Area code 312 - Wikipedia Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs
312 Area Code Phone Numbers | Whitepages Browse area code 312 phone numbers, prefixes and exchanges The 312 area code serves Chicago, Willowbrook, Elgin, Arlington Heights, Naperville, covering 23 ZIP codes in 4 counties
312 area code — information, time zone, map 312 is an area code located in the state of Illinois, US The largest city it serves is Chicago Find out where 312 area code zone from, which states, counties and cities it covers Get the most exact information on time zones here
Area code 312 - Simple English Wikipedia, the free encyclopedia Area code 312 Area code 312 is an area code in Illinois It was one of the first area codes created in 1947 It initially covered the entire northeastern portion of Illinois, but after it was split by 708 in 1989, 630, 847, and 773, all in 1996, it now covers only downtown Chicago, with 708 and 773 covering the rest of Chicago