The U.S. state of Michigan is divided into eleven numbering plan areas (NPAs) in the North American Numbering Plan (NANP), which are served by a total of twelve area codes. Only one NPA is an overlay complex.
| Area code | Year created | Parent NPA | Overlay | Numbering plan area |
|---|---|---|---|---|
| 313 | 1947 | – | – | Wayne County: Detroit, Dearborn, Redford Township, and the Grosse Pointes |
| 734 | 1997 | 313 | – | Western and Down River/ Southeastern Michigan Metro Detroit: Ann Arbor, Monroe, Wayne, and Ypsilanti |
| 810 | 1993 | 313 | – | Southern Flint/Tri-Cities and The Thumb: Port Huron, Flint, Flushing, Otisville, Davison, Brighton, Sandusky, and Lapeer |
| 248 | 1997 | 810 | 248/947 | Northern Metro Detroit: All of Oakland County, Northville, and most of Northville Township |
| 947 | 2002 | 248 | ||
| 586 | 2001 | 810 | – | Northeastern Metro Detroit: All of Macomb County |
| 517 | 1947 | – | – | South Central Michigan: Lansing, East Lansing, Jackson, Charlotte, Coldwater, Howell, Hillsdale, and Adrian |
| 989 | 2001 | 517 | – | Northern, Flint/Tri-Cities and Northeastern Lower Michigan: Alpena, Oscoda, Tawas City, Mt. Pleasant, Bay City, Saginaw, Midland, Owosso, Gaylord, Bad Axe, Sebewaing, and Unionville |
| 616 | 1947 | – | – | Western Michigan: Grand Rapids, Holland, Greenville, Grand Haven, Zeeland, and Ionia |
| 906 | 1961 | 616 | – | Upper Peninsula: Marquette, Sault Ste. Marie, St. Ignace, Escanaba, Iron Mountain, Munising, and Mackinac Island |
| 231 | 1999 | 616 | – | Northwestern Lower Michigan: Traverse City, Ludington, Muskegon, Petoskey, Big Rapids and Cheboygan |
| 269 | 2002 | 616 | – | Southwestern Michigan: Battle Creek, Benton Harbor, Allegan, Hastings, Kalamazoo, and St Joseph |
An additional area code, 679, to be overlaid with 313 is in network planning stage with a projected in-service date of November 7, 2025. [1]