M
- Meductic
- (Saint John County) Middle Island
- (Charlotte County) McGraws Island
- (Kings County) Mather Island
- (Charlotte County) Marble Island
- (Charlotte County) Man of War Island
- (Saint John County) Manawagonish Island
- (Charlotte County) Macs Island
- (York County) Middle Hainesville
- (York County) Maple Ridge
- (Carleton County) Monquart
- (Carleton County) Mapledale
- (Carleton County) McKenzie Corner
- (Carleton County) Mainstream
- (Carleton County) McMonagle Corner
- (Carleton County) McGrath Corner
- (Carleton County) MacIntosh Mill
- (Carleton County) Murphy Corner
- (Carleton County) Moose Mountain
- (Northumberland County) McKendrick Lake
- (Carleton County) Mineral
- (Carleton County) Maplehurst
- (Restigouche) Mann Mountain Settlement
- (Gloucester County) Middle River
- Minto
- Memramcook
- McAdam
- (Madawaska County) Moulin-Morneault
- (Northumberland County) McNamee
- (Northumberland County) McGraw Brook