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Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs. The numbering plan area is completely surrounded by area code 773 , which serves the rest of Chicago.
In 1989, area code 708 was created for all of the suburbs in the Chicago metropolitan area while the city of Chicago kept the original 312. Area codes 847 (northern suburbs) and 630 (western suburbs) were created from a split of suburban area code 708 in 1996.
Coordinates: 41°50′N 88°06′W. All NPAs within Illinois. Area codes 630 and 331 are telephone area codes in the North American Numbering Plan (NANP) for portions of Chicago 's near and far western suburbs, including the majority of DuPage County, Illinois. To the northwest, the numbering plan area (NPA) also includes a small portion of ...
Area codes 708 and 464 are telephone area codes in the North American Numbering Plan (NANP) for the southern and western suburbs of Chicago in the U.S. state of Illinois. The numbering plan area comprises most of western and southern Cook County, and eastern and southern Will County . Area code 708 was created on November 11, 1989, in a split ...
Area code 872. Coordinates: 41°52′48″N 87°37′54″W. All NPAs within Illinois. Area code 872 is a telephone area code in the North American Numbering Plan for Chicago in the U.S. state of Illinois. It is an overlay code for a numbering plan area that comprises those of area codes 312 and 773. The overlay commenced service on November 7 ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Coordinates: 42°09′46″N 87°53′15″W. NPA codes of Illinois. Area codes 847 and 224 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Illinois. The numbering plan area (NPA) comprises the northeastern part of Illinois and many northern suburbs of Chicago. This includes most of Lake County, the ...
Area code 773 serves Chicago, Illinois, outside the Loop and the innermost neighborhoods. Originally, all of Chicago and its suburbs used area code 312 . In 1989, area code 708 was created for the suburbs, leaving the city in area code 312.