Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Mondawmin Mall Shopping Center | Locale | 89 | Baltimore (city) | 39 19 02 N | 076 39 19 W |
| Mondays Creek | Bay | 0 | Prince George's | 38 47 11 N | 076 42 32 W |
| Mondell | Populated Place | 103 | Washington | 39 29 39 N | 077 45 43 W |
| Money Creek | Stream | | Cecil | 39 22 21 N | 075 58 36 W |
| Money Land Fishery | Locale | -6 | Cecil | 39 27 39 N | 076 00 20 W |
| Moneystump Swamp | Swamp | 0 | Dorchester | 38 26 25 N | 076 12 58 W |
| Mongrel Neck | Cape | 1 | Somerset | 38 11 29 N | 075 50 33 W |
| Monie | Populated Place | 1 | Somerset | 38 11 13 N | 075 49 14 W |
| Monie Bay | Bay | -3 | Somerset | 38 13 22 N | 075 50 16 W |
| Monie Creek | Stream | | Somerset | 38 13 49 N | 075 49 20 W |
| Monie Island | Island | 1 | Somerset | 38 13 41 N | 075 51 10 W |
| Monie Marsh | Swamp | 0 | Somerset | 38 13 01 N | 075 49 06 W |
| Monie Neck | Cape | 2 | Somerset | 38 13 00 N | 075 47 34 W |
| Monie Point | Cape | 1 | Somerset | 38 13 36 N | 075 51 06 W |
| Monie Post Office | Post Office | 1 | Somerset | 38 11 13 N | 075 49 15 W |
| Monkey Lodge Hill | Summit | 832 | Garrett | 39 30 22 N | 079 14 22 W |
| Monks Creek | Stream | | Harford | 39 25 42 N | 076 15 06 W |
| Monks Island | Island | 3 | Harford | 39 21 44 N | 076 13 56 W |
| Monks Misery | Populated Place | 197 | Carroll | 39 24 18 N | 077 00 57 W |
| Monkton | Populated Place | 99 | Baltimore | 39 34 43 N | 076 36 56 W |
| Monkton Farms | Populated Place | 147 | Baltimore | 39 33 25 N | 076 36 29 W |
| Monkton Post Office | Post Office | 103 | Baltimore | 39 34 44 N | 076 36 54 W |
| Monkton United Methodist Church | Church | 122 | Baltimore | 39 34 40 N | 076 36 47 W |
| Monocacy (historical) | Populated Place | 72 | Montgomery | 39 12 40 N | 077 27 54 W |
| Monocacy Aqueduct | Locale | 59 | Montgomery | 39 13 26 N | 077 27 07 W |
| Monocacy Cemetery | Cemetery | 140 | Frederick | 39 36 22 N | 077 19 04 W |
| Monocacy Cemetery | Cemetery | 149 | Montgomery | 39 10 48 N | 077 24 58 W |
| Monocacy Church | Church | 159 | Montgomery | 39 10 47 N | 077 24 53 W |
| Monocacy Church of the Brethren | Church | 140 | Frederick | 39 36 22 N | 077 19 06 W |
| Monocacy Elementary School | School | 97 | Frederick | 39 27 23 N | 077 24 44 W |
| Monocacy Elementary School | School | 140 | Montgomery | 39 13 27 N | 077 23 34 W |
| Monocacy Farms | Locale | 131 | Carroll | 39 41 17 N | 077 13 11 W |
| Monocacy Island | Island | 1 | Harford | 39 23 12 N | 076 13 29 W |
| Monocacy Meadows | Populated Place | 98 | Frederick | 39 31 32 N | 077 21 18 W |
| Monocacy Middle School | School | 101 | Frederick | 39 27 17 N | 077 24 48 W |
| Monocacy National Battlefield | Park | 72 | Frederick | 39 23 00 N | 077 22 59 W |
| Monocacy Natural Resources Area | Park | 87 | Frederick | 39 14 41 N | 077 25 34 W |
| Monocacy Overlook | Populated Place | 97 | Frederick | 39 18 20 N | 077 25 09 W |
| Monocacy Pine Cliff Park | Park | 77 | Frederick | 39 23 26 N | 077 22 32 W |
| Monocacy River | Stream | | Frederick | 39 13 22 N | 077 27 15 W |
