Six Individual 1990 ZIP Code Boundary Maps

Upper Peninsula - Includes the following counties: Alger, Baraga, Chippewa, Delta, Dickinson, Gogebic, Houghton, Iron, Keweenaw, Luce, Mackinac, Marquette, Menominee, Ontonagon, Schoolcraft

Northern Lower Peninsula - Includes the following counties: Antrim, Alcona, Alpena, Arenac, Benzie, Charlevoix, Cheboygan, Clare, Crawford, Emmet, Gladwin, Grand Traverse, Iosco, Kalkaska, Lake, Leelanau, Manistee, Mason, Missaukee, Montmorency, Ogemaw, Osceola, Oscoda, Presque Isle, Roscommon, Wexford

Western Mid-Michigan - Includes the following counties: Clinton, Gratiot, Ionia, Isabella, Kent, Mecosta, Montcalm, Muskegon, Newaygo, Oceana, Ottawa

Southwest Michigan - Includes the following counties: Allegan, Barry, Berrien, Branch, Calhoun, Cass, Eaton, Hillsdale, Ingham, Kalamazoo, Lenawee, St. Joseph, Van Buren

Eastern Mid-Michigan - Includes the following counties: Bay, Genesee, Huron, Lapeer, Midland, Saginaw, Sanilac, Shiawassee, Tuscola

Southeast Michigan - (SEMCOG Area) - Includes the following counties:  Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, Wayne

Note: Zip codes derived promarily by matching available U.S. Postal Service information to 1994 U. S. Census TIGER/Line segments. A result to the methodology may be ZIP codes shown to enter certain jurisdictions in error.  ZIP codes are subject to change.