| City Name | County | Zip Code |
| Maddox | Saint Mary's | 20621 |
| Madison | Dorchester | ***** |
| Magnolia | Harford | 21101 |
| Magothy Beach | Anne Arundel | 21122 |
| Manchester | Carroll | ***** |
| Manokin | Somerset | 21836 |
| Marbury | Charles | 20658 |
| Mardela Springs | Wicomico | 21837 |
| Marion Station | Somerset | 21838 |
| Marriottsville | Howard | 21104 |
| Marshall Hall | Charles | 20616 |
| Marston | Carroll | 21776 |
| Marydel | Caroline | 21649 |
| Maryland City | Anne Arundel | 20724 |
| Maryland Line | Baltimore | 21105 |
| Massey | Kent | 21650 |
| Maugansville | Washington | 21767 |
| Mayberry | Carroll | 21158 |
| Mayo | Anne Arundel | 21106 |
| McDaniel | Talbot | 21647 |
| McHenry | Garrett | 21541 |
| McCoole | Allegany | 21562 |
| Mechanicsville | Saint Mary's | 20659 |
| Medford | Carroll | 21776 |
| Melrose | Carroll | 21102 |
| Middle River | Baltimore | 21220 |
| Middleburg | Carroll | 21757 |
| Middletown | Frederick | 21769 |
| Midland | Allegany | 21542 |
| Midlothian | Allegany | 21543 |
| Millers | Carroll | 21107 |
| Millersville | Anne Arundel | 21108 |
| Millington | Kent | 21651 |
| Mitchellville | Prince George's | ***** |
| Monkton | Baltimore | 21111 |
| Morovia | Frederick | 21770 |
| Montgomery Village | Montgomery | ***** |
| Montpelier | Prince George's | ***** |
| Morganza | Saint Mary's | 20660 |
| Morningside | Prince George's | 20746 |
| Mount Airy | Carroll | 21771 |
| Mount Lena | Washington | 21713 |
| Mount Rainier | Prince George's | ***** |
| Mount Savage | Allegany | 21545 |
| Mount Victoria | Charles | 20661 |
| Mountain Lake Park | Garrett | 21550 |
| Mountaindale | Frederick | 21788 |
| Myersville | Frederick | 21773 |
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