| | | Manistee County | MI | 26101 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=ManisteeCounty+MI |
| | | Marquette County | MI | 26103 | | Marquette, MI 32100 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=MarquetteCounty+MI |
| | | Mason County | MI | 26105 | | Ludington, MI 31220 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=MasonCounty+MI |
| | | Mecosta County | MI | 26107 | | Big Rapids, MI 13660 | Grand Rapids-Wyoming, MI 266 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=MecostaCounty+MI |
| | | Menominee County | MI | 26109 | | Marinette, WI-MI 31940 | Marinette-Iron Mountain,
WI-MI 361 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MenomineeCounty+MI |
| | | Midland County | MI | 26111 | | Midland, MI 33220 | Saginaw-Midland-Bay City,
MI 474 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=MidlandCounty+MI |
| | | Missaukee County | MI | 26113 | | Cadillac, MI 15620 | | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MissaukeeCounty+MI |
| | | Monroe County | MI | 26115 | | Monroe, MI 33780 | Detroit-Warren-Ann Arbor,
MI 220 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=MonroeCounty+MI |
| | | Montcalm County | MI | 26117 | | Grand
Rapids-Wyoming-Kentwood,
MI 24340 | Grand Rapids-Wyoming, MI 266 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MontcalmCounty+MI |
| | | Montmorency County | MI | 26119 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=MontmorencyCounty+MI |
