- Mabie
- Macdoel
- Mad River
- Madera
- Madera Acres
- Madison
- Magalia
- Malaga
- Malibu
- Mammoth Lakes
- Mammoth Mountain Ski Area
- Manchester
- Manhattan Beach
- Manila
- Manteca
- Manton
- March Air Force Base
- Maricopa
- Marin City
- Marina
- Marina Del Rey
- Mariposa
- Markleeville
- Martell
- Martinez
- Marysville
- Matheny
- Maxwell
- Mayflower Village
- Maywood
- McArthur
- McClellan Park
- McClenney Tract
- McCloud
- McFarland
- McKinleyville
- McKittrick
- Mead Valley
- Meadow Valley
- Meadow Vista
- Meadowbrook
- Mecca
- Meiners Oaks
- Mendocino
- Mendota
- Menifee
- Menlo Park
- Mentone
- Merced
- Meridian
- Mesa
- Mesa Verde
- Mesa Vista
- Mettler
- Mexican Colony
- Mi-Wuk Village
- Middletown
- Midpines
- Midway City
- Milford
- Mill Valley
- Millbrae
- Millville
- Milpitas
- Mineral
- Minkler
- Mira Mesa
- Mira Monte
- Miranda
- Mission Canyon
- Mission District
- Mission Hills
- Mission Viejo
- Modesto
- Mohawk Vista
- Mojave
- Mokelumne Hill
- Monmouth
- Mono City
- Mono Vista
- Monrovia
- Monson
- Montague
- Montalvin
- Montara
- Montclair
- Monte Rio
- Monte Sereno
- Montebello
- Montecito
- Monterey
- Monterey Park
- Montgomery Creek
- Monument Hills
- Moorpark
- Morada
- Moraga
- Moreno Valley
- Morgan Hill
- Morongo Valley
- Morro Bay
- Mortmar
- Moskowite Corner
- Moss Beach
- Moss Landing
- Mount Hebron
- Mount Hermon
- Mount Shasta
- Mount Shasta Board & Ski Park
- Mountain Center
- Mountain Gate
- Mountain High
- Mountain House
- Mountain Mesa
- Mountain Ranch
- Mountain View
- Mountain View
- Mountain View Acres
- Mt Laguna
- Mt. Baldy
- Muir Beach
- Murphys
- Murrieta
- Murrieta Hot Springs
- Muscoy
- Myers Flat
- Myrtletown
