- Martell
- Mather
- Mather AFB
- Maxwell
- Meeks Bay
- Meridian
- Mesa Grande
- Midland
- Midpines
- Midway City
- Milford
- Mill Creek
- Miracle Hot Springs
- Miramonte
- Miranda
- Moccasin
- Monmouth
- Mono Hot Springs
- Monolith
- Monta Vista
- Montalvo
- Montpelier
- Montrose
- Moreno
- Moreno, Riverside
- Mount Baldy
- Mount Eden
- Mount Hamilton
- Mount Laguna
- Mountain Center