| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Mar-Lu-Ridge Vista | city | Maryland | United States | 39.34 | -77.51 | 410 | |
| Marabrooke | city | Maryland | United States | 39.01 | -76.55 | 62 | |
| Marbella | city | Maryland | United States | 38.65 | -76.89 | 196 | |
| Marbeth Hill | city | Maryland | United States | 39.58 | -77.01 | 830 | |
| Marble Hill | city | Maryland | United States | 39.50 | -76.65 | 255 | |
| Marble Hill | city | Maryland | United States | 39.20 | -76.74 | 147 | |
| Marbury | city | Maryland | United States | 38.58 | -77.16 | 88 | |
| Mardela Springs | city | Maryland | United States | 38.46 | -75.76 | 16 | |
| Mardella Run | city | Maryland | United States | 39.36 | -76.82 | 403 | |
| Margate | city | Maryland | United States | 39.17 | -76.60 | 3 | |
| Margate | city | Maryland | United States | 39.49 | -76.44 | 830 | |
| Maria Acres | city | Maryland | United States | 38.40 | -75.52 | 52 | |
| Mariellen Park | city | Maryland | United States | 38.51 | -76.95 | 147 | |
| Marine Oak Village | city | Maryland | United States | 39.32 | -76.45 | 3 | |
| Mariners | city | Maryland | United States | 37.99 | -75.83 | 3 | |
| Mariners Cove | city | Maryland | United States | 39.56 | -75.87 | 3 | |
| Mariners Cove | city | Maryland | United States | 38.99 | -76.51 | 49 | |
| Mariners Point | city | Maryland | United States | 38.96 | -76.48 | 19 | |
| Maring Manor | city | Maryland | United States | 39.60 | -77.07 | 830 | |
| Marion | city | Maryland | United States | 38.04 | -75.77 | 6 | |
| Marion Oaks | city | Maryland | United States | 38.70 | -76.57 | 98 | |
| Market Quay | city | Maryland | United States | 38.98 | -76.50 | 3 | |
| Market Square North | city | Maryland | United States | 39.30 | -76.86 | 830 | |
| Market Square South | city | Maryland | United States | 39.30 | -76.87 | 830 | |
| Marlboro Hills | city | Maryland | United States | 38.66 | -76.61 | 147 | |
| Marlboro Meadows | city | Maryland | United States | 38.84 | -76.71 | 52 | |
| Marley | city | Maryland | United States | 39.15 | -76.59 | 49 | |
| Marley Heights | city | Maryland | United States | 39.15 | -76.59 | 49 | |
| Marley Park Beach | city | Maryland | United States | 39.16 | -76.60 | 45 | |
| Marley Run | city | Maryland | United States | 39.13 | -76.59 | 78 | |
| Marley Village | city | Maryland | United States | 39.63 | -75.88 | 98 | |
| Marling Farms | city | Maryland | United States | 38.93 | -76.27 | 3 | |
| Marlow Heights | city | Maryland | United States | 38.83 | -76.95 | 249 | |
| Marlton | city | Maryland | United States | 38.77 | -76.79 | 157 | |
| Marlton South | city | Maryland | United States | 38.75 | -76.78 | 144 | |
| Marlywood | city | Maryland | United States | 39.40 | -76.62 | 364 | |
| Marriott Hill | city | Maryland | United States | 38.88 | -76.61 | 147 | |
| Marriottsville | city | Maryland | United States | 39.35 | -76.90 | 830 | |
| Mars Estates | city | Maryland | United States | 39.32 | -76.45 | 3 | |
| Marshalee Estates | city | Maryland | United States | 39.21 | -76.76 | 200 | |
| Marshalls Corner | city | Maryland | United States | 38.55 | -77.04 | 147 | |
| Marshope | city | Maryland | United States | 38.48 | -77.19 | 98 | |
| Marshyhope Village | city | Maryland | United States | 38.62 | -75.82 | 13 | |
| Marston | city | Maryland | United States | 39.51 | -77.10 | 830 | |
| Marthas Legacy | city | Maryland | United States | 39.46 | -76.93 | 830 | |
| Martin | city | Maryland | United States | 39.38 | -77.31 | 830 | |
| Martin Manor | city | Maryland | United States | 39.42 | -76.30 | 29 | |
| Martindale | city | Maryland | United States | 39.58 | -76.37 | 830 | |
| Martindale | city | Maryland | United States | 39.14 | -76.60 | 49 | |
| Martingham | city | Maryland | United States | 38.81 | -76.23 | 3 | |
| Martins Addition | city | Maryland | United States | 38.98 | -77.07 | 275 | |
| Martins Additions | city | Maryland | United States | 38.98 | -77.07 | 275 | |
| Martins Choice | city | Maryland | United States | 39.39 | -76.64 | 288 | |
| Martins Corner | city | Maryland | United States | 38.30 | -75.80 | 6 | |
| Martins Cove Farm | city | Maryland | United States | 39.00 | -76.47 | 3 | |
| Martins Crossroads | city | Maryland | United States | 39.68 | -77.79 | 830 | |
| Martinsburg | city | Maryland | United States | 39.16 | -77.48 | 400 | |
| Marumsco | city | Maryland | United States | 38.01 | -75.68 | 3 | |
| Marvania Heights | city | Maryland | United States | 39.72 | -78.12 | 830 | |
| Marwood | city | Maryland | United States | 39.15 | -76.59 | 49 | |
| Mary E White Estate | city | Maryland | United States | 38.76 | -76.66 | 98 | |
| Marydel | city | Maryland | United States | 39.11 | -75.75 | 49 | |
| Marydell | city | Maryland | United States | 39.29 | -76.83 | 830 | |
| Maryland Beach | city | Maryland | United States | 39.15 | -76.46 | 3 | |
| Maryland City | city | Maryland | United States | 39.09 | -76.82 | 193 | |
| Maryland Gardens | city | Maryland | United States | 38.48 | -76.51 | 98 | |
| Maryland Line | city | Maryland | United States | 39.71 | -76.65 | 830 | |
| Maryland Manor | city | Maryland | United States | 38.29 | -76.50 | 98 | |
| Maryland Mobile Estates | city | Maryland | United States | 38.86 | -76.68 | 49 | |
| Maryland Park | city | Maryland | United States | 38.89 | -76.91 | 147 | |
| Maryland Point | city | Maryland | United States | 38.40 | -77.20 | 49 | |
| Maryland Ponderosa | city | Maryland | United States | 39.52 | -76.35 | 288 | |
| Marymount | city | Maryland | United States | 39.02 | -77.13 | 347 | |
| Marys Choice | city | Maryland | United States | 39.34 | -76.44 | 3 | |
| Maryvale | city | Maryland | United States | 38.80 | -76.81 | 164 | |
| Marywood | city | Maryland | United States | 39.55 | -76.37 | 406 |