Authorized all the way in which again in 1999 by the Illinois Commerce Fee (ICC), the brand new 464 space code will probably be added as a reduction plan for Numbering Plan Space 708 which covers the world south of Chicago together with these bigger communities: Beecher, Berwyn, Chicago Heights, Cicero, Crest Hill, Crete, Hickory Hills, Oak Park, and so forth. All calls within the space will probably be dialed utilizing 1+10 digits with the activation of the brand new overlay complicated 708/464.
See official NANPA announcement and map of 708/464 overlay complex (PDF doc).
Go to area code 464 web page for an inventory of cities served, map and different information.