Area Code Atlas

517 NPA Split, Creating 989 NPA (Michigan)

517 NPA Split, Creating 989 NPA (Michigan)

Revised Permissive Dialing Period for the 517 / 989 (MI) NPA Split

NPA 989 split from 517

Area code 989 was created in 2001 when it split from area code 517, dividing the eastern half of Michigan's Lower Peninsula. The new code served Central Michigan, while 517 continued to serve the south-central region.

NPA 989 split from 517

Area code 989 was created on April 7, 2001, when the central and northern portions of the old 517 territory were reassigned. This split reduced the size of 517, which had previously never been split since its creation.

NPA 989 transitions to mandatory ten-digit dialing

Area code 989 transitioned to mandatory ten-digit dialing on October 24, 2021, due to the nationwide designation of 988 as the three-digit code for the National Suicide Prevention Lifeline. This change was required to resolve conflicts with existing seven-digit dialing in the region.