Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Langford Marsh | Swamp | 1 | Somerset | 37 58 46 N | 075 45 47 W |
| Langford Sand | Beach | 7 | Somerset | 37 58 18 N | 075 46 06 W |
| Langfords Bay | Bay | 3 | Kent | 39 06 29 N | 076 09 18 W |
| Langley Hollow | Lake | 0 | St. Mary's | 38 08 45 N | 076 26 04 W |
| Langley Island | Island | 16 | Montgomery | 38 58 00 N | 077 09 37 W |
| Langley Park | Populated Place | 46 | Prince George's | 38 59 19 N | 076 58 53 W |
| Langley Park School | School | 47 | Prince George's | 38 59 34 N | 076 58 53 W |
| Langley Park Shopping Center | Locale | 55 | Prince George's | 38 59 22 N | 076 59 10 W |
| Langmaid Landing | Populated Place | 1 | Worcester | 38 13 53 N | 075 15 04 W |
| Langrells Creek | Stream | | Dorchester | 38 18 47 N | 075 55 48 W |
| Langrells Island | Island | 0 | Dorchester | 38 19 29 N | 075 56 36 W |
| Langston Hughes Elementary School | School | 133 | Baltimore (city) | 39 20 32 N | 076 40 53 W |
| Lanham | Populated Place | 43 | Prince George's | 38 58 01 N | 076 51 43 W |
| Lanham Cemetery | Cemetery | 56 | Prince George's | 38 57 32 N | 076 51 30 W |
| Lanham Forest Recreation Center | Park | 33 | Prince George's | 38 57 23 N | 076 50 49 W |
| Lanham School | School | 44 | Prince George's | 38 57 56 N | 076 51 21 W |
| Lanham Shopping Center | Locale | 44 | Prince George's | 38 57 31 N | 076 51 52 W |
| Lanham United Methodist Church | Church | 57 | Prince George's | 38 57 34 N | 076 51 29 W |
| Lans Pond | Lake | 0 | Dorchester | 38 23 48 N | 076 05 46 W |
| Lansdowne | Populated Place | 26 | Baltimore | 39 14 42 N | 076 39 38 W |
| Lansdowne Branch Baltimore County Public Library | Building | 34 | Baltimore | 39 14 37 N | 076 39 14 W |
| Lansdowne Elementary School | School | 46 | Baltimore | 39 14 57 N | 076 39 27 W |
| Lansdowne High School | School | 39 | Baltimore | 39 14 40 N | 076 39 03 W |
| Lansdowne Industrial Park | Locale | 34 | Baltimore | 39 14 52 N | 076 38 58 W |
| Lansdowne Middle School | School | 40 | Baltimore | 39 14 59 N | 076 39 09 W |
| Lansdowne Volunteer Firemens Association Number 1 Station 36 | Building | | Baltimore | 39 14 47 N | 076 39 40 W |
| Lanseair Farms Airport | Airport | 6 | Charles | 38 27 41 N | 077 02 47 W |
| Lantz | Locale | 299 | Frederick | 39 40 26 N | 077 27 16 W |
| Lantz Post Office | Post Office | 293 | Frederick | 39 40 29 N | 077 27 19 W |
| Lap | Populated Place | 380 | Allegany | 39 41 41 N | 078 50 48 W |
| Lapidum | Populated Place | 8 | Harford | 39 35 52 N | 076 07 44 W |
| Lapidum Heights | Populated Place | 69 | Harford | 39 35 30 N | 076 07 45 W |
| Lappans | Populated Place | 140 | Washington | 39 33 13 N | 077 44 14 W |
| Larchdale Park | Park | 76 | Prince George's | 39 04 23 N | 076 51 41 W |
| Larchmont Elementary School | School | 128 | Baltimore | 39 19 13 N | 076 43 09 W |
| Larchmont Knolls | Populated Place | 85 | Montgomery | 39 00 41 N | 077 04 40 W |
| Lareine High School | School | 85 | Prince George's | 38 51 18 N | 076 55 08 W |
