Area code 313 is a telephonearea code in theNorth American Numbering Plan servingDetroit and most of its closest suburbs inWayne County, Michigan. It includes the enclave citiesHamtramck andHighland Park, as well asAllen Park,Dearborn,Dearborn Heights,Ecorse, theGrosse Pointe communities,Harper Woods,Inkster,Melvindale,Lincoln Park,Redford,River Rouge, andTaylor north of Goddard Road and east of Holland Road.
Area code 313 was assigned as one of the original 86 area codes in October 1947, when it was designated to serve the southeastern quadrant of Michigan, includingMetro Detroit,Flint, and the southern part ofThe Thumb. The rest of the eastern half of theLower Peninsula was assigned toarea code 517.
Because of the demand for new telephone service in Detroit's suburbs and neighboring areas, the northern portion, including Detroit's northern suburbs, Flint and the southern Thumb were split off with newarea code 810 on 1 December 1993 with a permissive dialing period that ended on August 10, 1994.[1] On 13 December 1997, the remaining 313 area was reduced to its current size when the western portion, includingAnn Arbor,Monroe County and western anddownriverWayne County, receivedarea code 734 in another split.
In February 2000,area code 679 was reserved for future numbering relief in form of anoverlay complex for the 313 numbering plan area, as part of action for two other overlay plans in the larger Detroit metropolitan area.[2][3] The relief schedule was canceled, however, in April 2000, and implementation of the overlay was suspended.[4] Relief planning remained in progress, but 2021 estimates did not expect 313 to be exhausted until 2025.[5] Opponents of the plan cited the cultural importance and impact of area code 313, in which "313" is often synonymous with the city of Detroit.[6][7] On March 17, 2025, the Michigan Public Service Commission announced that area code 679 has been scheduled to be in-service in an overlay with 313 on November 7, 2025,[8][9] which is the earliest date of central office code activation possible, given that all prefixes in 313 have been assigned. However, the exhaust date of NPA 313 is projected for the fourth quarter of 2027. A permissiveten-digit dialing period for 313 is scheduled for April 7, 2025 through October 7, 2025.[10]
Rappers from Detroit often mention313 in their music in reference to this area and its notoriety. One of the tracks in the 1996Eminem independent debut solo albumInfinite is titled "313". In the 2002 film8 Mile, featuring the artist, the 313 area code is mentioned multiple times, because of the film's setting in Detroit. Eminem's character, B–Rabbit, and his friends call their group "three one third," their nickname for the area code. In the last rap battle of8 Mile the first verse of the rap is "Now everybody from the 313, put your ... hands up and follow me!"[11]
| North:248/947,586 | ||
| West:734 | 313 | East:519/226/548/382 |
| South:519/226/548/382,734 | ||
| Ontario area codes:416/437/647/942,519/226/548/382,613/343/753,705/249/683,807,905/289/365/742 | ||