| Marcy Township, IA (Township) |
| Mardela Springs, MD (Town) |
| Marena, KS (Township) |
| Marengo, IN (Town) |
| Marengo, IL (City) |
| Marengo, IA (City) |
| Marengo, OH (Village) |
| Marengo County, AL (County) |
| Marengo Town, WI (Town) |
| Marengo Township, MI (Township) |
| Marengo Township, IA (Township) |
| Marengo Township, IL (Township) |
| Marenisco Township, MI (Township) |
| Marfa, TX (City) |
| Margaret, ND (Township) |
