The area code 679 is located in Detroit, Michigan.
Area code 679 serves the same footprint as area code 313 in and around Detroit, Michigan, as an overlay designed to add more phone number capacity. This overlay keeps the familiar 313 boundary in core Wayne County, covering the city and nearby communities, without changing existing numbers. It supports one of America’s most storied urban centers—Detroit, known as the Motor City and the birthplace of modern auto manufacturing. When 679 is in effect alongside 313, local calls in the 313/679 region use ten-digit dialing, ensuring smooth growth as new phone numbers are assigned.
Major locations in the 313/679 service area include:
Landmarks tied to these area codes include the Detroit Riverwalk, the Renaissance Center on the riverfront, Belle Isle Park, and the Motown Museum, celebrating the city’s deep music history. Detroit sits along the Detroit River between Lake St. Clair and Lake Erie, linking the Great Lakes and Canada, which makes this area code region especially significant for industry and culture. The overlay approach means new phone numbers may use 679 while long-time numbers keep 313—both working across the same neighborhoods and businesses.
Area code 679 was assigned as an overlay to support the long-standing 313 territory, rather than split it, which helps residents and companies keep their established contacts. Overlays like 679 do not require changing existing phone numbers; they simply add new numbering options in the same geographic area. This setup helps meet demand from mobile phones, businesses, and new services, while preserving local identity across Detroit’s communities.
Statistic: Area code 313 dates back to 1947, one of the original North American area codes. (Source: North American Numbering Plan Administrator)