| Monocacy Village (subdivision) | Populated Place | 91 | Frederick | 39 25 33 N | 077 24 03 W |
| Monocacy Village Park | Park | 86 | Frederick | 39 25 45 N | 077 24 04 W |
| Monocacy Village Shopping Center | Locale | 92 | Frederick | 39 25 35 N | 077 24 11 W |
| Monroe Gardens | Populated Place | 21 | Anne Arundel | 39 09 12 N | 076 37 34 W |
| Monroe Run | Stream | | Garrett | 39 32 58 N | 079 08 40 W |
| Monroe Street United Methodist Church | Church | 30 | Baltimore (city) | 39 16 58 N | 076 38 49 W |
| Monrovia | Populated Place | 126 | Frederick | 39 22 19 N | 077 16 19 W |
| Monrovia Post Office | Post Office | 159 | Frederick | 39 21 20 N | 077 16 09 W |
| Montaine | Populated Place | 40 | Charles | 38 31 15 N | 077 08 45 W |
| Montclare | Populated Place | 252 | Carroll | 39 27 19 N | 077 01 44 W |
| Montebello Park | Populated Place | 65 | Baltimore (city) | 39 20 33 N | 076 34 07 W |
| Montebello Presbyterian Church | Church | 73 | Baltimore (city) | 39 19 32 N | 076 35 20 W |
| Montebello School | School | 63 | Baltimore (city) | 39 19 40 N | 076 35 06 W |
| Montebello Waste Water Lake | Reservoir | 56 | Baltimore (city) | 39 20 12 N | 076 34 59 W |
| Montebello Waste Water Lake Dam | Dam | 56 | Baltimore (city) | 39 20 12 N | 076 34 59 W |
| Montecito Business Center | Locale | 151 | Frederick | 39 17 58 N | 077 19 39 W |
| Montego Bay (subdivision) | Populated Place | 0 | Worcester | 38 26 21 N | 075 03 30 W |
| Montego Bay Mobile Home Park (subdivision) | Populated Place | 0 | Worcester | 38 26 18 N | 075 04 01 W |
| Montego Bay Shopping Center | Locale | 1 | Worcester | 38 26 03 N | 075 03 20 W |
| Montego Station Ocean City Post Office | Post Office | 2 | Worcester | 38 26 08 N | 075 03 17 W |
| Monteith (historical) | Populated Place | 56 | Prince George's | 39 02 24 N | 076 52 45 W |
| Montel | Populated Place | 552 | Allegany | 39 37 35 N | 078 53 53 W |
| Monterrey Village | Populated Place | 126 | Montgomery | 39 02 36 N | 077 03 27 W |
| Montessori School of Columbia | School | 104 | Howard | 39 12 04 N | 076 51 10 W |
| Montessori School of North Laurel | School | 49 | Howard | 39 06 33 N | 076 50 22 W |
| Montevideo | Populated Place | 47 | Anne Arundel | 39 09 45 N | 076 46 01 W |
| Montevue Hospital | Hospital | 98 | Frederick | 39 25 53 N | 077 26 17 W |
| Montevue Station (historical) | Locale | 97 | Frederick | 39 25 55 N | 077 26 04 W |
| Montford Glen | Populated Place | 149 | Harford | 39 33 05 N | 076 25 49 W |
| Montgomery Blair High School | School | 85 | Montgomery | 39 00 01 N | 077 00 56 W |
| Montgomery Chapel | Church | 171 | Montgomery | 39 16 08 N | 077 18 22 W |
| Montgomery Chapel Cemetery | Cemetery | 224 | Montgomery | 39 19 08 N | 077 11 55 W |
| Montgomery College | School | 131 | Montgomery | 39 05 52 N | 077 09 34 W |
| Montgomery College Germantown Campus | School | 168 | Montgomery | 39 11 10 N | 077 14 51 W |
| Montgomery Community Church | Church | 150 | Montgomery | 39 10 08 N | 077 07 03 W |
| Montgomery Country Club | Locale | 169 | Montgomery | 39 12 06 N | 077 07 39 W |
