231 – Northwestern Lower Michigan: Traverse City, Ludington, Muskegon, Petoskey, Big Rapids and Cheboygan. Population: 652,633

248 – Northern Metro Detroit: All of Oakland County, Northville, and most of Northville Township. Overlays with area code 947 Population: 1,411,269

947 – Northern Metro Detroit: All of Oakland County, Northville, and most of Northville Township. Overlays with area code 248 Population: 1,202,362

269 – Southwestern Michigan: Battle Creek, Benton Harbor, Allegan, Hastings, Kalamazoo, and St Joseph. Population: 840,237

313 – Wayne County: Detroit, Dearborn, Redford Township, and the Grosse Pointes Population: 1,580,054

517 – South Central Michigan: Lansing, East Lansing, Jackson, Charlotte, Coldwater, Howell, Hillsdale, and Adrian Population: 875,090

586 – Northeastern Metro Detroit: All of Macomb County Population: 1,109,943

734 – Western and Down River/ Southeastern Michigan Metro Detroit: Ann Arbor, Monroe, Wayne, and Ypsilanti. Population: 1,390,129

810 – Southern Flint/Tri-Cities and The Thumb: Port Huron, Flint, Flushing, Otisville, Davison, Brighton, Sandusky, and Lapeer Population: 929,413

906 – Upper Peninsula: Marquette, Sault Ste. Marie, St. Ignace, Escanaba, Iron Mountain, Munising, and Mackinac Island Population: 317,628

989 – Northern, Flint/Tri-Cities and Northeastern Lower Michigan: Alpena, Mt. Pleasant, Bay City, Saginaw, Midland, Owosso, Gaylord, and Bad Axe Population: 1,004,214