- Middlebury (village)
- Monkton Boro
- Monkton Ridge
- Mud Island
- MacIntyre
- Manchester Depot
- Mackville
- Morses Mills
- Mosquitoville
- Malletts Bay
- Marble Island
- Mason Island
- Meach Island
- Mechanicsville
- Miltonboro
- Maidstone
- Miles Pond
- Mill Village
- Moccasin Mill
- Morses Mill
- Maquam
- Melville Landing
- Metcalfe Island
- Morses Line
- Mudgett Island
- Mill Village
- Merrill Corner
- Mill Village
- Morgan Center
- Marolin Acres