| Largo | Populated Place | 53 | Prince George's | 38 53 51 N | 076 49 49 W |
| Largo High School | School | 48 | Prince George's | 38 53 12 N | 076 49 12 W |
| Largo-Kettering Branch Library | Building | 41 | Prince George's | 38 53 30 N | 076 50 22 W |
| Largo-Lottsford Community Park | Park | 54 | Prince George's | 38 54 23 N | 076 49 49 W |
| Largo-Northampton Urban Center | Park | 41 | Prince George's | 38 53 24 N | 076 50 05 W |
| Lark Hill | Populated Place | 34 | Anne Arundel | 39 02 03 N | 076 30 36 W |
| Larkington | Populated Place | 1 | Anne Arundel | 38 55 15 N | 076 31 44 W |
| Larkington Cove | Bay | 1 | Anne Arundel | 38 55 35 N | 076 31 44 W |
| Larox Miracle Land | Populated Place | 173 | Carroll | 39 37 45 N | 077 05 34 W |
| Larrimore Point | Cape | 5 | Anne Arundel | 38 56 12 N | 076 32 08 W |
| Larvadale Estates | Populated Place | 149 | Frederick | 39 31 08 N | 077 26 02 W |
| LaSalle High School | School | 192 | Allegany | 39 39 17 N | 078 45 50 W |
| Lashley Cemetery | Cemetery | 274 | Allegany | 39 43 01 N | 078 32 24 W |
| Latchum Creek | Stream | | Worcester | 38 24 53 N | 075 10 25 W |
| Lathrop E Smith Environmental Education Center | School | 123 | Montgomery | 39 06 44 N | 077 06 24 W |
| Latigo Trails | Populated Place | 237 | Carroll | 39 25 53 N | 077 03 19 W |
| Latrobe Homes | Populated Place | 17 | Baltimore (city) | 39 17 58 N | 076 36 11 W |
| Latrobe Park | Park | 5 | Baltimore (city) | 39 16 02 N | 076 35 33 W |
| Latter Day Saints Church | Church | 111 | Montgomery | 39 01 27 N | 077 01 08 W |
| Latter Day Saints Church | Church | 127 | Montgomery | 39 02 47 N | 077 11 30 W |
| Latvian Lutheran Church | Church | 116 | Montgomery | 39 05 10 N | 077 10 45 W |
| Lauderick Creek | Stream | | Harford | 39 24 18 N | 076 16 01 W |
| Laura Lee Estates | Populated Place | 229 | Carroll | 39 32 18 N | 076 54 20 W |
| Lauraville | Populated Place | 73 | Baltimore (city) | 39 20 41 N | 076 33 27 W |
| Lauraville United Methodist Church | Church | 75 | Baltimore (city) | 39 20 42 N | 076 34 05 W |
| Laurel | Populated Place | 50 | Prince George's | 39 05 57 N | 076 50 54 W |
| Laurel Acres | Populated Place | 12 | Anne Arundel | 39 05 35 N | 076 31 02 W |
| Laurel Acres | Populated Place | 52 | Charles | 38 36 50 N | 077 04 60 W |
| Laurel Branch | Populated Place | 46 | Charles | 38 38 25 N | 077 00 33 W |
| Laurel Branch | Stream | | Frederick | 39 29 53 N | 077 18 19 W |
| Laurel Branch Library | Building | 57 | Prince George's | 39 06 14 N | 076 51 21 W |
| Laurel Branch Prince George's County Memorial Library | Building | 56 | Prince George's | 39 06 10 N | 076 51 23 W |
| Laurel Brook | Populated Place | 146 | Harford | 39 31 15 N | 076 27 24 W |
| Laurel Brook | Populated Place | 97 | Harford | 39 30 24 N | 076 25 44 W |
| Laurel Brook | Stream | | Harford | 39 30 17 N | 076 25 48 W |
| Laurel Cemetery (historical) | Cemetery | 46 | Baltimore (city) | 39 19 03 N | 076 34 33 W |
