- Manor Park
- Manordale
- Manotick Station
- Mansfield
- Marathon
- Marchhurst
- Marshall Bay
- Martins Corners
- McKay's Waterfront
- McKellar Heights
- Mechanicsville
- Merivale
- Merivale Gardens
- Metcalfe
- Mills Corners
- Mohr Corners
- Mooneys Bay
- Moores Corners
- Munster
- Maple Lake Park
- Maplewood
- Medina
- Milldale
- Mount Elgin
- Muir
- Maecks Subdivision
- Magnetawan
- Maple Island
- McMurrich
- Midlothian