- Murdock
- Markle
- Markleville
- Meadowbrook
- Moonville
- Mauckport
- McCordsville
- Medaryville
- Mellott
- Melody Hill
- Meridian Hills
- Merom
- Merrillville
- Michiana Shores
- Michigan City
- Michigantown
- Millhousen
- Mishawaka
- Maple Ridge
- Mapleton
- Maplewood Mobile Home Park
- Mayflower Meadows
- Maywood
- Mickleyville
- Millersville
- Mount Jackson
- Maxinkuckee
- Mount Olive
- Mount Pleasant
- Moores Hill