Area code 231 is a North American telephone area code - being used in U.S. state of Michigan. It came into being as a result of area code 616 split in June 1999. Area code 616 got split and its northern half was assigned with a new area code - code 231. Before splitting, code 616 was assigned to entire western half of the state of Michigan.
It was created in June 1999 as a split from area code 616. The Code 231 is essentially the northern half of the old 616 area code. Code 616 previously covered the entire western half of the state of Michigan, extending west from the north-south line aligned with the Mackinac Bridge.
Areas split or overlay divides the region further into smaller parts. Each new area is assigned with different codes - so that telephone services can be provided more efficiently and resourcefully. Codes are used to identify different regions - phone number can repeat but the code will always be unique.
Standard Time Zone for the code 231 is Eastern Time Zone. There are total four hundred and sixty five Exchanges are working in a 231 area code.
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