- Machias
- Madrid
- Madison
- Manchester
- Marshfield
- Medford
- Milford
- Milton
- Monroe
- Monticello
- Moscow
- Mount Vernon
- Medway
- Mercer
- Mexico
- Minot
- Monmouth
- Monson
- Machiasport
- Macwahoc
- Madawaska
- Mark Island
- Mouse Island
- Moose Island
- Middle Hardwood Island
- Machias Seal Island
- Mackamp
- Mackerel Rock
- Mackworth Island
- MacMahan