- M and R Colonia
- M-S Colonia
- Madero
- Magnolia Number 1 Colonia
- Maier Colonia
- Marla Colonia
- Mary K Acres Colonia
- Mata Colonia
- Mata Colonia Number 2
- Matt Colonia
- Max Colonia
- McColl Estates Colonia
- McCook
- McDaniel Addition Colonia
- McDaniel Colonia
- Meadow Creek Country Club Colonia
- Meadow Lands Colonia
- Merito
- Merrill Colonia
- Mesquite Acres Colonia
- Mid-Valley Estates Colonia
- Midway Village Colonia
- Milagro Estates Colonia
- Mile 10 North at Mile 5 West Colonia
- Miller Resub Lot A Colonia
- Milyca Colonia
- Minnesota Road-I Road Colonia
- Minnie Fenton Colonia
- Mission West Estates Colonia
- Monica Acres Colonia