Area code 586 was implemented in 2001 for providing telephone services to the Macomb County of Michigan - State of United States. It was planned to add the 586 code as an overlay to area code 810 but it remained a plan and never implemented. However the code 586 was split off from area code 810 and the only reason for the split was to provide numbering relief to area code 810. The 810 was running out of available phone numbers because of the exhausted demands for telephone lines.
The State of Michigan is served by total twelve area codes:
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