Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Marconi Station Site | Building | 25 | Barnstable | 41 54 50 N | 069 58 15 W |
| Marcus Hall | Building | 75 | Hampshire | 42 23 41 N | 072 31 45 W |
| Mare Meadow Reservoir | Reservoir | 336 | Worcester | 42 29 42 N | 071 56 04 W |
| Mare Meadow Reservoir Dam | Dam | 336 | Worcester | 42 29 42 N | 071 56 04 W |
| Mare Pond | Lake | 6 | Plymouth | 41 46 22 N | 070 37 26 W |
| Mares Pond | Lake | 4 | Barnstable | 41 35 15 N | 070 35 53 W |
| Margaret C Ellis Elementary School | School | 64 | Hampden | 42 07 26 N | 072 33 20 W |
| Margaret Clapp Library | Building | 49 | Norfolk | 42 17 43 N | 071 18 22 W |
| Margaret E Robinson Playground | Park | 21 | Norfolk | 42 19 32 N | 071 07 15 W |
| Margaret E Robinson Playground | Park | 20 | Suffolk | 42 19 28 N | 071 07 18 W |
| Margaret Fuller House | Building | 5 | Middlesex | 42 21 54 N | 071 06 52 W |
| Margaret Fuller School | School | 19 | Suffolk | 42 18 32 N | 071 06 14 W |
| Margaret L Donovan School | School | 66 | Norfolk | 42 11 25 N | 071 04 13 W |
| Margarets Rock | Summit | 15 | Bristol | 41 45 25 N | 071 15 38 W |
| Margery A Rice School | School | 255 | Worcester | 42 21 07 N | 071 51 25 W |
| Marginal Brook | Stream | | Middlesex | 42 37 14 N | 071 17 43 W |
| Marguerite E Peaslee School | School | 98 | Worcester | 42 19 22 N | 071 37 41 W |
| Maria Assumpta Academy | School | 336 | Worcester | 42 29 25 N | 072 11 14 W |
| Maria Hastings School | School | 73 | Middlesex | 42 26 28 N | 071 15 13 W |
| Maria Mitchell Aquarium | Building | 5 | Nantucket | 41 16 55 N | 070 05 45 W |
| Maria Mitchell Association Natural Science Museum | Building | 15 | Nantucket | 41 16 50 N | 070 06 13 W |
| Maria Mitchell Observatory | Building | 15 | Nantucket | 41 16 50 N | 070 06 13 W |
| Maria Mitchell Science Library | Building | 15 | Nantucket | 41 16 50 N | 070 06 13 W |
| Marian Building | Building | 13 | Suffolk | 42 20 25 N | 071 06 12 W |
| Marian High School | School | 60 | Middlesex | 42 17 10 N | 071 25 19 W |
| Marian High School | School | 222 | Worcester | 42 18 25 N | 071 49 28 W |
| Marianhill High School | School | 164 | Worcester | 42 04 48 N | 072 02 12 W |
| Marilene Stedman Playground | Park | 366 | Worcester | 42 35 08 N | 071 58 55 W |
| Marine Biological Laboratory | Locale | 3 | Barnstable | 41 31 31 N | 070 40 21 W |
| Marine Industrial Park | Locale | -3 | Suffolk | 42 21 03 N | 071 02 03 W |
| Marine Park | Park | 1 | Barnstable | 41 32 55 N | 070 36 13 W |
| Mariners House | Building | 14 | Suffolk | 42 21 21 N | 071 03 11 W |
| Marion | Populated Place | 9 | Plymouth | 41 42 00 N | 070 45 46 W |
| Marion Post Office (historical) | Post Office | 6 | Plymouth | 41 42 14 N | 070 45 45 W |
| Marion Station (historical) | Locale | 7 | Plymouth | 41 43 03 N | 070 46 24 W |
| Marion Town Hall | Building | 7 | Plymouth | 41 41 08 N | 070 46 02 W |
