| | | Presque Isle County | MI | 26141 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=PresqueIsleCounty+MI |
| | | Roscommon County | MI | 26143 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=RoscommonCounty+MI |
| | | Saginaw County | MI | 26145 | | Saginaw, MI 40980 | Saginaw-Midland-Bay City,
MI 474 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=SaginawCounty+MI |
| | | Sanilac County | MI | 26151 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=SanilacCounty+MI |
| | | Schoolcraft County | MI | 26153 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=SchoolcraftCounty+MI |
| | | Shiawassee County | MI | 26155 | | Owosso, MI 37020 | Lansing-East
Lansing-Owosso, MI 330 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ShiawasseeCounty+MI |
| | | St. Clair County | MI | 26147 | Warren-Troy-Farmington
Hills, MI 47664 | Detroit-Warren-Dearborn,
MI 19820 | Detroit-Warren-Ann Arbor,
MI 220 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=St.ClairCounty+MI |
| | | St. Joseph County | MI | 26149 | | Sturgis, MI 44780 | Kalamazoo-Battle
Creek-Portage, MI 310 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=St.JosephCounty+MI |
| | | Tuscola County | MI | 26157 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=TuscolaCounty+MI |
| | | Van Buren County | MI | 26159 | | | | | metro county (urban) | nonspecialized | https://maps.google.com/?q=VanBurenCounty+MI |
