Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Adelphi Recreation Center | Park | 56 | Prince George's | 39 00 26 N | 076 57 40 W |
| Adelphi School | School | 53 | Prince George's | 39 00 01 N | 076 58 25 W |
| Adil Meadows | Populated Place | 151 | Baltimore | 39 17 38 N | 076 45 19 W |
| Adkins Mill Park | Park | 8 | Wicomico | 38 20 10 N | 075 22 40 W |
| Adkins Pond | Reservoir | 8 | Wicomico | 38 19 58 N | 075 22 31 W |
| Adkins Race | Stream | | Wicomico | 38 19 07 N | 075 21 16 W |
| Adkinson School (historical) | School | 14 | Worcester | 38 13 02 N | 075 33 30 W |
| Administration Headquarters Police Station | Building | 133 | Montgomery | 39 06 08 N | 077 11 16 W |
| Administrative Offices Prince George's County Memorial Library System | Building | 24 | Prince George's | 38 58 07 N | 076 56 59 W |
| Admiral (historical) | Populated Place | 42 | Anne Arundel | 39 05 24 N | 076 44 04 W |
| Admiral Heights | Populated Place | 12 | Anne Arundel | 38 59 05 N | 076 31 07 W |
| Admirals Walk | Populated Place | 11 | Anne Arundel | 39 02 04 N | 076 26 50 W |
| Advocate Hill Farms | Populated Place | 189 | Harford | 39 35 58 N | 076 27 40 W |
| Advocates Choice | Populated Place | 214 | Carroll | 39 38 30 N | 076 58 59 W |
| Ady | Populated Place | 145 | Harford | 39 38 19 N | 076 19 58 W |
| Ady Estates | Populated Place | 121 | Harford | 39 40 04 N | 076 21 14 W |
| Aero Acres | Populated Place | 19 | Baltimore | 39 19 56 N | 076 27 11 W |
| Aero Acres Shopping Center | Locale | 8 | Baltimore | 39 19 57 N | 076 26 43 W |
| Aerospace Tech Center Heliport | Airport | 127 | Howard | 39 14 11 N | 076 49 34 W |
| AFI Silver Theatre and Cultural Center | Building | 105 | Montgomery | 38 59 47 N | 077 01 38 W |
| Ager Road School | School | 15 | Prince George's | 38 57 55 N | 076 58 21 W |
| Ager Road United Methodist Church | Church | 16 | Prince George's | 38 58 01 N | 076 58 28 W |
| Agner | Populated Place | 13 | Caroline | 38 45 20 N | 075 47 22 W |
| Agudas Achim Anshei Sphard Synagogue (historical) | Church | 127 | Baltimore (city) | 39 20 17 N | 076 39 53 W |
| Aikin | Populated Place | 42 | Cecil | 39 34 26 N | 076 04 04 W |
| Air Business Center | Locale | 14 | Wicomico | 38 19 57 N | 075 30 24 W |
| Airedele | Populated Place | 0 | St. Mary's | 38 07 06 N | 076 20 53 W |
| Airey | Populated Place | 5 | Dorchester | 38 31 22 N | 075 59 34 W |
| Airey Cemetery | Cemetery | 2 | Dorchester | 38 30 56 N | 075 59 19 W |
| Airport Acres | Populated Place | 253 | Carroll | 39 27 50 N | 077 00 56 W |
| Airport Beach (historical) | Populated Place | 1 | Baltimore | 39 15 48 N | 076 26 18 W |
| Airport Business Center | Locale | 171 | Montgomery | 39 10 04 N | 077 09 23 W |
| Airport Commons Distribution Center | Locale | | Anne Arundel | 39 10 23 N | 076 41 57 W |
| Airport Industrial Park | Locale | 91 | Frederick | 39 24 45 N | 077 22 57 W |
| Airport Industrial Park | Locale | 213 | Washington | 39 42 51 N | 077 43 16 W |