| Marion United Methodist Church | Church | 6 | Plymouth | 41 43 39 N | 070 46 38 W |
| Marions Camp | Populated Place | 190 | Worcester | 42 09 20 N | 071 46 20 W |
| Marist College | School | 66 | Middlesex | 42 18 10 N | 071 27 35 W |
| Marist Seminary | School | 71 | Middlesex | 42 31 30 N | 071 16 20 W |
| Maritime Museum | Building | 10 | Norfolk | 42 14 28 N | 070 47 59 W |
| Market Basket Plaza Shopping Center | Locale | 93 | Worcester | 42 31 55 N | 071 44 35 W |
| Market Mills | Locale | 27 | Middlesex | 42 38 39 N | 071 18 45 W |
| Market Place Shopping Center | Locale | 43 | Norfolk | 42 09 14 N | 071 14 40 W |
| Market Square Plaza Shopping Center | Locale | 35 | Hampden | 42 08 49 N | 072 36 24 W |
| Marketplace Shopping Center | Locale | 38 | Hampden | 42 08 50 N | 072 36 21 W |
| Markham Ledge | Island | 0 | Bristol | 41 29 30 N | 071 04 55 W |
| Marks Cove | Bay | 6 | Barnstable | 41 44 12 N | 070 43 33 W |
| Marks Cove Marshes | Swamp | 0 | Plymouth | 41 44 15 N | 070 43 40 W |
| Marks Fine Arts Library | Building | 52 | Middlesex | 42 16 52 N | 071 25 07 W |
| Marks Garrison | Populated Place | 192 | Worcester | 42 14 05 N | 072 09 33 W |
| Marks Meadow Elementary School | School | 71 | Hampshire | 42 23 55 N | 072 31 35 W |
| Marks Mountain | Summit | 333 | Worcester | 42 12 28 N | 072 13 05 W |
| Marl and Clay Bed (historical) | Locale | 38 | Middlesex | 42 28 07 N | 071 16 38 W |
| Marlboro | Populated Place | 31 | Essex | 42 43 00 N | 070 58 23 W |
| Marlboro Academy | School | 415 | Berkshire | 42 07 48 N | 073 13 53 W |
| Marlboro Airport | Airport | 88 | Middlesex | 42 20 35 N | 071 30 30 W |
| Marlborough | Populated Place | 130 | Middlesex | 42 20 45 N | 071 33 08 W |
| Marlborough City Hall | Building | 115 | Middlesex | 42 20 45 N | 071 32 51 W |
| Marlborough Country Club | Locale | 106 | Middlesex | 42 21 13 N | 071 31 31 W |
| Marlborough High School | School | 135 | Middlesex | 42 21 25 N | 071 32 58 W |
| Marlborough Hospital | Hospital | 162 | Middlesex | 42 21 18 N | 071 33 16 W |
| Marlborough Hospital Heliport | Airport | 158 | Middlesex | 42 21 22 N | 071 33 16 W |
| Marlborough Industrial Park | Locale | 106 | Middlesex | 42 21 16 N | 071 35 13 W |
| Marlborough Junction | Populated Place | 93 | Middlesex | 42 19 53 N | 071 32 28 W |
| Marlborough Junior High School | School | 128 | Middlesex | 42 20 50 N | 071 33 13 W |
| Marlborough Middle School | School | 140 | Middlesex | 42 21 26 N | 071 32 55 W |
| Marlborough Post Office | Post Office | 131 | Middlesex | 42 20 46 N | 071 33 07 W |
| Marlborough Public Library | Building | 136 | Middlesex | 42 20 45 N | 071 33 17 W |
| Marlborough Sewage Disposal | Locale | 73 | Middlesex | 42 21 27 N | 071 29 26 W |
| Marsh Brook | Stream | | Berkshire | 42 20 39 N | 073 17 40 W |
| Marsh Brook | Stream | | Berkshire | 42 17 52 N | 073 18 22 W |
| Marsh Chapel | Church | 11 | Middlesex | 42 21 03 N | 071 06 24 W |
| Marsh Corner | Populated Place | 58 | Essex | 42 43 40 N | 071 13 53 W |
