Place | 30 | Anne Arundel | 39 01 09 N | 076 41 34 W |
| Amberleigh Farms | Populated Place | 57 | Charles | 38 29 40 N | 076 52 08 W |
| Amberly | Populated Place | 7 | Anne Arundel | 39 01 00 N | 076 26 29 W |
| Amberly | Populated Place | 160 | Carroll | 39 22 26 N | 076 56 15 W |
| Ambrose Run | Stream | | Garrett | 39 20 46 N | 079 25 56 W |
| Amcelle | Populated Place | 201 | Allegany | 39 36 28 N | 078 48 55 W |
| Amcelle Acres | Populated Place | 268 | Allegany | 39 35 20 N | 078 50 57 W |
| Amelano Manor | Populated Place | 117 | Frederick | 39 28 31 N | 077 25 48 W |
| Amelia Church | Church | 132 | Baltimore | 39 23 58 N | 076 33 16 W |
| Amelung Estates | Populated Place | 129 | Frederick | 39 18 07 N | 077 24 15 W |
| American Chestnut Land Trust | Park | 25 | Calvert | 38 31 00 N | 076 31 24 W |
| American Cities Post Office | Post Office | 104 | Howard | 39 12 54 N | 076 51 23 W |
| American College of Cardiology | School | 113 | Montgomery | 39 00 21 N | 077 06 41 W |
| American Corner | Populated Place | 15 | Caroline | 38 46 02 N | 075 49 09 W |
| American Legion Memorial Bridge | Bridge | 15 | Montgomery | 38 58 12 N | 077 10 45 W |
| American Legion Park | Park | 5 | Dorchester | 38 34 17 N | 076 05 04 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 |
| Ames Cemetery | Cemetery | 14 | Caroline | 38 51 44 N | 075 47 18 W |
| Ames Church | Church | 118 | Harford | 39 31 59 N | 076 20 54 W |
| Ames Memorial United Methodist Church | Church | 60 | Baltimore (city) | 39 18 27 N | 076 38 28 W |
| Ames Methodist Church | Church | 155 | Baltimore | 39 22 35 N | 076 43 23 W |
| Ames Plaza Shopping Center | Locale | 25 | Harford | 39 31 43 N | 076 07 52 W |
| Ames Plaza Shopping Center | Locale | 11 | Wicomico | 38 23 30 N | 075 34 29 W |
| Ames Plaza Shopping Center | Locale | 7 | Worcester | 38 03 44 N | 075 32 55 W |
| Ames Shopping Center | Locale | 21 | Anne Arundel | 38 58 53 N | 076 32 09 W |
| Ames Shopping Center | Locale | 12 | Harford | 39 26 11 N | 076 18 59 W |
| Ames Shopping Center | Locale | 156 | Washington | 39 38 09 N | 077 42 33 W |
| Ames Shopping Center | Locale | 8 | Worcester | 38 20 22 N | 075 11 54 W |
| Ames United Methodist Church | Church | 14 | Caroline | 38 51 45 N | 075 47 19 W |
| Ammendale | Populated Place | 40 | Prince George's | 39 03 03 N | 076 53 48 W |
| Ammendale Business Campus | Locale | 48 | Prince George's | 39 03 24 N | 076 53 37 W |
| Ammendale Normal Institute | School | 55 | Prince George's | 39 03 11 N | 076 54 09 W |
| Amorine Branch | Stream | | Allegany | 39 42 52 N | 078 32 09 W |
| Amos Bar | Bar | 0 | Dorchester | 38 13 38 N | 076 03 02 W |
| Amos Falls | Falls | -2 | Cecil | 39 39 30 N | 076 09 59 W |
| Amos Island (historical) | Island | 30 | Harford | 39 39 59 N | 076 11 12 W |
| Amos Mill | Populated Place | 180 | Harford | 39 42 01 N | 076 30 04 W |
| Amoss | Populated Place | 140 | Harford | 39 31 41 N | 076 24 37 W |
| Amyclae Estates | Populated Place | 104 | Harford | 39 32 59 N | 076 19 19 W |
| Amys Acres | Populated Place | 48 | Charles | 38 27 34 N | 076 53 50 W |
| Amys Marsh Point | Cape | -3 | Talbot | 38 43 48 N | 076 20 31 W |
| Anacostia River Park | Park | 5 | Prince George's | 38 57 06 N | 076 55 46 W |
| Anchor Baptist Church | Church | 45 | Anne Arundel | 39 06 11 N | 076 36 04 W |
| Anchor Yacht Basin | Harbor | -2 | Anne Arundel | 38 54 07 N | 076 30 34 W |
| Anchorage | Populated Place | 9 | Anne Arundel | 38 56 38 N | 076 28 25 W |
| Anchorage | Populated Place | 3 | Talbot | 38 47 44 N | 076 08 18 W |
| Anchorage Anchors | Populated Place | 3 | Charles | 38 19 02 N | 076 54 18 W |