Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Arbutus | Populated Place | 46 | Baltimore | 39 15 16 N | 076 42 00 W |
| Arbutus Branch Baltimore County Public Library | Building | 30 | Baltimore | 39 14 58 N | 076 41 19 W |
| Arbutus Elementary School | School | 29 | Baltimore | 39 14 51 N | 076 41 48 W |
| Arbutus Memorial Park Cemetery | Cemetery | 49 | Baltimore | 39 14 41 N | 076 42 25 W |
| Arbutus Middle School | School | 44 | Baltimore | 39 14 53 N | 076 42 20 W |
| Arbutus Plaza Shopping Center | Locale | 55 | Baltimore | 39 15 40 N | 076 41 45 W |
| Arbutus United Methodist Church | Church | 23 | Baltimore | 39 14 59 N | 076 41 34 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 |
| Arden Valley | Populated Place | 200 | Baltimore | 39 34 25 N | 076 41 19 W |
| Armacost | Populated Place | 221 | Baltimore | 39 36 48 N | 076 48 14 W |
| Armacost Farms Airport | Airport | 192 | Baltimore | 39 36 12 N | 076 44 40 W |
| Armagh | Populated Place | 120 | Baltimore | 39 22 52 N | 076 37 12 W |
| Ascension Evangelical Lutheran Church | Church | 141 | Baltimore | 39 23 12 N | 076 36 21 W |
| Ascension Prince of Peace Episcopal Church | Church | 160 | Baltimore | 39 21 28 N | 076 46 09 W |
| Ascension School | School | 24 | Baltimore | 39 14 24 N | 076 41 23 W |
| Ascot Estates | Populated Place | 181 | Baltimore | 39 31 14 N | 076 33 52 W |
| Ashland | Populated Place | 87 | Baltimore | 39 29 43 N | 076 38 24 W |
| Ashland Corner Shopping Center | Locale | | Baltimore | 39 29 34 N | 076 38 55 W |
| Ashland Furnace (historical) | Locale | 120 | Baltimore | 39 29 36 N | 076 41 18 W |
| Ashland Marketplace Shopping Center | Locale | | Baltimore | 39 29 26 N | 076 38 50 W |
| Ashland Presbyterian Church | Church | 80 | Baltimore | 39 29 39 N | 076 38 36 W |
| Ashland Spring | Spring | 139 | Baltimore | 39 29 38 N | 076 38 03 W |
| Ashlar Hill | Populated Place | 109 | Baltimore | 39 22 45 N | 076 34 24 W |
| Asylum (historical) | Populated Place | 127 | Baltimore | 39 16 01 N | 076 43 29 W |
| Augsburg Home | Building | 141 | Baltimore | 39 20 55 N | 076 43 29 W |
| Autumn Wind | Populated Place | 184 | Baltimore | 39 27 52 N | 076 43 35 W |
| Avalon | Populated Place | 68 | Baltimore | 39 13 53 N | 076 43 12 W |
| Back River | Populated Place | 3 | Baltimore | 39 18 02 N | 076 29 36 W |
| Back River | Stream | | Baltimore | 39 14 37 N | 076 24 01 W |
| Back River Church | Church | 6 | Baltimore | 39 17 41 N | 076 25 55 W |
| Back River Highlands | Populated Place | 16 | Baltimore | 39 18 53 N | 076 28 50 W |
| Back River Neck | Cape | 6 | Baltimore | 39 16 27 N | 076 25 02 W |
| Back River Neck Fire Department Station 58 | Building | | Baltimore | 39 17 08 N | 076 25 37 W |
| Back River School | School | 9 | Baltimore | 39 17 19 N | 076 25 31 W |
| Back River Sewage Treatment Plant | Locale | 10 | Baltimore | 39 17 33 N | 076 29 29 W |
| Bacon Hall | Populated Place | 156 | Baltimore | 39 34 17 N | 076 40 55 W |
| Bacon House | Building | | Baltimore | 39 24 21 N | 076 35 33 W |
| Bais Yaakov School for Girls | School | 167 | Baltimore | 39 25 38 N | 076 43 32 W |
| Baisman Run | Stream | | Baltimore | 39 28 38 N | 076 40 22 W |
| Baldwin | Populated Place | 113 | Baltimore | 39 29 41 N | 076 28 13 W |
| Baldwin Estates | Populated Place | 143 | Baltimore | 39 29 01 N | 076 26 59 W |
| Baldwin Mill Terrace | Populated Place | 160 | Baltimore | 39 30 32 N | 076 28 39 W |
| Baldwin Post Office | Post Office | 112 | Baltimore | 39 29 40 N | 076 28 16 W |
| Baldwin Station | Locale | 114 | Baltimore | 39 29 52 N | 076 28 21 W |
| Ballard Gardens | Populated Place | 14 | Baltimore | 39 20 11 N | 076 26 38 W |
| Balliston Point | Cape | 1 | Baltimore | 39 16 09 N | 076 23 45 W |
| Baltimore Airpark (historical) | Airport | 50 | Baltimore | 39 24 16 N | 076 25 34 W |
| Baltimore Country Club at Five Farms | Locale | 177 | Baltimore | 39 26 32 N | 076 39 59 W |