| Marsh Hill | Summit | 90 | Middlesex | 42 41 15 N | 071 17 43 W |
| Marsh House | Building | 107 | Hampshire | 42 22 36 N | 072 30 54 W |
| Marsh Memorial Administration Building | Building | 60 | Hampden | 42 06 04 N | 072 33 26 W |
| Marsh Pond | Swamp | 261 | Berkshire | 42 10 20 N | 073 26 58 W |
| Marshall Corner | Populated Place | 34 | Plymouth | 42 03 35 N | 071 03 58 W |
| Marshall Hall | Building | 77 | Hampshire | 42 23 32 N | 072 31 29 W |
| Marshall Middle School | School | 55 | Middlesex | 42 34 13 N | 071 16 18 W |
| Marshall Park | Park | 175 | Worcester | 42 35 53 N | 071 43 48 W |
| Marshall Park | Park | 174 | Worcester | 42 35 52 N | 071 43 45 W |
| Marshall Pond | Reservoir | 157 | Worcester | 42 17 08 N | 071 48 20 W |
| Marshall Reservoir | Reservoir | 189 | Worcester | 42 35 31 N | 071 48 20 W |
| Marshall Simonds Middle School | School | 51 | Middlesex | 42 30 04 N | 071 10 53 W |
| Marshalls Airport | Airport | 196 | Worcester | 42 21 48 N | 071 49 16 W |
| Marshalls Boston-Parker Plaza Shopping Center | Locale | 72 | Hampden | 42 08 30 N | 072 29 53 W |
| Marshfield | Populated Place | 5 | Plymouth | 42 05 30 N | 070 42 20 W |
| Marshfield Airport | Airport | 1 | Plymouth | 42 05 53 N | 070 40 17 W |
| Marshfield Center | Populated Place | 42 | Plymouth | 42 07 00 N | 070 42 58 W |
| Marshfield Centre Post Office (historical) | Post Office | 28 | Plymouth | 42 07 08 N | 070 42 29 W |
| Marshfield Centre Station (historical) | Locale | 16 | Plymouth | 42 07 13 N | 070 42 45 W |
| Marshfield Country Club | Locale | 35 | Plymouth | 42 04 48 N | 070 42 38 W |
| Marshfield Fairgrounds | Locale | 2 | Plymouth | 42 30 57 N | 070 42 56 W |
| Marshfield High School | School | 32 | Plymouth | 42 06 30 N | 070 44 16 W |
| Marshfield Hills | Populated Place | 48 | Plymouth | 42 08 45 N | 070 44 23 W |
| Marshfield Hills | Summit | 58 | Plymouth | 42 08 00 N | 070 45 28 W |
| Marshfield Hills Post Office (historical) | Post Office | 42 | Plymouth | 42 08 54 N | 070 44 25 W |
| Marshfield Neck | Cape | 4 | Plymouth | 42 06 00 N | 070 40 58 W |
| Marshfield Plaza | Locale | 5 | Plymouth | 42 05 27 N | 070 42 22 W |
| Marshfield Plaza East | Locale | 2 | Plymouth | 42 05 33 N | 070 41 55 W |
| Marshfield Plaza East Shopping Center | Locale | 8 | Plymouth | 42 05 30 N | 070 42 12 W |
| Marshfield Post Office (historical) | Post Office | 15 | Plymouth | 42 05 47 N | 070 43 04 W |
| Marshfield Station (historical) | Locale | 4 | Plymouth | 42 05 30 N | 070 42 14 W |
| Marshfield Town Hall | Building | 13 | Plymouth | 42 05 27 N | 070 42 34 W |
| Marshfield United Methodist Church | Church | 43 | Plymouth | 42 02 10 N | 070 47 22 W |
| Marston Corners | Populated Place | 55 | Essex | 42 44 30 N | 071 10 05 W |
| Marston Hall | Building | 70 | Hampshire | 42 23 42 N | 072 31 46 W |
| Marston Mills Heliport | Airport | 3 | Barnstable | 41 38 25 N | 070 24 26 W |