Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Leishear Village | Populated Place | 103 | Howard | 39 08 42 N | 076 52 44 W |
| Leisure Hill | Populated Place | 134 | Baltimore | 39 24 06 N | 076 43 55 W |
| Leisure Mountain | Populated Place | 506 | Frederick | 39 36 19 N | 077 29 22 W |
| Leitch | Populated Place | 7 | Anne Arundel | 38 45 54 N | 076 33 46 W |
| Leitch Wharf | Locale | 6 | Calvert | 38 32 36 N | 076 39 50 W |
| Leitersburg | Populated Place | 181 | Washington | 39 41 33 N | 077 37 22 W |
| Leitersburg Volunteer Fire Company 9 | Building | | Washington | 40 09 33 N | 078 02 14 W |
| Leith Walk School | School | 122 | Baltimore (city) | 39 21 54 N | 076 35 28 W |
| Lejeune Hall | Building | 3 | Anne Arundel | 38 58 43 N | 076 28 59 W |
| Leland Junior High School | School | 97 | Montgomery | 38 58 59 N | 077 05 12 W |
| Leland Memorial Hospital | Hospital | 21 | Prince George's | 38 57 48 N | 076 56 27 W |
| Lelands Corner | Populated Place | 83 | Montgomery | 39 00 43 N | 077 09 36 W |
| Lemach Zedak Shomrei Hadas Congregation | Church | 38 | Baltimore (city) | 39 17 34 N | 076 35 12 W |
| Leming | Populated Place | 5 | Calvert | 38 29 28 N | 076 38 49 W |
| Lemons Bridge (historical) | Bridge | 18 | Anne Arundel | 39 02 13 N | 076 45 32 W |
| Lemons Ferry (historical) | Crossing | 97 | Washington | 39 35 57 N | 077 49 50 W |
| Lennie Creek | Stream | | St. Mary's | 38 14 00 N | 076 29 43 W |
| Lennox Park | Populated Place | 34 | Anne Arundel | 39 10 21 N | 076 44 39 W |
| Lennox Park | Populated Place | 56 | Howard | 39 10 35 N | 076 45 06 W |
| Lens Rambles | Populated Place | 261 | Frederick | 39 30 47 N | 077 36 04 W |
| Leon | Populated Place | 15 | Anne Arundel | 38 47 34 N | 076 42 05 W |
| Leonard Cove | Bay | 2 | Talbot | 38 39 09 N | 076 05 59 W |
| Leonard Farm | Populated Place | 11 | Wicomico | 38 23 57 N | 075 34 29 W |
| Leonard Hall School | School | 33 | St. Mary's | 38 18 11 N | 076 37 50 W |
| Leonard Pond | Lake | 11 | Wicomico | 38 25 32 N | 075 33 25 W |
| Leonard Pond | Reservoir | 7 | Wicomico | 38 25 24 N | 075 33 59 W |
| Leonard Pond Dam | Dam | 7 | Wicomico | 38 25 24 N | 075 33 59 W |
| Leonard Pond Run | Stream | | Wicomico | 38 24 39 N | 075 35 40 W |
| Leonards Mill Park | Park | 9 | Wicomico | 38 25 25 N | 075 33 59 W |
| Leonards Mill Park | Park | 11 | Wicomico | 38 25 26 N | 075 33 56 W |
| Leonardtown | Populated Place | 26 | St. Mary's | 38 17 28 N | 076 38 09 W |
| Leonardtown Baptist Church | Church | 39 | St. Mary's | 38 18 51 N | 076 37 45 W |
| Leonardtown Elementary School | School | 25 | St. Mary's | 38 17 47 N | 076 38 22 W |
| Leonardtown High School | School | 36 | St. Mary's | 38 16 12 N | 076 36 41 W |
| Leonardtown Middle School | School | 36 | St. Mary's | 38 16 25 N | 076 36 44 W |
| Leonardtown Park | Park | 23 | St. Mary's | 38 17 43 N | 076 38 22 W |
| Leonardtown Post Office | Post Office | 23 | St. Mary's | 38 17 22 N | 076 38 04 W |
