| | | Houghton County | MI | 26061 | | Houghton, MI 26340 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=HoughtonCounty+MI |
| | | Huron County | MI | 26063 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=HuronCounty+MI |
| | | Ingham County | MI | 26065 | | Lansing-East Lansing, MI 29620 | Lansing-East
Lansing-Owosso, MI 330 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=InghamCounty+MI |
| | | Ionia County | MI | 26067 | | Grand
Rapids-Wyoming-Kentwood,
MI 24340 | Grand Rapids-Wyoming, MI 266 | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=IoniaCounty+Michigan |
| | | Iosco County | MI | 26069 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=IoscoCounty+MI |
| | | Iron County | MI | 26071 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=IronCounty+MI |
| | | Isabella County | MI | 26073 | | Mount Pleasant, MI 34380 | Mount Pleasant-Alma, MI 394 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=IsabellaCounty+MI |
| | | Jackson County | MI | 26075 | | Jackson, MI 27100 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=JacksonCounty+MI |
| | | Kalamazoo County | MI | 26077 | | Kalamazoo-Portage, MI 28020 | Kalamazoo-Battle
Creek-Portage, MI 310 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=KalamazooCounty+MI |
| | | Kalkaska County | MI | 26079 | | Traverse City, MI 45900 | | Outlying | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=KalkaskaCounty+MI |
