- Mabank
- Macdona
- Madisonville
- Magnolia
- Malakoff
- Malone
- Manchaca
- Manor
- Mansfield
- Manuel Garcia II
- Manvel
- Marathon
- Marble Falls
- Marfa
- Marietta
- Marion
- Markham
- Marlin
- Marquez
- Marshall
- Marshall Creek
- Mart
- Martindale
- Mason
- Matador
- Matagorda
- Mathis
- Maud
- Mauriceville
- Maypearl
- McAllen
- McCamey
- McDade
- McGregor
- McKinney
- McKinney Acres
- McLean
- McLendon-Chisholm
- McQueeney
- Meadow
- Meadowlakes
- Meadows Place
- Medina
- Medina
- Megargel
- Melissa
- Melvin
- Memphis
- Menard
- Mentone
- Mercedes
- Meridian
- Merkel
- Mertens
- Mertzon
- Mesquite
- Mexia
- Mi Ranchito Estate
- Miami
- Midland
- Midlothian
- Midway
- Midway North
- Midway South
- Mila Doce
- Milam
- Milano
- Mildred
- Miles
- Milford
- Millers Cove
- Millican
- Millsap
- Mineola
- Mineral Wells
- Mingus
- Mirando City
- Mission
- Mission Bend
- Missouri City
- Mobeetie
- Mobile City
- Monahans
- Mont Belvieu
- Montague
- Monte Alto
- Montgomery
- Moody
- Moore
- Moore Station
- Moraida
- Morales-Sanchez
- Moran
- Morgan
- Morgan Farm Area
- Morgan Farm Colonia
- Morgans Point
- Morgans Point Resort
- Morning Glory
- Morse
- Morton
- Moulton
- Mount Calm
- Mount Enterprise
- Mount Pleasant
- Mount Vernon
- Mountain City
- Muenster
- Muleshoe
- Mullin
- Munday
- Muniz
- Murchison
- Murillo Colonia
- Murphy
- Mustang
- Mustang Ridge
- Myrtle Springs
