| City Name | County | Zip Code |
| La Plata | Charles | 20646 |
| Ladiesburg | Frederick | 21759 |
| Lake Linganore | Frederick | 21774 |
| Lake Shore | Anne Arundel | 21122 |
| Landover | Prince George's | 20785 |
| Landover Hills | Prince George's | ***** |
| Langley Park | Prince George's | ***** |
| Lanham | Prince George's | ***** |
| Lanham Seabrook | Prince George's | ***** |
| Lantz | Frederick | 21780 |
| Lappans | Washington | 21733 |
| Largo | Prince George's | 20772 |
| Laurel | Prince George's | 20697 |
| Lavale | Allegany | 21504 |
| Laytonsville | Montgomery | ***** |
| Leonardtown | Saint Mary's | 20650 |
| Lewistown | Frederick | 21701 |
| Lexington Park | Saint Mary's | 20653 |
| Libertytown | Frederick | 21762 |
| Lime Kiln | Frederick | 21701 |
| Lineboro | Carroll | 21088 |
| Linthicum Heights | Anne Arundel | 21090 |
| Linwood | Carroll | 21764 |
| Lisbon | Howard | 21765 |
| Loch Raven | Baltimore | 21286 |
| Lonaconing | Allegany | 21539 |
| Long Green | Baltimore | 21092 |
| Lothian | Anne Arundel | 20711 |
| Loveville | Saint Mary's | 20656 |
| Luke | Allegany | 21540 |
| Lusby | Calvert | 20657 |
| Lutherville | Baltimore | ***** |
| Lutherville Timonium | Baltimore | ***** |
| Lynch | Kent | 21646 |
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