Area code 989 is a telephone area code in the North American Numbering Plan 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),[1] as well as the highest possible under the current system, in which a middle digit of 9 is forbidden.
- ^ "Geographic NPAs In Service Sorted by Number". North American Numbering Plan Administrator. Archived from the original on 2019-05-25. Retrieved 2019-05-25.