- Mount Parnassus
- Madison Center
- Marine Island
- Mary Rock
- Meadowbrook
- Middle Beach
- Middle Rock
- Middle Rock
- Milford Lawns
- Mill Plain
- Millbrook
- Miller Memorial Community
- Millville
- Mine Island
- Mixville
- Momauguin
- Money Island
- Montowese
- Moon Rock
- Morningside
- Morris Cove
- Mount Carmel
- Mount Carmel Center
- Mountaincrest
- Myrtle Beach
- Mechanicsville
- Major Island
- Manitock Spring
- Marvin Island
- Mashantucket