Illinois Area Codes

Illinois -- The East North Central state has reserved thirteen area codes. Standard Time Zone floowied in the state is Central Time Zone.
List of Illinois Area Codes is given below: 

Area Code 217 Area Code 224 Area Code 309 Area Code 312 Area Code 331

Area Code 464 Area Code 618 Area Code 630 Area Code 708 Area Code 773

Area Code 815 Area Code 847 Area Code 872

Major companies providing telephone services in Illinois are:

• ALLTEL COMMUNICATIONS, INC. - AR
• AT&T LOCAL
• BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL
• CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL
• CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA
• DELTACOM, INC. - AL
• LEAP WIRELESS INTL, INC. DBA CRICKET COMM, INC.
• LEVEL 3 COMMUNICATIONS, LLC - CA
• MOUNTAIN TELECOMMUNICATIONS, INC. - CLEC
• NETWORK SERVICES LLC
• NEW CINGULAR WIRELESS PCS, LLC
• NEXTEL COMMUNICATIONS, INC.
• O1 COMMUNICATIONS, INC. - CA
• PAC - WEST TELECOMM, INC.
• PACIFIC BELL
• QWEST CORPORATION
• SOUTHWESTERN BELL
• SPRINT SPECTRUM L.P.
• TELCOVE OPERATIONS, INC. - AL
• TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO
• T-MOBILE USA, INC.
• TW TELECOM OF CALIFORNIA LP - CA
• USA MOBILITY WIRELESS, INC.

A brief description of Illinois Area Codes is given below:

It is one of the original area codes created in 1947 for providing telephone services in Central Illinois. Some of the areas served by the code 217 are Danville, Champaign-Urbana, Decatur, Springfield and Quincy.

It was created as an overlay to 847 on 5th January, 2002. Area Code 847 was overlaid because it was rapidly running out of the available phone numbers. Area Code 224 is serving areas of Northern Illinois. Illinois is East North Central State of United States served by area code 224, 779, 8847 and 815 together. The code 224 is providing telephone services in counties of Cook, Dupage, Kane, Lake and Mchenry.

It was created in 1966 for providing telephone services in Central Illinois.

It was created for providing telephone services in Chicago which is the largest city of Illinois. The code is one of the original area codes created in 1947.

It was created as an overlay area to area code 630 on 7th October 2007. The code 331 was overlaid for fulfilling the sky-high going demands for telephone lines. It is providing telephone services in the densely inhabited areas of Chicago.

This code has been kept reserved for providing numbering relief to area code 708 in future -- if required.

It was created in 1947 for providing telephone services in Southern Illinois -- the "Little Egypt".

It was formed in 1996 for providing telephone services in heavily populated areas of Chicago. Chicago is one of the biggest and heavily populated cities of Illinois State of United States.
The code 630 serves the Dupage County as well as western suburbs of the city of Chicago. Area code 331 was added as an overlay to the area 630 on 7th October 2007.

It was created in 1989 as a result in split of area code 312. The code 708 provides telephone services in Chicago.

It was created in 1996 as a result in split of the area code 312. The code serves the city of Chicago situated in the Illinois State of United States.

It is one of the original area codes created in 1947. The code 815 was running out of available phone numbers rapidly around 2007 and to overcome the problem it was overlaid by area code 779 on 17th March 2007. It is providing telephone services in Northern Illinois.

It is a North American telephone area code providing telephone services in Northern Illinois. The Code 847 was formed on 20th January, 1996 when area code 708 got split in order to fulfill the exhausted demands for telephone lines resourcefully. In 2002, area code 224 was introduced as an overlay to area code 847.

It is reserved for providing numbering relief to area codes 312 and 773. The code 872 will be added as an overlay to these two particular area codes and the geographic boundaries will remain same for existing as well as newly created code.