- Machias
- Machiasport
- Macwahoc
- Madawaska
- Madawaska
- Madison
- Madrid
- Manchester
- Mapleton
- Mariaville
- Mars Hill
- Marshfield
- Masardis
- Mattawamkeag
- Mechanic Falls
- Meddybemps
- Medford
- Medway
- Mercer
- Mexico
- Milbridge
- Milford
- Millinocket
- Milo
- Milton
- Minot
- Monhegan
- Monmouth
- Monroe
- Monson
- Monticello
- Moose River
- Morrill
- Moscow
- Mount Vernon
- Mt. Abram Ski Resort
- Mt. Jefferson
