- Mabank
- Maben
- Mableton
- Macatawa
- Macedon
- Macedonia
- Maceo
- Machesney Park
- Mack
- Mackey
- Mackeyville
- Mackinaw
- Macomb
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- Macy
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- Madera
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- Madison
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- Magee
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- Mahomet
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- Mahwah
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- Malone
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- Malvern
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- Mamaroneck
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- Mammoth Spring
- Manakin-Sabot
- Manalapan Township
- Manasquan
- Manassas
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- Mancelona
- Manchaca
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- Manchester Township
- Mancos
- Mandeville
- Mango
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- Manor
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- Manton
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- Maple Lake
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- Mapleton
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- Markle
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- Mathis
- Matlacha
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- Maxwell
- May
- Mayesville
- Mayfield
- Mayfield Heights
- Mayhill
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- Mayodan
- Mays
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- Mayville
- Maywood
- Mazomanie
- McAlester
- McAllen
- McAlpin
- McBain
- McCall
- McCalla
- McCarr
- McClellan Park
- McClure
- McComb
- McCook
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- McDaniels
- McDonough
- McEwen
- McFarland
- McGraw
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- McKees Rocks
- McKeesport
- McKenzie
- McKinleyville
- McKinney
- McLean
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- McMillan
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- McPherson
- McRae
- Mead
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- Meadowbrook
- Meadowlands
- Meadville
- Mears
- Mebane
- Mecca
- Mechanicsburg
- Mechanicsville
- Mechanicville
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- Medfield
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- Media
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- Medina
- Medinah
- Medley
- Medora
- Medway
- Melba
- Melber
- Melbourne
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- Mellott
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- Melville
- Melvindale
- Memphis
- Mena
- Menan
- Menands
- Menasha
- Mendham
- Mendocino
- Mendon
- Mendota
- Mendota Heights
- Menifee
- Menlo
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- Menominee
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- Menomonie
- Mentone
- Mentor
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- Meraux
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- Mercer
- Mercer Island
- Mercersburg
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- Meredosia
- Meriden
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- Mernda
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- Milford Mill
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- Millersville
- Millington
- Millis
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- Mineola
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- Mirabel
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- Mitaka-shi
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- Mitchells
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- Mode
- Modesto
- Modoc
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- Mogadore
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- Mohnton
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- Molalla
- Moline
- Momence
- Monaca
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- Monclova
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- Monee
- Moneta
- Monett
- Mongo
- Monkton
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- Monmouth Beach
- Mono
- Monon
- Monona
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- Monroe
- Monroe City
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- Monroeville
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- Montague
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- Montebello
- Montecito
- Monterey
- Monterey Park
- Montevideo
- Monteview
- Montezuma
- Montgomery
- Montgomery Village
- Montgomeryville
- Monticello
- Montmorenci
- Montoursville
- Montpelier
- Montréal
- Montrose
- Montvale
- Montville
- Monument
- Moon
- Moonachie
- Moore
- Moore Haven
- Mooreland
- Moores Hill
- Mooresboro
- Mooresburg
- Moorestown
- Mooresville
- Mooretown
- Moorhead
- Moorpark
- Mooseheart
- Moosic
- Moraga
- Moraine
- Morehead
- Morehead City
- Moreland
- Moreland Hills
- Morenci
- Moreno Valley
- Morgan
- Morgan City
- Morgan Hill
- Morganfield
- Morganton
- Morgantown
- Morning Sun
- Morning View
- Morocco
- Moroni
- Morral
- Morrice
- Morrill
- Morrilton
- Morris
- Morris Plains
- Morrison
- Morriston
- Morristown
- Morrisville
- Morrow
- Morton
- Morton Grove
- Moscow
- Moscow Mills
- Moseley
- Moses Lake
- Mosinee
- Moss Beach
- Mossville
- Moulton
- Moultrie
- Mound
- Moundridge
- Mounds View
- Mount Airy
- Mount Arlington
- Mount Aukum
- Mount Ayr
- Mount Calvary
- Mount Carmel
- Mount Carroll
- Mount Clemens
- Mount Dora
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- Mount Erie
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- Mount Healthy
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- Mount Horeb
- Mount Ida
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- Mount Joy
- Mount Juliet
- Mount Kisco
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- Mount Lebanon
- Mount Morris
- Mount Mourne
- Mount Olive
- Mount Olive Township
- Mount Orab
- Mount Pleasant
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- Mount Saint Francis
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- Mountain Brook
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- Mountain Lake
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- Mountain Top
- Mountain View
- Mountain Village
- Mountainburg
- Mountainside
- Mountlake Terrace
- Mountville
- Mowrystown
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- Muenster
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- Mukwonago
- Mulberry
- Mulberry Grove
- Muldraugh
- Muldrow
- Muleshoe
- Mülheim an der Ruhr
- Mullins
- Mulvane
- Muncie
- Muncy
- Mundelein
- Munford
- Munfordville
- Munhall
- Munroe Falls
- Munster
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- Murphy
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- Murray
- Murrells Inlet
- Murrieta
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- Muscatine
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- Muskego
- Muskegon
- Muskegon Heights
- Muskogee
- Mustang
- Mutual Consent
- Myerstown
- Myersville
- Myrtle Beach