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20 godz. temu · Time zone: UTC−6 • Summer UTC−5 ... 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. In February 2007, the 815 area code (serving outlying ...