| Laurel Centre Mall Shopping Center | Locale | 57 | Prince George's | 39 05 35 N | 076 51 31 W |
| Laurel Chase Manor | Populated Place | 41 | Cecil | 39 31 36 N | 075 56 19 W |
| Laurel Elementary School | School | 55 | Prince George's | 39 06 18 N | 076 51 08 W |
| Laurel Grove | Populated Place | 42 | St. Mary's | 38 24 42 N | 076 40 40 W |
| Laurel Grove Church (historical) | Church | 16 | Caroline | 38 46 22 N | 075 50 35 W |
| Laurel Grove Park | Park | 41 | St. Mary's | 38 24 20 N | 076 40 22 W |
| Laurel Harness Racing Track | Locale | 58 | Howard | 39 07 39 N | 076 49 24 W |
| Laurel High School | School | 76 | Prince George's | 39 05 39 N | 076 52 03 W |
| Laurel High School | School | 60 | Prince George's | 39 06 24 N | 076 51 20 W |
| Laurel Hill | Summit | 163 | Frederick | 39 31 31 N | 077 18 10 W |
| Laurel Hill Country Club | Locale | 164 | Baltimore | 39 22 59 N | 076 51 04 W |
| Laurel Junior High School | School | 75 | Prince George's | 39 06 14 N | 076 52 02 W |
| Laurel Lake | Lake | 53 | Prince George's | 39 05 28 N | 076 51 40 W |
| Laurel Lakes Shopping Center | Locale | 73 | Prince George's | 39 05 05 N | 076 51 49 W |
| Laurel Oaks (subdivision) | Populated Place | 75 | Prince George's | 39 05 45 N | 076 52 33 W |
| Laurel Pines Country Club | Locale | 45 | Prince George's | 39 05 29 N | 076 50 35 W |
| Laurel Plaza Shopping Center | Locale | 42 | Prince George's | 39 05 47 N | 076 50 22 W |
| Laurel Police Department | Building | | Prince George's | 39 11 00 N | 077 24 48 W |
| Laurel Post Office | Post Office | 50 | Prince George's | 39 06 17 N | 076 50 46 W |
| Laurel Presbyterian Church | Church | 80 | Prince George's | 39 06 17 N | 076 52 24 W |
| Laurel Racetrack | Locale | 44 | Anne Arundel | 39 06 15 N | 076 49 49 W |
| Laurel Regional Hospital | Hospital | 83 | Prince George's | 39 05 12 N | 076 52 54 W |
| Laurel Run | Populated Place | 31 | St. Mary's | 38 12 48 N | 076 25 53 W |
| Laurel Run | Stream | | Cecil | 39 37 18 N | 075 52 13 W |
| Laurel Run | Stream | | Garrett | 39 14 46 N | 079 24 33 W |
| Laurel Run | Stream | | Garrett | 39 32 41 N | 079 00 25 W |
| Laurel Run | Stream | | Garrett | 39 41 15 N | 079 26 21 W |
| Laurel Run | Stream | 728 | Garrett | 39 23 04 N | 079 28 13 W |
| Laurel Run | Stream | | Garrett | 39 37 48 N | 079 25 20 W |
| Laurel Run | Stream | | Garrett | 39 20 34 N | 079 15 27 W |
| Laurel Run | Stream | | Garrett | 39 28 28 N | 079 06 20 W |
| Laurel Seventh Day Adventist Church | Church | 141 | Montgomery | 39 06 13 N | 076 55 13 W |
| Laurel Shopping Center | Locale | 55 | Prince George's | 39 05 46 N | 076 51 15 W |
| Laurel Springs Regional Park | Park | 60 | Charles | 38 33 14 N | 076 56 59 W |
| Laurel Springs Regional Park | Park | 59 | Charles | 38 33 13 N | 076 57 04 W |
| Laurel Valley | Populated Place | 84 | Harford | 39 29 10 N | 076 18 44 W |
| Laurel Volunteer Fire Department Company 10 | Building | | Prince George's | 39 09 40 N | 077 28 10 W |