| Airport Square Business Park | Locale | | Anne Arundel | 39 12 00 N | 076 41 15 W |
| Airport Square Technology Park | Locale | 43 | Anne Arundel | 39 12 15 N | 076 40 45 W |
| Airy Estates | Populated Place | 211 | Carroll | 39 24 21 N | 077 08 02 W |
| Aisquith Presbyterian Church | Church | 102 | Baltimore (city) | 39 22 15 N | 076 32 41 W |
| Akers Acres | Populated Place | 210 | Frederick | 39 26 43 N | 077 28 39 W |
| Akers Ferry (historical) | Crossing | -3 | Talbot | 38 34 57 N | 076 03 14 W |
| Al White Marsh | Swamp | 0 | Wicomico | 38 15 54 N | 075 52 44 W |
| Aladdin Village Trailer Park | Populated Place | 73 | Howard | 39 10 28 N | 076 46 60 W |
| Alameda Shopping Center | Locale | 94 | Baltimore (city) | 39 21 32 N | 076 35 45 W |
| Albantown | Populated Place | 240 | Baltimore | 39 38 27 N | 076 48 32 W |
| Albatross Mobile Home Park | Populated Place | 6 | Worcester | 38 21 09 N | 075 09 28 W |
| Albert Einstein High School | School | 111 | Montgomery | 39 02 20 N | 077 04 01 W |
| Albert S Cook Library | Building | 126 | Baltimore | 39 23 37 N | 076 36 24 W |
| Alberta Heights | Populated Place | 30 | Anne Arundel | 39 09 05 N | 076 40 04 W |
| Alberton (historical) | Populated Place | 71 | Howard | 39 19 03 N | 076 48 49 W |
| Albeth Heights | Populated Place | 139 | Howard | 39 18 07 N | 076 54 04 W |
| Albrecht Airstrip | Airport | 97 | Baltimore | 39 28 24 N | 076 30 01 W |
| Albright Point | Cape | 0 | St. Mary's | 38 09 58 N | 076 31 04 W |
| Alcock House | Building | | Baltimore | 39 24 30 N | 076 35 28 W |
| Alder Branch | Stream | | Queen Anne's | 39 04 09 N | 076 05 05 W |
| Aldersgate United Methodist Church | Church | 85 | Baltimore (city) | 39 20 20 N | 076 38 20 W |
| Aldino | Populated Place | 128 | Harford | 39 33 50 N | 076 11 45 W |
| Aldridges Fishery | Locale | 1 | Cecil | 39 31 57 N | 075 53 14 W |
| Aleck Pond | Bay | -3 | Worcester | 38 21 38 N | 075 06 58 W |
| Alesia | Populated Place | 223 | Carroll | 39 40 59 N | 076 49 44 W |
| Alesia Cemetery | Cemetery | 280 | Carroll | 39 41 32 N | 076 50 12 W |
| Alesia Heights | Populated Place | 251 | Carroll | 39 41 05 N | 076 49 18 W |
| Alex Haley Residence Hall | Building | | Prince George's | 39 01 10 N | 076 45 25 W |
| Alexander Branch | Stream | | Anne Arundel | 38 54 00 N | 076 32 23 W |
| Alexander Hamilton Elementary School | School | 63 | Baltimore (city) | 39 17 51 N | 076 39 57 W |
| Alexander Run | Stream | | Garrett | 39 39 22 N | 079 12 13 W |
| Alexandria Cemetery | Cemetery | 30 | Charles | 38 32 14 N | 077 12 03 W |
| Alexandria Church | Church | 36 | Charles | 38 32 29 N | 077 11 59 W |
| Algonquin | Populated Place | 4 | Dorchester | 38 34 58 N | 076 06 21 W |
| Alicia Crossland Public School (historical) | School | 22 | Baltimore (city) | 39 17 24 N | 076 37 27 W |
| All Faith Cemetery | Cemetery | 49 | St. Mary's | 38 28 02 N | 076 43 49 W |
| All Faith Episcopal Church | Church | 49 | St. Mary's | 38 28 03 N | 076 43 50 W |
| All Faiths Episcopal Church | Church | 2 | Talbot | 38 49 12 N | 076 09 55 W |
