- Matagorda Island
- McGilvery Island
- Medio Island
- Monica
- Monte Grande
- Macedonia
- Matinburg
- Masterson
- Midway
- Midway
- McCoy
- Mulkey
- Margaret
- McHattie
- Mission Bend South
- Mission Glen
- Mission Green North
- Mission West
- Missouri City Estates
- Mooredale
- Mustang Island
- Macon
- Majors
- Marshy Springs
- Melon
- Mewshaw
- Miguel
- Mittie
- Mixon
- Morrill