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Area code 312 is located in Illinois. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.
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. The numbering plan area is completely surrounded by area code 773, which serves the rest of Chicago.
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.
Find 312 area code details including city, time zone, and map. Lookup area code 312 phone number, name, and location.
Area Code 312 - Illinois . State: Illinois: Major City: Chicago: Current Time: ... Cities in Area Code 312. Chicago. Area Code 312 Prefixes. Prefix City County Carrier Type Assigned (312) 200: Adams: Ameritech Illinois: Landline (312) 201: Chicago, IL Adams: Ameritech Illinois: Landline (312) 202: Chicago, IL ...
telephone number / prefix in any area code. This is a directory of U.S./Canada/Caribbean telephone prefixes and their geographical locations. Each area code has its own search page. This area code /prefix location search service is compiled from available information.
What is Area Code 312? The 312 area code is Chicago’s historic telephone code, established by the North American Numbering Plan Administrator (NANPA) in 1947. It is one of the leading telephone codes for this central business area of Chicago, including downtown and the Chicago Loop, with its vibrant music scene and great architecture.
