Area code 313, Telephone prefix in Detroit, United States
Area code 313 covers Detroit and its nearest suburbs in Wayne County, spanning fifteen municipalities that include Dearborn and Hamtramck. The zone includes both densely populated downtown neighborhoods and adjacent suburban communities along the edges of the historic core.
The prefix appeared in 1947 as part of the first wave of North American telephone numbering and initially covered all of southeastern Michigan. In 1997 the zone shrank to the tighter metro area when new codes were introduced for the wider suburbs.
Residents treat the prefix as a badge of local pride, wearing it on shirts and using it in shop names across downtown. Visitors see the three digits painted on murals and printed on souvenirs throughout the city.
Callers from outside the region dial 1-313 before the seven-digit number. Calls within the zone often require only the seven digits, depending on the carrier and device.
The state of Michigan holds area code 679 in reserve for a future overlay of the territory. This second number would cover the same zone and allow new lines when existing numbers run out.
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