Area code 312 serves Chicago which is the largest city of Illinois State of the United States. The code was created in 1947 and covers majority areas of Chicago -- the third-most heavily populated city in the U.S. Illinois is East North Central state which is one of the geographic partitions of United States composed of five states:
- Illinois
- Indiana
- Michigan
- Ohio
- Wisconsin.
Chicago is covered by six area codes:
- Code 312 (created in 1947)
- Code 630 (created in 1996)
- Code 331 (created in 2007)
- Code 708 (created in 1989)
- Code 773 (created in 1996)
- Code 464 (Not implemented yet)
The code 312 was running out of available phone numbers in 1989 and to handle the issue - area code 708 was created. The 312 area code suburbs were assigned with the code 708. No more changes were made to Chicago area codes until 1996 when the area codes 773, 847 and 630 were created.
Areas are either split or overlaid so that to fulfill the exhausted demands for telephone lines. Areas are considered to be exhausted when available phone numbers are insufficient and it becomes impossible to facilitate the customers with telephone connections. To overcome the problem, areas are split into further smaller areas so that to provide telephone connections resourcefully.
Area 312 is surrounded from four sides by other area codes as:
- West: 773
- North: 773
- East: Lake Michigan
- South: 773
List of Counties:
Counties covered by area 312 are:
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List of Cities:
Area 312 cities are:
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Leading institutes, ISPs and Telephone companies serving areas of 312:
Some of the leading educational institutions serving the area of 312 are:
- Aurora University of Chicago Campus (Ph: 312-3571080)
- Illinois Institute of Technology (Ph: 312-5673000)
- Indiana University Foundation (Ph: 312-4442027)
- Loyola University Chicago (Ph: 312-9156060)
Some of the ISPs offering dialup and dedicated services for the people of 312 areas are:
- A plus Access
- A Silicon Networks
- A Value Access Providers--- VAP
- Ace Dialup
- Amerilinx Inc.
- Aristotle.net
- Best Rate ISP
- Bestyet Communications
- Catholic Internet Services
- Covad Communications
Some of the main carriers and telephone companies for 312 areas are:
- ALLTEL COMMUNICATIONS, INC. - AR
- ALLTEL MOBILE COMMUNICATIONS, INC. - ALABAMA
- AT&T LOCAL
- COOK TELECOM, INC.
- COX CALIFORNIA TELCOM, INC. - CA
- DELTACOM, INC. - AL
- LEAP WIRELESS INTL, INC. DBA CRICKET COMM, INC.
- MPOWER COMMUNICATIONS CORP. - CA
- NETWORK SERVICES LLC
- NEW CINGULAR WIRELESS PCS, LLC
- NEXTEL COMMUNICATIONS, INC.
- O1 COMMUNICATIONS, INC. - CA
- PACIFIC BELL
- QWEST CORPORATION
- SOUTHWESTERN BELL
- SPRINT SPECTRUM L.P.
- T-MOBILE USA, INC.
- VERIZON CALIFORNIA INC.-CA (GTE)
- XO CALIFORNIA, INC.
Reverse Phone Check for the area code 312:
It's boring to search phone directory manually - isn't it? Phone directory doesn't provide you information if the only thing you have is phone number. However do consider the option of browsing reverse phone directory for searching the number. All you have to do is to select the company providing you the services for reverse phone number search. Browse reverse lookup directory, enter the phone number along with the code of the area and get complete information about any number.
If the number to be searched starts with the code "312" then run Reverse Phone Lookup for area code 312. You can find any of your missing friends through reverse directory and you can get rid of annoying calls as well.