989 is the area code for Central Michigan, the northeastern Lower Peninsula, and portions of the Thumb. It is the highest-numbered area code in use in the North American Numbering Plan (NANP), as well as the highest possible under the current system, in which a middle digit of 9 is forbidden.
Major cities and towns in the 989 region include:
- Bad Axe
- Bay City
- Houghton Lake
- Mt. Pleasant
- St. Johns
- Tawas City
- West Branch
The 989 region split off from area code 517 in 2001. Before then, 517 had served most of the eastern half of the Lower Peninsula (except the southeast) for 54 years and had been the only one of Michigan's three original area codes to have never been split.
Area code 989 has telephone numbers assigned for the central office code 988. 988 has been designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which creates a conflict for exchanges that permit seven-digit dialing. This area code is therefore scheduled to transition to ten-digit dialing, mandatory after October 24, 2021.
- "Geographic NPAs In Service Sorted by Number". North American Numbering Plan Administrator. Archived from the original on 2019-05-25. Retrieved 2019-05-25.
- "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.
|North: 906, 705/249, Lake Huron|
|West: 231, 616||area code 989||East: 519/226, 705/249, Lake Huron|
|South: 517, 810|
|Ontario area codes: 226/519/548, 249/705, 289/365/905, 343/613, 416/437/647, 807|