| Baltimore County | Civil | 91 | Baltimore | 39 28 00 N | 076 38 59 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 General Hospital | Hospital | 154 | Baltimore | 39 21 24 N | 076 46 59 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 Highlands | Populated Place | 10 | Baltimore | 39 13 59 N | 076 38 12 W |
| Baltimore Highlands Elementary School | School | 28 | Baltimore | 39 14 12 N | 076 38 32 W |
| Baltimore Municipal Airport (historical) | Airport | 4 | Baltimore | 39 14 49 N | 076 31 49 W |
| Baltimore National Cemetery | Cemetery | 99 | Baltimore | 39 16 29 N | 076 42 22 W |
| Baltimore Police Department Heliport | Airport | 5 | Baltimore | 39 17 25 N | 076 36 27 W |
| Baltimore Yacht Club | Locale | -2 | Baltimore | 39 17 23 N | 076 23 44 W |
| Banneker School | School | 158 | Baltimore | 39 16 49 N | 076 44 29 W |
| Baptist Home of Maryland | Building | 165 | Baltimore | 39 25 07 N | 076 43 38 W |
| Bare Hills | Populated Place | 100 | Baltimore | 39 22 52 N | 076 39 12 W |
| Bare Hills | Range | 128 | Baltimore | 39 22 42 N | 076 40 23 W |
| Baronet Woods | Populated Place | 179 | Baltimore | 39 25 34 N | 076 44 39 W |
| Barren Point | Cape | -13 | Baltimore | 39 18 26 N | 076 25 06 W |
| Barrington | Populated Place | 30 | Baltimore | 39 21 17 N | 076 28 05 W |
| Basils Church | Church | 177 | Baltimore | 39 28 59 N | 076 37 47 W |
| Batavia Park | Park | 18 | Baltimore | 39 18 58 N | 076 29 58 W |
| Batter Brook Farms | Populated Place | 87 | Baltimore | 39 26 16 N | 076 26 18 W |
| Battery Augustin (historical) | Military (Historical) | 0 | Baltimore | 39 12 52 N | 076 31 12 W |
| Battery Clagett (historical) | Military (Historical) | 2 | Baltimore | 39 11 52 N | 076 26 28 W |
| Battery Harris (historical) | Military (Historical) | 3 | Baltimore | 39 11 46 N | 076 26 34 W |
| Battery Heart (historical) | Military (Historical) | 0 | Baltimore | 39 12 51 N | 076 31 11 W |
| Battery Lazear (historical) | Military (Historical) | 0 | Baltimore | 39 11 49 N | 076 26 47 W |
| Battery Nicholson (historical) | Military (Historical) | 3 | Baltimore | 39 11 46 N | 076 26 40 W |
| Battery Point | Cape | 3 | Baltimore | 39 20 08 N | 076 19 55 W |
| Battery Stricker (historical) | Military (Historical) | 3 | Baltimore | 39 11 46 N | 076 26 37 W |
| Battery Towson (historical) | Military (Historical) | 1 | Baltimore | 39 12 52 N | 076 31 09 W |
| Battle Grove | Populated Place | 3 | Baltimore | 39 16 19 N | 076 28 38 W |
| Battle Grove Park | Park | 3 | Baltimore | 39 15 45 N | 076 28 10 W |
| Battle Grove School | School | 6 | Baltimore | 39 16 10 N | 076 28 32 W |
| Battle Monument School | School | 3 | Baltimore | 39 16 28 N | 076 28 60 W |
| Bay Shore Park (historical) | Populated Place | 3 | Baltimore | 39 12 27 N | 076 25 38 W |
| Baynesville | Populated Place | 135 | Baltimore | 39 24 00 N | 076 33 43 W |
| Bayshore (historical) | Populated Place | 1 | Baltimore | 39 12 54 N | 076 25 14 W |
| Beachwood | Populated Place | 2 | Baltimore | 39 16 27 N | 076 27 17 W |
| Beacon Hill | Populated Place | 141 | Baltimore | 39 28 36 N | 076 37 51 W |
| Bear Creek | Stream | | Baltimore | 39 13 06 N | 076 30 18 W |
| Bear Creek Junction | Populated Place | 5 | Baltimore | 39 14 41 N | 076 28 01 W |
| Bear Creek Park | Park | 4 | Baltimore | 39 16 17 N | 076 29 13 W |
| Bear Creek School | School | 3 | Baltimore | 39 16 07 N | 076 28 53 W |
| Beaverdam Pond | Lake | 80 | Baltimore | 39 28 44 N | 076 39 25 W |
| Beaverdam Run | Stream | | Baltimore | 39 29 44 N | 076 37 10 W |
| Beckleysville | Populated Place | 196 | Baltimore | 39 38 30 N | 076 46 41 W |
| Bedford Elementary School | School | | Baltimore | 39 21 37 N | 076 43 49 W |
| Beetree | Populated Place | 167 | Baltimore | 39 41 01 N | 076 40 01 W |
| Beetree Manor | Populated Place | 224 | Baltimore | 39 42 04 N | 076 41 14 W |
| Beetree Mill | Locale | 217 | Baltimore | 39 41 45 N | 076 38 46 W |
| Beetree Run | Stream | | Baltimore | 39 39 58 N | 076 40 21 W |
| Belair Beltway Plaza Shopping Center | Locale | 58 | Baltimore | 39 22 00 N | 076 31 05 W |