| MR PDC Independent Cities, VA (County) |
| Mt Juliet City, TN (City) |
| Mt. Pleasant, IN (Township) |
| Mud Lake, ID (City) |
| Muddy, IL (Village) |
| Muddy Creek Township, PA (Township) |
| Mudgett, MN (Township) |
| Mueller Township, MI (Township) |
| Muenster, TX (City) |
| Muhlenberg County, KY (County) |
| Muhlenberg Township, PA (Township) |
| Muhlenberg Township, OH (Township) |
| Muir, MI (Village) |
| Mukilteo, WA (City) |
| Mukwa Town, WI (Town) |
