- Miller Memorial Community
- Millington
- Millstone
- Millville
- Milton
- Mine Island
- Mink Island
- Minnie Island
- Minortown
- Miramichi
- Miry Brook
- Mitcheltown
- Mixville
- Mobile Medical Unit
- Mohegan
- Momauguin
- Money Island
- Monroe
- Montowese
- Montville Center
- Moodus
- Moon Rock
- Mooreville
- Moosup
- Morgan Fair Corners
- Morningside
- Morningside Park
- Morris
- Morris Cove
- Mount Carmel