Area code 313 - Wikipedia
https://en.wikipedia.org/wiki/Area_code_313
Area code 313 was assigned as one of the original 86 area codes in October 1947. It originally served the southeastern quadrant of Michigan, including Metro Detroit, Flint, and the southern part of The Thumb. The rest of the eastern half of the Lower Peninsula was assigned to area code 517. Because of the demand for new telephone service in Detroit's suburbs and neighboring areas, the northern portion, including Detroit's northern suburbs, Flint and the southern Thumb were split o…
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