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Area code 313 is one of the original telephone area codes, serving the city of Detroit, Michigan, the city's innermost enclave cities (Hamtramck and Highland Park), Dearborn, Redford, Lincoln Park, Allen Park, Taylor and the Grosse Pointe communities.
It originally served all of southeast Michigan, including Metro Detroit, Flint, and the southern part of Michigan's "Thumb." Due to the rotary dialing technology in use at the time, the North American Numbering Plan wanted to keep the number of "clicks" to a minimum for large cities. With this in mind, Detroit was given an area code with seven clicks.
Due to demand for new phone numbers, area code 810 was created for the northern suburbs, Flint, and the southern Thumb on December 1, 1993. Later, that area would be subdivided further, into 248, largely serving Oakland County, and 586, covering Macomb County. On December 13, 1997, the 313 area was further divided creating the 734 area out of Washtenaw, Monroe, and western Wayne counties.
The area code has been used as a cultural identifier of inner-city Detroit. Rapper Eminem's debut album, Infinite, contains a track titled "313", and in Eminem's movie 8 Mile, "the 313" is used in the protagonist's final rap battle as a toponym to identify those culturally connected to run-down parts of Detroit. His old rap group was called "313."  The group 3 1/3 mentioned in the movie is a reference to the area code. On Snot's debut album Get Some, the sixth track is titled "313". Deep house producer and Detroit native Andrés has released a track entitled "313 Love." Eminem also has a song for Detroit called Detroit city.  Detroit based DJs and producers Chad Parraghi and Nick Bein collaborate under the name "Project 313." 
|Michigan area codes: 231, 248, 269, 313, 517, 586, 616, 734, 810, 906, 947, 989|
|North: 248/947, 586|
|West: 734||Area code 313||East: 519/226|
|South: 519/226, 734|
|Ontario area codes: 226, 249, 289, 343, 365, 416, 519, 613, 647, 705, 807, 905|