- Macada
- Macungie
- Madison (Dane, Wisconsin)
- Madison County (Alabama)
- Maitland
- Malba
- Malibu
- Malverne
- Mammoth Lakes
- Manalapan
- Manassas (Manassas, Virginia)
- Manchester
- Manhasset
- Manhattan (Will, Illinois)
- Manhattan Beach (Brooklyn, New York)
- Manhattan Beach (Los Angeles, California)
- Manhattan Valley
- Manhattanville
- Manorville
- Mar Vista
- Marathon
- Marble Hill
- Marengo
- Margate
- Maricopa County
- Marina Del Rey
- Marine Park
- Marion County (Florida)
- Marion County (Indiana)
- Marlborough
- Marquette Park
- Martin County
- Martins Creek
- Martinsville (Martinsville, Virginia)
- Mashantucket
- Maspeth
- Massapequa
- Massapequa Park
- Mastic
- Mastic Beach
- Mathews (Mathews, Virginia)
- Mathews County
- Matinecock
- Mattituck
- Maxatawny Township
- Maywood (Cook, Illinois)
- Maywood (Los Angeles, California)
- McHenry
- McHenry County
- McKinley Park
- Meatpacking District
- Mecklenburg County (North Carolina)
- Mecklenburg County (Virginia)
- Medford
- Melbourne
- Melfa
- Melrose
- Melrose Park
- Melville
- Memphis
- Merced
- Meriden
- Merrick
- Merrionette Park
- Mertztown
- Mesa
- Mettawa
- Miami Beach
- Miami Lakes
- Miami Shores
- Miami Springs
- Michigan City
- Middle Island
- Middle Village
- Middlebury
- Middlefield
- Middlesex County (Connecticut)
- Middlesex County (Virginia)
- Middletown
- Midland Beach
- Midlothian
- Midtown
- Midway
- Midwood
- Milford (Easton, Pennsylvania)
- Milford (New Haven, Connecticut)
- Mill Basin
- Mill Neck
- Miller Place
- Milwaukee
- Mineola
- Minneapolis
- Miramar
- Mission Hills
- Mission Viejo
- Mobile
- Modesto
- Mokena
- Monroe (Fairfield, Connecticut)
- Monroe County (Florida)
- Monroe County (Pennsylvania)
- Monrovia
- Montauk
- Montclare
- Montebello
- Montecito Heights
- Monterey County
- Monterey Park
- Montgomery (Kane, Illinois)
- Montgomery (Montgomery, Alabama)
- Montgomery County (Alabama)
- Montpelier
- Montrose
- Montville
- Moorestown
- Morgan Park
- Moriches
- Morningside Heights
- Morris Heights
- Morris Park
- Morrisania
- Morton Grove
- Mott Haven
- Mount Airy
- Mount Bethel
- Mount Dora
- Mount Eden
- Mount Greenwood
- Mount Hope
- Mount Prospect
- Mount Royal
- Mount Sinai
- Mount Vernon
- Mount Washington
- Moyock
- Mundelein
- Munster
- Murfreesboro
- Murray Hill (Manhattan, New York)
- Murray Hill (Queens, New York)
- Muttontown
- Mystic