| Leonardtown Public School (historical) | School | 28 | St. Mary's | 38 17 43 N | 076 38 14 W |
| Leonardtown Square Shopping Center | Locale | 28 | St. Mary's | 38 17 48 N | 076 38 09 W |
| Leonardtown Town Hall | Building | 26 | St. Mary's | 38 17 22 N | 076 38 06 W |
| Leonardtown Volunteer Fire Company 1 | Building | | St. Mary's | 38 29 29 N | 077 04 19 W |
| Leonardtown Volunteer Rescue Squad Company 19 | Building | | St. Mary's | 38 29 59 N | 077 04 17 W |
| Leonardtown Wharf | Locale | -11 | St. Mary's | 38 17 09 N | 076 38 20 W |
| Leonidas James Physical Education Complex | Building | | Prince George's | 39 01 14 N | 076 45 39 W |
| Lerch Creek | Bay | -4 | Anne Arundel | 38 50 22 N | 076 32 52 W |
| Lerch Creek Marsh | Swamp | 3 | Anne Arundel | 38 50 40 N | 076 33 14 W |
| Lereley | Populated Place | 43 | Baltimore | 39 24 20 N | 076 24 09 W |
| Leslie | Populated Place | 53 | Cecil | 39 37 10 N | 075 57 04 W |
| Lester Acres | Populated Place | 257 | Carroll | 39 36 32 N | 076 54 06 W |
| Letha Ponds | Lake | 3 | Anne Arundel | 39 08 44 N | 076 27 36 W |
| Letter Cove | Bay | -3 | Somerset | 38 08 16 N | 075 51 51 W |
| Letter Creek | Stream | | Somerset | 38 08 25 N | 075 51 46 W |
| Lettie Marshall Dent Elementary School | School | 50 | St. Mary's | 38 28 25 N | 076 46 03 W |
| Level | Populated Place | 135 | Harford | 39 34 49 N | 076 11 36 W |
| Level Terrace | Populated Place | 139 | Harford | 39 34 33 N | 076 12 17 W |
| Level Volunteer Fire Company | Building | | Harford | 39 58 38 N | 076 20 14 W |
| Levering Creek | Bay | 5 | Somerset | 37 59 24 N | 076 01 31 W |
| Levindale Home | Locale | 130 | Baltimore (city) | 39 21 15 N | 076 39 54 W |
| Lewis Corner | Populated Place | 3 | Worcester | 38 17 24 N | 075 09 04 W |
| Lewis Creek | Bay | 7 | St. Mary's | 38 18 28 N | 076 28 46 W |
| Lewis House | Building | | Baltimore | 39 24 21 N | 076 35 33 W |
| Lewis J. Ort Library | Building | | Allegany | 39 39 03 N | 078 56 03 W |
| Lewis Knob | Summit | 903 | Garrett | 39 31 31 N | 079 28 12 W |
| Lewis Landing | Populated Place | 1 | Dorchester | 38 24 50 N | 075 51 04 W |
| Lewis Mill | Populated Place | 96 | Frederick | 39 22 21 N | 077 33 34 W |
| Lewis Mill Branch | Stream | | Frederick | 39 22 21 N | 077 33 35 W |
| Lewisdale | Populated Place | 196 | Montgomery | 39 17 10 N | 077 15 40 W |
| Lewisdale | Populated Place | 23 | Prince George's | 38 58 24 N | 076 58 26 W |
| Lewisdale Elementary School | School | 18 | Prince George's | 38 58 29 N | 076 58 05 W |
| Lewisdale Estates | Populated Place | 129 | Frederick | 39 31 30 N | 077 25 03 W |
| Lewiston | Populated Place | 77 | Prince George's | 39 01 43 N | 076 57 36 W |
| Lewistown | Populated Place | 122 | Frederick | 39 32 15 N | 077 24 56 W |
| Lewistown | Populated Place | 12 | Talbot | 38 50 42 N | 075 56 52 W |
| Lewistown Elementary School | School | 124 | Frederick | 39 32 23 N | 077 24 57 W |
| Lewistown Fire Company Number 22 | Building | | Frederick | 39 33 18 N | 077 36 15 W |
