Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Martins Choice | Populated Place | 114 | Baltimore | 39 23 13 N | 076 38 18 W |
| Martins Corner | Populated Place | 2 | Wicomico | 38 17 49 N | 075 47 48 W |
| Martins Cove | Bay | 0 | Anne Arundel | 39 00 08 N | 076 27 33 W |
| Martins Cove Farm | Populated Place | 24 | Anne Arundel | 39 00 15 N | 076 28 12 W |
| Martins Crossroads | Populated Place | 145 | Washington | 39 40 53 N | 077 47 23 W |
| Martins Mill (historical) | Locale | 116 | Frederick | 39 35 11 N | 077 20 30 W |
| Martins Pond | Bay | 3 | Anne Arundel | 39 00 35 N | 076 31 07 W |
| Martinsburg | Populated Place | 122 | Montgomery | 39 09 51 N | 077 28 32 W |
| Marty Snook County Park | Park | 175 | Washington | 39 36 28 N | 077 45 51 W |
| Martz Center | Building | | Frederick | 39 42 31 N | 077 42 11 W |
| Martz Hall | Building | | Frederick | 39 42 41 N | 077 42 11 W |
| Marumsco | Populated Place | 1 | Somerset | 38 00 28 N | 075 41 05 W |
| Marumsco Creek | Stream | | Somerset | 37 58 05 N | 075 42 49 W |
| Marumsco Marsh | Swamp | 1 | Somerset | 37 58 43 N | 075 41 07 W |
| Marvania Heights | Populated Place | 239 | Washington | 39 43 15 N | 078 07 00 W |
| Marvin Chapel Cemetery | Cemetery | 206 | Frederick | 39 22 28 N | 077 12 26 W |
| Marvin Chapel Methodist Church | Church | 209 | Frederick | 39 22 29 N | 077 12 24 W |
| Marvin Memorial United Methodist Church | Church | 101 | Montgomery | 39 01 10 N | 077 01 46 W |
| Marvin Memorial United Methodist Church | Church | 21 | Queen Anne's | 39 08 38 N | 075 51 45 W |
| Marwood | Populated Place | 17 | Anne Arundel | 39 08 47 N | 076 35 26 W |
| Mary E Rodman Elementary School | School | 69 | Baltimore (city) | 39 17 31 N | 076 40 37 W |
| Mary E White Estate | Populated Place | 28 | Calvert | 38 45 23 N | 076 39 24 W |
| Mary Fisher Hall | Building | 134 | Baltimore | 39 24 30 N | 076 35 33 W |
| Mary Fisher Hall | Building | | Baltimore | 39 24 31 N | 076 35 34 W |
| Mary Harris Mother Jones Elementary School | School | 49 | Prince George's | 39 00 04 N | 076 57 59 W |
| Mary Meletia Hall | Building | 111 | Baltimore (city) | 39 21 07 N | 076 37 19 W |
| Marydel | Populated Place | 18 | Caroline | 39 06 46 N | 075 44 45 W |
| Marydel Post Office | Post Office | 19 | Caroline | 39 06 43 N | 075 44 47 W |
| Marydell | Populated Place | 148 | Howard | 39 17 34 N | 076 49 57 W |
| Maryland Airport | Airport | 49 | Charles | 38 36 01 N | 077 04 24 W |
| Maryland Beach | Beach | 2 | Worcester | 38 26 48 N | 075 02 60 W |
| Maryland Beach | Populated Place | 3 | Anne Arundel | 39 08 51 N | 076 27 38 W |
| Maryland City | Populated Place | 63 | Anne Arundel | 39 05 31 N | 076 49 04 W |
| Maryland City Branch Library | Building | 78 | Anne Arundel | 39 05 51 N | 076 48 41 W |
| Maryland City Elementary School | School | 62 | Anne Arundel | 39 05 45 N | 076 49 04 W |
| Maryland City Fire Company 27 | Building | | Anne Arundel | 39 06 03 N | 076 49 09 W |
| Maryland City Free Methodist Church | Church | | Anne Arundel | 39 05 45 N | 076 49 33 W |
| Maryland City Park | Park | 49 | Anne Arundel | 39 05 05 N | 076 49 10 W |
