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Area code 312

 

312 is an area code in these Illinois areas:

    American Express

    American National Bank

    Ameritech

    Area Office

    Cardiss Collins P&dc

    Chestnut Street

    Chicago

    Fleet

    Fort Dearborn

    Harris Bank

    Harwood Heights

    Haymarket

    Loop

    Loop Station

    Nancy B Jefferson

    Norridge

    Ontario Street

    Pilsen

    Pnc Bank

    Regional Office

    State Of Il



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Wikipedia: Area code 312
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Area code 312 encompasses the Chicago Loop and surrounding areas of the city of Chicago, Illinois. It is roughly bounded by North Avenue on the north, Ashland Avenue on the west, Lake Michigan on the east, and 31st Street on the south. By size, it is one of the smallest area codes in the nation, encompassing only a few square miles.

Contents

History

Area code 312 was one of the original 86 area codes created in 1947, then called "Numbering Plan Areas". With the rotary dialing technology available at the time, care was given to keep the number of "clicks" to a minimum for large cities, hence Chicago being assigned a code with only six clicks.

The first production #4ESS toll switch was installed in January 1976.[1]

Area-code split

Until 1989, 312 included most of the Chicago metropolitan area; at that time, the suburbs became area code 708. In 1996, most of the city split off into 773, after the northern suburbs and far-western suburbs split into area codes 847 and 630 respectively, while the southern and near-western suburbs kept 708.[2] New area code 872 was instituted as an overlay of 312 and 773 on November 7, 2009.[3]

In popular culture

See also

References

  1. ^ Telephone World
  2. ^ "AT&T Area Code History: Illinois". AT&T. 2009. http://www.att.com/gen/general?pid=1717. Retrieved 19 August 2009. 
  3. ^ Williams, Tera (7 November 2009). "Chicago's New Area Code 872 Connects Today". Fox Chicago News. http://www.myfoxchicago.com/dpp/news/metro/Chicago_cell_phone_users_must_dial_872_new_area_code_october_7_2009. Retrieved 7 November 2009. 
  4. ^ "312 Urban Wheat". Goose Island Brewery. 2009. http://www.gooseisland.com/pages/312_urban_wheat/16.php. Retrieved 19 August 2009. 
  5. ^ "Dining-Hotel Allegro". Hotel Allegro. 2009. http://www.allegrochicago.com/alleg_ser_dining.html. Retrieved 19 August 2009. 
  6. ^ Area 312 at Allmusic

External links

State of Illinois area codes: 217, 224, 309, 312, 331, 618, 630, 708, 773, 779, 815, 847, 872
North: 773
West: 773 area code 312 East: Lake Michigan
South: 773



 
 
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