| Lewistown Mill (historical) | Locale | 116 | Frederick | 39 32 08 N | 077 24 53 W |
| Lewistown State Fish Hatchery | Locale | 150 | Frederick | 39 32 04 N | 077 26 38 W |
| Lexington Market | Locale | 26 | Baltimore (city) | 39 17 28 N | 076 37 19 W |
| Lexington Park | Populated Place | 35 | St. Mary's | 38 16 00 N | 076 27 14 W |
| Lexington Park Branch Library | Building | 34 | St. Mary's | 38 15 52 N | 076 27 07 W |
| Lexington Park Elementary School | School | 29 | St. Mary's | 38 15 37 N | 076 27 27 W |
| Lexington Park Post Office | Post Office | 34 | St. Mary's | 38 15 55 N | 076 27 27 W |
| Lexington Park Volunteer Rescue Squad Company 38 | Building | | St. Mary's | 38 28 09 N | 076 48 31 W |
| Lexington Park Volunteer Rescue Squad Company 39 | Building | | St. Mary's | 38 26 16 N | 076 46 37 W |
| Lexington Run (subdivision) | Populated Place | 161 | Carroll | 39 22 05 N | 076 58 49 W |
| Lexington Street Mall Shopping Center | Locale | 19 | Baltimore (city) | 39 17 31 N | 076 37 05 W |
| Lexington Terrace Elementary School | School | 24 | Baltimore (city) | 39 17 28 N | 076 37 42 W |
| Liberia Church | Church | 1 | Somerset | 38 01 47 N | 075 43 27 W |
| Liberty Baptist Church | Church | 224 | Howard | 39 21 06 N | 077 04 50 W |
| Liberty Church | Church | 12 | Wicomico | 38 22 28 N | 075 34 10 W |
| Liberty Court Shopping Center | Locale | 161 | Baltimore | 39 21 48 N | 076 46 47 W |
| Liberty Dam | Dam | 128 | Baltimore | 39 22 36 N | 076 53 27 W |
| Liberty Dam | Dam | 129 | Baltimore | 39 22 36 N | 076 53 26 W |
| Liberty Elementary School | School | 125 | Baltimore (city) | 39 19 33 N | 076 41 01 W |
| Liberty Elementary School | School | 177 | Frederick | 39 29 01 N | 077 15 11 W |
| Liberty Forest | Populated Place | 192 | Frederick | 39 30 34 N | 077 15 59 W |
| Liberty Grace Church of God | Church | 125 | Baltimore (city) | 39 19 36 N | 076 40 40 W |
| Liberty Grove | Populated Place | 53 | Cecil | 39 39 21 N | 076 07 12 W |
| Liberty Grove School House (historical) | School | 53 | Cecil | 39 39 23 N | 076 07 05 W |
| Liberty Grove United Methodist Church | Church | 147 | Montgomery | 39 06 23 N | 076 56 13 W |
| Liberty Heights | Populated Place | 158 | Montgomery | 39 10 17 N | 077 16 30 W |
| Liberty Knolls | Populated Place | 154 | Frederick | 39 29 00 N | 077 13 48 W |
| Liberty Lake | Reservoir | 129 | Baltimore | 39 22 36 N | 076 53 26 W |
| Liberty Lake Hills | Populated Place | 148 | Carroll | 39 24 15 N | 076 54 15 W |
| Liberty Lighthouse Church | Church | 6 | Queen Anne's | 39 12 15 N | 076 02 48 W |
| Liberty Manor | Populated Place | 157 | Baltimore | 39 21 23 N | 076 47 15 W |
| Liberty Manor | Populated Place | 160 | Carroll | 39 24 36 N | 076 54 34 W |
| Liberty Medical Center | Hospital | 98 | Baltimore (city) | 39 19 17 N | 076 39 32 W |
| Liberty Medical Center | Hospital | | Baltimore (city) | 39 19 17 N | 076 39 32 W |
| Liberty Plaza Shopping Center | Locale | 166 | Baltimore | 39 21 57 N | 076 46 55 W |