Area code 679 is an inactive telephone area code in the North American Numbering Plan (NANP). In February 2000, the area code was assigned as a second area code for an overlay complex with area code 313 in the county of Wayne in the southeastern part of the U.S. state of Michigan.[1] However, the relief schedule was cancelled in April 2000, and the implementation of the overlay was suspended.[2]
In early 2023, the need for a new area code in the same geographic area of Michigan was reconsidered. Area code 313, which serves the city of Detroit and several of its closest suburbs, may approach exhaustion of available telephone numbers by 2025. According to the Michigan Public Service Commission, the proposed use of area code 679 would overlay numbering plan area 313. Opponents cite the cultural importance and impact of area code 313, in which "313" is often synonymous with the city of Detroit.[3] [4]