| M 17 A | 35 | 382.539 | Lt Eversden |
| M 17 B | 35 | 382.526 | Harlton |
| M 17 C | 35 | 385.515 | Barrington |
| M 21 A | 55 | 503.535 | Babraham |
| M 21 B | 55 | 501.528 | Babraham |
| M 21 A sic | 55 | 509.531 | Babraham |
| Madingley | 36, 35, 45, 46 | | |
| Madingley Brick Pit | 46 | 404.615 | Madingley |
| Madingley Church | 36 | 394.603 | Madingley |
| Madingley Hall/Park | 36 | | Madingley |
| Madingley Mill | 45 | 407.594 | Madingley |
| Madingley Mill Plantation | 45 | 40-.59- | Madingley |
| Madingley Old chalk pit | 45 | 402.598 | Madingley |
| Madingley Road | 45 | | Cambridge |
| Madingley Wood | 35, 45 | | Madingley |
| Magazine Lane | 40 | c.453.091 | Wisbech |
| Maggot's Hill/Mound | 45 | 442.507 | Harston |
| Mag's Hill | 55 | 50-54- | Fulbourn |
| Malice Farm | 30 | 323.085 | Thorney |
| Malton Farm/Moat | 34 | 37-48- | Orwell, (on R.Cam) |
| Manea | 48, 49, 59 | | |
| Manea Toll | ? | | |
| Manea Station | 49 | 479.910 | Manea |
| Manor House/Park | 38 | 39-85- | Chatteris |
| March | 49, 39, 30, 40 | | |
| Mare Way | 45 | | 'just N of Barton Rd' |
| Mare Way | 35 | | Gt & Lt Eversden/Wimpole |
| Mare / Mere Way | 46 | | Chesterton, Impington, Landbeach |
| | | | Milton, and Waterbeach |
| Mare Way | 47 | 43-71- | Willingham ? = The Causeway |
| Marmer's Wood | 65 | 645.573 | Dullingham |
| Marsh Field | 40, 41 | 46-09- to 46-10- | Wisbech |
| Maynard's Field | 44 | 448.488 | Whittlesford |
| Meadlands Drove | ?37 | | Wimblington |
| | | | ? = see Meadlands North Drove |
| Meadlands Farm | 37 | 398.781 | Sutton |
| Meadlands North Drove | 37 | 39-78- | Sutton |
| Meadowgate Lane | 40 | c.47-08- | Emneth |
| Meggot's Mound | 45 | | see Maggot's Mount |
| Meggs Hill | 55 | 50-52 | Babraham |
| Melbourn | 34, 44 | | |
| Melbourn Bury Meadow | 34 | 377.440 | Melbourn |
| Melbourn Common | 34 | 39-45- | Melbourn |
| Melbourn Moor | 34 | 38-45- | Melbourn |
| Meldreth | 34 | | |
| Mepal | 48, 47 | | |
| Mepal Bridge | 48 | 43-81- | Mepal |
| Mepal Common (1) | 48 | | see Mepal Fen |
| Mepal Fen | 48 | 436.815 | Mepal |
| Middle Drove | 41 | c.46-10- | Crabmarsh, Wisbech |
| Middle Fen | 57 | 57-79- | Ely |
| Middle Hill | 56 | | Swaffham Bulbeck/Prior |
| Middle Hill Drove | 57 | ?53-70- | ? Waterbeach |
| Mildenhall Drain | 58, 68 | | Littleport |
| Mildenhall Road | 58. 68 | | Littleport |
| The Mile Drove | ?37 | | Chatteris |
| 3 Milestone, Sutton Rd (1) | 41 | 447.137 | Newton |
| 4 Milestone, Sutton Rd (1) | 41 | 449.153 | Newton (see above) |
| 4 Milestone, [Out]well Rd | 40 | 498.054 | Elm |
| Mill End | 38 | 39-85- | Chatteris |
| Mill Field | 38 | ?39-85- | ?Chatteris |
| Mill Green | 64 | 62-45- | Shudy Camps |
| Mill, First on Lynne Rd (W) | 41 | 463.100 | Wisbech |
| Mill, 2nd on Lynne Rd | 41 | 4660.1015 | Wisbech (see above) |
| Mill Lane | 46 | 454.604 | = Hurst Park Ave, Chesterton |
| Milton | 46 | | |
| Milton Army Camp | 46 | 46-61- | now Science Park, Cambridge |
| Milton Hall Park | 46 | | Milton |
| Milton Hall Plantations | 46 | | Milton |
| Milton Pits, Gravel Pit | 46 | 48-62- | now Milton Country Park |
| Milton Railway Sidings | 46 | | see Chesterton Sidings in Milton |
| Milton Sewage Farm | 46 | 475.615 | see Cambridge Sewage Farm |
| Mitchell Hill Common | 47 | 47-70-, 48-70- | Cottenham |
| Monument Hill | 45 | | Harston see - Maggot's Mount |
| Moor Barns | 45 | 414.597 | Madingley |
| Moor Barns Meadow | 45 | 411.594 | Coton |
| Moor Barns Thicket | 45 | 411.596 | Madingley |
| Morden Grange/ Heath Plantation | 24, 23, 33, 34 | | Steeple Morden |
| Morden Grange/Heath Farm | 34 | 307.405 | Steeple Morden |
| Morden House | 24 | 281.437 | Steeple Morden |
| Mount Pleasant | 45 | 445.592 | = Castle End, Cambridge |
| Mount Pleasant | 41 | c.464.105 | Wisbech |
| Muckdungle Corner | 55 | 556.599 | Bottisham |
| Muslick Fen (Muslack) | 48 | 40-84- | Chatteris |
| Mutlow Hill, Fleam Dyke | 55 | 54-54- | Fulbourn/Gt Wilbraham |