Find any 517- phone number in Michigan
The 517 area code is an area code in the North American Numbering Plan (NANP) that designates the state of Michigan. This code is one of the original area codes developed for the NANP, and it was initially deployed in 1947. It covers the southeastern and south-central parts of the Michigan lower peninsula, from the Toledo and northern Ohio border to the Bay City, Saginaw, and Port Huron area. The 517 area code is bordered by the 586, 248, 734, 519, and 989 area codes.
The North American Numbering Plan dictates how telephone numbers are assigned and formatted in the United States and Canada. It consists of dividing the area of each country into geographic regions and assigning a three-digit area code to each region. The plan also tunes the numbering system to make sure it is compatible with the existing infrastructure and telephone numbering systems. The 517 area code has remained in place since its initial deployment, although the number of telephone numbers assigned and governed by the 517 area code has increased greatly over time.