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List of Illinois area codes
Original North American area codes
Area codes 708 and 464
Area codes 217 and 447
Area codes 847 and 224
It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708. On October 24, 2021, area code 309 was transitioned to ten-digit dialing, despite not being part of an overlay complex, in which multiple area codes are assigned to a numbering plan area. The area code had telephone numbers assigned for the ...
Area code 312
Area codes 309 and 861. Area code 312. Area code 447. Area codes 618 and 730. Area codes 630 and 331. Area codes 708 and 464. Area code 773. Area codes 815 and 779. Area codes 847 and 224.