| Maryland City Plaza Shopping Center | Locale | 74 | Anne Arundel | 39 05 53 N | 076 48 44 W |
| Maryland City Volunteer Fire Company Company 27 | Building | | Anne Arundel | 39 10 15 N | 077 22 31 W |
| Maryland College of Arts and Design | Building | 103 | Montgomery | 39 01 38 N | 077 02 51 W |
| Maryland Correctional Institute for Women | Locale | 56 | Anne Arundel | 39 07 51 N | 076 46 31 W |
| Maryland Correctional Institution-Hagerstown | Locale | 150 | Washington | 39 33 35 N | 077 43 05 W |
| Maryland Correctional Training Center | Locale | 155 | Washington | 39 33 53 N | 077 42 54 W |
| Maryland Country Club | Locale | 106 | Harford | 39 31 30 N | 076 18 19 W |
| Maryland Court of Appeals | Building | 12 | Anne Arundel | 38 58 46 N | 076 29 30 W |
| Maryland Department of State Police | Building | | Calvert | 39 37 45 N | 077 12 30 W |
| Maryland Department of State Police | Building | | Frederick | 39 37 46 N | 077 12 31 W |
| Maryland Gardens | Populated Place | 38 | Calvert | 38 28 37 N | 076 30 33 W |
| Maryland General Hospital | Hospital | 36 | Baltimore (city) | 39 17 55 N | 076 37 14 W |
| Maryland Heights | Summit | 436 | Washington | 39 20 27 N | 077 42 59 W |
| Maryland House of Correction | Locale | 62 | Anne Arundel | 39 08 35 N | 076 46 39 W |
| Maryland Institute College of Art | School | 37 | Baltimore (city) | 39 18 27 N | 076 37 19 W |
| Maryland Institute for Emergency Medical Heliport | Airport | 17 | Baltimore | 39 17 19 N | 076 37 33 W |
| Maryland International Raceway | Locale | 43 | St. Mary's | 38 23 50 N | 076 50 23 W |
| Maryland Line | Populated Place | 257 | Baltimore | 39 42 51 N | 076 39 14 W |
| Maryland Line United Methodist Church | Church | 258 | Baltimore | 39 42 50 N | 076 39 14 W |
| Maryland Line Volunteer Fire Protective Association Station 45 | Building | | Baltimore | 40 12 20 N | 077 05 55 W |
| Maryland Manor | Populated Place | 32 | St. Mary's | 38 17 36 N | 076 30 09 W |
| Maryland Manor Nursing Home | Hospital | 14 | Anne Arundel | 39 09 10 N | 076 35 01 W |
| Maryland Manor Trailer Park | Populated Place | 14 | Anne Arundel | 38 51 30 N | 076 40 59 W |
| Maryland Marine Police Academy | School | 3 | Queen Anne's | 38 57 16 N | 076 21 16 W |
| Maryland Mine | Mine | 116 | Montgomery | 38 59 44 N | 077 13 54 W |
| Maryland Monument | Park | 152 | Washington | 39 28 31 N | 077 44 47 W |
| Maryland National Veterans Cemetery | Cemetery | 181 | Baltimore | 39 26 06 N | 076 45 45 W |
| Maryland Noname 2 Lake | Reservoir | 1 | Wicomico | 38 17 00 N | 075 41 17 W |
| Maryland Noname 3 Dam | Dam | 3 | Dorchester | 38 40 30 N | 075 52 59 W |
| Maryland Noname 3 Reservoir | Reservoir | 3 | Dorchester | 38 40 30 N | 075 52 59 W |
| Maryland Park | Populated Place | 30 | Prince George's | 38 53 18 N | 076 54 25 W |
| Maryland Park Junior High School | School | 35 | Prince George's | 38 53 28 N | 076 54 33 W |
| Maryland Point | Cape | -6 | Charles | 38 21 36 N | 077 12 25 W |
| Maryland Point | Populated Place | 26 | Charles | 38 23 51 N | 077 12 18 W |
| Maryland Polo Club | Locale | 175 | Harford | 39 35 13 N | 076 30 26 W |
| Maryland Ponderosa | Populated Place | 103 | Harford | 39 30 56 N | 076 21 16 W |
