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In March 2007, an overlay plan was created for NPA 630 adding area code 331, and 779 was added to 815. With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the ...
In 2016, area code 614 was overlaid with 380 in the Columbus/Central Ohio area for the same reason. In 2020, 326 was added as an all services overlay for 937. Area code 283 was added as an overlay for 513 on April 28, 2023. [2] [3] Area code 436 went into service on March 1, 2024, as an overlay of 440. [4]
The numbering plan area is completely surrounded by area code 773, which serves the rest of Chicago. Both area codes form an overlay complex with area code 872. 312 is an enclave area code, and is roughly bounded by North Avenue on the north, Western Avenue on the west, and 35th Street on the south, with Lake Michigan to the east. In terms of ...
An area code overlay is a numbering plan area ... Central and southeastern Ohio: 223: 717: ... Northern suburbs of Chicago, Illinois: 226, 382, 548: 519:
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, 2009. [1]
Area code 630 is the parent area code of the numbering plan area, created in a three-way area code split of area code 708 on August 3, 1996, with the southern suburbs keeping 708 and the northern suburbs receiving 847. Within a decade, 630 was close to exhaustion due to the growth of the Chicago suburbs and the proliferation of cell phones and ...
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
As a result, the city of Chicago was divided into two area codes, 312 and 773. Rather than divide the city by a north–south area code, the central business district retained the 312 area code, while the remainder of the city took the new 773 code. In 2002, the 847 area code was supplemented with the overlay area code 224.