| Montgomery County | Civil | 146 | Montgomery | 39 09 00 N | 077 11 59 W |
| Montgomery County Airpark | Airport | 152 | Montgomery | 39 10 05 N | 077 09 57 W |
| Montgomery County Airpark Industrial Park | Locale | 148 | Montgomery | 39 10 19 N | 077 09 49 W |
| Montgomery County Board of Elections | Building | 101 | Montgomery | 39 04 57 N | 077 06 50 W |
| Montgomery County Courthouse | Building | 136 | Montgomery | 39 05 01 N | 077 09 08 W |
| Montgomery County Department of Transportation | Building | 125 | Montgomery | 39 03 57 N | 077 09 33 W |
| Montgomery County Golf Course | Locale | 170 | Montgomery | 39 12 06 N | 077 07 40 W |
| Montgomery County Jail | Building | 127 | Montgomery | 39 03 58 N | 077 09 34 W |
| Montgomery County Maintenance Yard | Locale | 66 | Montgomery | 38 59 55 N | 077 03 35 W |
| Montgomery County Parks Headquarters | Building | 88 | Montgomery | 39 00 40 N | 077 01 29 W |
| Montgomery County Sheriffs Department | Building | | Montgomery | 39 08 39 N | 077 15 08 W |
| Montgomery County Solid Waste Transfer Station | Locale | 149 | Montgomery | 39 07 16 N | 077 10 29 W |
| Montgomery General Hospital | Hospital | 153 | Montgomery | 39 09 01 N | 077 03 30 W |
| Montgomery Hills | Populated Place | 106 | Montgomery | 39 00 38 N | 077 02 52 W |
| Montgomery Hills Baptist Church | Church | 110 | Montgomery | 39 00 54 N | 077 02 31 W |
| Montgomery Hills Junior High School | School | 115 | Montgomery | 39 00 29 N | 077 02 42 W |
| Montgomery Hills Park | Park | 113 | Montgomery | 39 00 36 N | 077 02 41 W |
| Montgomery Hollow | Valley | | Allegany | 39 32 25 N | 078 29 01 W |
| Montgomery Industrial Park | Locale | 113 | Montgomery | 39 03 17 N | 076 58 10 W |
| Montgomery Junior College | School | 96 | Montgomery | 38 59 02 N | 077 01 14 W |
| Montgomery Knolls | Populated Place | 120 | Howard | 39 14 15 N | 076 48 24 W |
| Montgomery Knolls | Populated Place | 89 | Montgomery | 39 00 35 N | 076 59 44 W |
| Montgomery Knolls Elementary School | School | 80 | Montgomery | 39 00 21 N | 076 59 37 W |
| Montgomery Mall Shopping Center | Locale | 92 | Montgomery | 39 01 27 N | 077 08 50 W |
| Montgomery Manor | Populated Place | 72 | Howard | 39 12 43 N | 076 44 01 W |
| Montgomery Run | Populated Place | 141 | Howard | 39 13 04 N | 076 48 14 W |
| Montgomery Square | Populated Place | 118 | Montgomery | 39 03 18 N | 077 10 01 W |
| Montgomery United Methodist Church | Church | 226 | Montgomery | 39 19 07 N | 077 11 55 W |
| Montgomery Village | Populated Place | 113 | Montgomery | 39 10 36 N | 077 11 43 W |
| Montgomery Village Golf Course | Locale | 132 | Montgomery | 39 11 02 N | 077 11 50 W |
| Montgomery Village Middle School | School | 132 | Montgomery | 39 10 22 N | 077 12 34 W |
| Montgomery Village Off-Price Shopping Center | Locale | 143 | Montgomery | 39 09 17 N | 077 11 59 W |
| Montgomery Village Post Office | Post Office | 134 | Montgomery | 39 10 21 N | 077 12 24 W |
| Montgomery Woods | Populated Place | 67 | Howard | 39 12 33 N | 076 44 00 W |