| Maryland Rifle Range (historical) | Locale | 18 | Anne Arundel | 39 09 00 N | 076 36 54 W |
| Maryland School for the Blind | School | 84 | Baltimore (city) | 39 21 49 N | 076 32 03 W |
| Maryland School for the Deaf | School | 110 | Howard | 39 12 25 N | 076 47 42 W |
| Maryland Science Center and Planetarium | Building | 3 | Baltimore (city) | 39 16 53 N | 076 36 43 W |
| Maryland Sheriffs Boys Ranch | Locale | 142 | Frederick | 39 20 14 N | 077 23 20 W |
| Maryland Springs School (historical) | School | 35 | St. Mary's | 38 20 27 N | 076 40 33 W |
| Maryland State Fair Grounds | Locale | 121 | Baltimore | 39 26 40 N | 076 37 48 W |
| Maryland State Game Farm (historical) | Locale | 9 | Wicomico | 38 23 03 N | 075 35 59 W |
| Maryland State Police | Building | | Caroline | 39 14 43 N | 076 07 07 W |
| Maryland State Police | Building | | Charles | 38 56 59 N | 077 38 29 W |
| Maryland State Police | Building | | Queen Anne's | 39 03 25 N | 076 02 30 W |
| Maryland State Police | Building | | St. Mary's | 38 30 44 N | 077 03 06 W |
| Maryland State Police - Region III - Waterloo Barrack A | Building | 68 | Howard | 39 10 22 N | 076 46 47 W |
| Maryland State Police Academy | School | 154 | Baltimore | 39 22 32 N | 076 43 20 W |
| Maryland State Police Barrack U | Building | | Calvert | 38 54 16 N | 076 58 11 W |
| Maryland State Police Barracks | Building | | Cecil | 39 59 47 N | 076 07 30 W |
| Maryland State Police Barracks F North East | Building | | Cecil | 40 01 23 N | 076 35 03 W |
| Maryland State Police Glen Burnie Barrack Heliport | Airport | 24 | Anne Arundel | 39 09 58 N | 076 38 37 W |
| Maryland State Police Headquarters | Building | | Wicomico | 39 37 50 N | 077 12 30 W |
| Maryland State Police Headquarters | Building | | Wicomico | 39 37 50 N | 077 12 30 W |
| Maryland State Police Westminster Barrack | Building | | Carroll | 39 55 39 N | 077 36 07 W |
| Maryland State Training School for Boys | School | 112 | Baltimore | 39 25 32 N | 076 31 24 W |
| Maryland Training School for Girls (historical) | School | 28 | Anne Arundel | 39 09 31 N | 076 39 30 W |
| Maryland Veterans Cemetery | Cemetery | 25 | Anne Arundel | 39 03 55 N | 076 35 39 W |
| Maryland Veterans Cemetery | Cemetery | 11 | Dorchester | 38 40 32 N | 075 53 53 W |
| Maryland Wholesale Food Center | Locale | 63 | Howard | 39 09 39 N | 076 47 04 W |
| Maryland Workshop for the Blind | Building | 12 | Wicomico | 38 24 17 N | 075 34 44 W |
| Maryland Yacht Club | Locale | 1 | Baltimore (city) | 39 15 17 N | 076 36 56 W |
| Marymount | Populated Place | 118 | Montgomery | 39 01 19 N | 077 07 39 W |
| Marys Choice | Populated Place | 13 | Baltimore | 39 20 07 N | 076 26 37 W |
| Maryvale | Populated Place | 61 | Prince George's | 38 47 51 N | 076 48 29 W |
| Maryvale Elementary School | School | 127 | Montgomery | 39 05 28 N | 077 08 13 W |
| Maryvale Park | Park | 96 | Frederick | 39 24 44 N | 077 25 42 W |
| Maryvale Park | Park | 116 | Montgomery | 39 05 18 N | 077 08 14 W |
| Maryvale Prep School | School | 147 | Baltimore | 39 25 44 N | 076 41 10 W |
| Maryville Convent | Church | 153 | Baltimore | 39 15 32 N | 076 44 14 W |