| All Hallows Cemetery | Cemetery | 43 | Anne Arundel | 38 54 38 N | 076 34 51 W |
| All Hallows Cemetery | Cemetery | 5 | Worcester | 38 10 32 N | 075 23 40 W |
| All Hallows Chapel | Church | 55 | Anne Arundel | 38 55 14 N | 076 37 59 W |
| All Hallows Church | Church | 43 | Anne Arundel | 38 54 38 N | 076 34 52 W |
| All Hallows Episcopal Church | Church | 4 | Worcester | 38 10 32 N | 075 23 43 W |
| All Hardwoods Branch | Stream | | Anne Arundel | 38 52 00 N | 076 36 19 W |
| All Pure Spring | Spring | 110 | Montgomery | 39 03 38 N | 077 09 44 W |
| All Saints Cemetery | Cemetery | 50 | Calvert | 38 39 43 N | 076 36 23 W |
| All Saints Cemetery | Cemetery | 3 | Somerset | 38 11 32 N | 075 46 02 W |
| All Saints Cemetery | Cemetery | 9 | St. Mary's | 38 17 18 N | 076 44 29 W |
| All Saints Cemetery | Cemetery | 8 | Talbot | 38 50 47 N | 076 04 53 W |
| All Saints Church | Church | 52 | Anne Arundel | 39 07 17 N | 076 47 40 W |
| All Saints Church | Church | 51 | Calvert | 38 39 43 N | 076 36 25 W |
| All Saints Church | Church | 3 | Somerset | 38 11 30 N | 075 45 59 W |
| All Saints Church | Church | 9 | St. Mary's | 38 17 19 N | 076 44 27 W |
| All Saints Church | Church | 9 | Talbot | 38 50 46 N | 076 04 52 W |
| All Saints Convent | Church | 92 | Baltimore | 39 14 25 N | 076 44 36 W |
| All Saints Episcopal Church | Church | 51 | Baltimore | 39 17 16 N | 076 38 48 W |
| All Saints Episcopal Church | Church | 87 | Frederick | 39 24 54 N | 077 24 46 W |
| All Saints Evangelical Lutheran Church | Church | 90 | Baltimore (city) | 39 17 38 N | 076 40 52 W |
| All Saints Roman Catholic Church | Church | 127 | Baltimore (city) | 39 19 50 N | 076 41 30 W |
| All Saints School | School | 127 | Baltimore (city) | 39 19 50 N | 076 41 29 W |
| All Souls Episcopal Church | Church | 13 | Baltimore (city) | 39 14 06 N | 076 36 35 W |
| Allan Church | Church | 13 | Caroline | 38 55 00 N | 075 55 32 W |
| Allana Acres | Populated Place | 319 | Carroll | 39 42 49 N | 076 54 54 W |
| Allandale | Populated Place | 176 | Carroll | 39 37 43 N | 077 03 52 W |
| Allanwood | Populated Place | 109 | Montgomery | 39 06 38 N | 077 02 11 W |
| Allegany Cemetery | Cemetery | 595 | Allegany | 39 38 55 N | 078 55 12 W |
| Allegany Community College | School | 195 | Allegany | 39 39 09 N | 078 43 46 W |
| Allegany County | Civil | 410 | Allegany | 39 40 00 N | 078 39 59 W |
| Allegany County Courthouse | Building | 209 | Allegany | 39 39 03 N | 078 46 01 W |
| Allegany County Infirmary (historical) | Hospital | 218 | Allegany | 39 39 57 N | 078 45 53 W |
| Allegany County Public Library | Building | 209 | Allegany | 39 39 04 N | 078 46 00 W |
| Allegany Grove | Populated Place | 291 | Allegany | 39 38 24 N | 078 49 41 W |
| Allegany Hall | Building | 604 | Allegany | 39 39 07 N | 078 55 45 W |
| Allegany High School | School | 239 | Allegany | 39 39 20 N | 078 46 32 W |
| Allegany State Police Department | Building | | Allegany | 40 04 37 N | 079 23 25 W |