The local area codes are 773 and 872 in the city limits, and 708 in the neighboring suburbs.
Chicago added the 872 area code citywide on November 7, 2009. Since 872 will overlap both 773 and 312, one must dial the full 11-digit number in any part of the city. For those of us used to ordering pizza from Elmwood Park, this change may actually make things less confusing.
Illinois Area Codes (Wikipedia)
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