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Area Code 331


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Area code 331 was created as an overlay area to area code 630 on 7th October 2007. Area 331 was overlaid in order to fulfill the sky-high going demands for telephone lines. The 331 area code serves the densely inhabited areas of Chicago -- one of the biggest and densely inhabited cities of Illinois State of United States.

Illinois is East North Central state which is one of the nine geographic partitions of United States ? it is composed of total five states:

  • Illinois
  • Indiana
  • Michigan
  • Ohio
  • Wisconsin.

There are total six area codes serving the city of Chicago.

  • 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)

Ten-digit dialing became mandatory in both area codes after the implementation of overlay area 331. Standard time zone followed by all these area codes is Central Time Zone. 

Areas are either split or overlaid when they run out of the available phone numbers ? this actually is an exhaustion stage where no more phone connections can be provided to customers because of the lack of available numbers. Areas are split into further smaller areas so that to prevail over the problem. Newly born areas are assigned with new and unique codes. Adding new codes in existing area make it possible to provide telephone services more efficiently and resourcefully. By doing so it becomes possible to repeat the phone number while keeping the code unique.

Area codes surrounding area 331 from four sides are:

  • West: 815/779
  • North: 847/224
  • East: area code 708
  • South: 815/779

List of Counties:


The 331 area code covers the only county is KANE.

List of Cities:


  • AURORA
  • DOWNERS GROVE
  • ELMHURST
  • GENEVA
  • LOMBARD
  • NAPERVILLE
  • OSWEGO
  • ROSELLE
  • SAINT CHARLES
  • WEST CHICAGO

ISPs and Telephone companies serving the 331 area code:


Some of the ISPs offering dialup and dedicated services for the people of 331 areas are:
  • A Value Access Providers--- VAP
  • Ace Dialup
  • Alacrity Internet
  • Bayarea Internet Solutions
  • Best Rate ISP
  • Catholic Internet Services
Some of the main carriers and telephone companies for 331 areas are:
  • ACS OF ANCHORAGE, INC.
  • ALLTEL COMMUNICATIONS, INC. - AR
  • AT&T LOCAL
  • BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL
  • BROADWING COMMUNICATINS. LLC - CA
  • CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA
  • CENTURYTEL OF NORTHWEST ARKANSAS, LLC -RUSSELLVILL
  • MCI WORLDCOM COMMUNICATIONS, INC., CA
  • NEW CINGULAR WIRELESS PCS, LLC
  • NEW CINGULAR WIRELESS PCS, LLC - GA
  • NEXTEL COMMUNICATIONS, INC.
  • O1 COMMUNICATIONS, INC. - CA
  • PAC - WEST TELECOMM, INC.
  • PACIFIC BELL
  • QWEST CORPORATION
  • SOUTHERN COMMUNICATIONS SERVICES
  • T-MOBILE USA, INC.
  • VERIZON CALIFORNIA INC.-CA (GTE)
  • XO CALIFORNIA, INC.

Reverse Phone Check for area code 331:

Reverse phone lookup provides you the owner identity of any phone number within no time. White phone directories are also very useful but they don?t work in case of mobile numbers. Phone directories never entertain you if you need to know the name behind that number. However reverse phone directory maintains database of phone numbers. Just get access to reverse phone directory -- enter the number along with the code ? click on the search button and get the details on any number you need.

Reverse phone directory for area code 331 contains complete database of all phone numbers registered with ?331? code. Explore area code directory for more details on the codes and their associated areas.

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