- Marks Place
- Marne
- Mars
- Marsh Creek Springs
- Marsh Mill
- Marshall
- Marshall Junction
- Martell
- Martinez
- Martinez
- Martinez Place
- Martins
- Martins Beach
- Martinus Corner
- Mary Ellen Place
- Mascorini Place
- Massack
- Matchin
- Matheny
- Mather
- Mather AFB
- Mather Field
- Matheson
- Mathews Mill
- Matilija
- Matilija Springs
- Mattei
- Maxson
- Maxwell
- Mayaro