- Mary Ellen Place
- Marysville
- Mascorini Place
- Massack
- Matchin
- Matheny
- Mather
- Mather AFB
- Mather Field
- Matheson
- Mathews Mill
- Matilija
- Matilija Springs
- Mattei
- Maxson
- Maxwell
- Mayaro
- Mayfair
- Mayflower Village
- Mayhew
- Maywood
- McArthur
- McArthur
- McArthur Mobile Home Park
- McAvoy
- McCann
- McCartney Place
- McClellan Park
- McClellan Place
- McClenney Tract