- Markham
- Marmion
- Marmora
- Marnoch
- Marsh Hill
- Marshall Bay
- Marsville
- Marthaville
- Martin Farm
- Martins Corner
- Martins Corners
- Martins Landing
- Martinville
- Martyrs Shrine
- Marvelville
- Maryhill
- Marysville
- Marysville
- Massanoga
- Massey
- Matachewan
- Mathers Corners
- Matheson
- Mattawa
- Mattice
- Maxwell
- Mayfair
- Mayhews Landing
- Maynard
- Mayne Corners