Illinois Area Codes – List Of Area Codes And Maps

Illinois officially using 13 Illinois Area Codes. First established by AT&T and the Bell System in 1947, 217 covered central Illinois, 312 covered the Chicago metropolitan area, 618 covered southern Illinois including East St. Louis and Carbondale, and 815 covered northern Illinois except Chicago and Quad Cities.

The most recently Joining was 872 in 2009 as an overlap of 312 and 773. Today, 815 is the most populated with an estimated 1.9 million of the state’s 12.9 million residents.

Illinois Area Codes

Illinois officially Using 13 Illinois Area Codes Which Are :

list of the Illinois Area Codes and the regions

217 – Central Illinois ,Effingham, Champaign–Urbana, Decatur, Springfield, Quincy until Illinois’ western border with Missouri and Iowa.

309 – Central-Western Illinois including Bloomington–Normal, Peoria, Moline, and Rock Island.

312 – Chicago, including the central city area Chicago Loop and the Near North Side.

630/331 – West suburbs of Chicago in DuPage County and Kane Country. Illinois Area code 630 was overlap with illinois Area Codes 331 in 2007.

618 – Southern Illinois, including Metro East region of St. Louis suburbs in Illinois and Carbondale

708 – South suburbs and inner west suburbs of Chicago, Oak Park, Oak Lawn, Chicago Heights

773 – Chicago, covers most of the geographical area of Chicago except the downtown Chicago Loop, which is in illinois Area Codes 312.

815/779 – Joliet, Kankakee, LaSalle, DeKalb, and Rockford. illinois Area code 815 overlap with Illinois Area Code 779 in 2007.

847/224 – North and northwest suburbs of Chicago This area includes Evanston, Des Plaines, Waukegan, and most of Elgin. Illinois Area code 847 overlap with Illinois Area Code 224 in 2002.

872 – City of Chicago, overlaping Illinois Area Codes 312 and 773.

History Of Illinois Area Codes

In 01/01/1947 Illinois Area codes 217 was Out into service.1957 area code 217 was divide, along with a portion of area code 815, to form area code 309.

In 01/01/1947
Area code 312 was out into service. In 1989 Area code 312 was break to form area code 708. On 1996 area code 312 was divide again to form area code 773. In 2009 area code 312 Overlap with area code 872.

In 01/01/1947
Area code 815 was Put on into service. Year 1957 area code 815 was divide, along with a part of area code 217, to develop area code 309. In 2007 area code 815 overlap with area code 779.

In 01/01/1957
Area code 309 was Put on into service. Area code 309 was created from a Division of area codes 217 and 815.

In 11/11/1989
Area code 708 was Out into service. Then in 1996 Part of area code 708 were break to form area codes 847 and 630. Area code

In 01/20/1996
Area code 847 was out Into service. Area code 847 created from a division of area code 708. In 1998 area code 847 Overlap with area code 224

In 08/03/1996
Area code 630 was Goes Out Into service. Area code 630 was develop from a division of area code 708. In 2007 area code 630 overlap with area code 331.

In 10/12/1996
Area code 773 was Put On into service. Area code 773 was develop from a breaking of area code 312. In 2009 area code 773 overlap with area code 872.

In 01/05/2002
Area code 224 was out into service. Area code 224 is an overlap of area code 847.

In 03/17/2007
Area code 779 was Goes Out Into service. Area code 779 is an overlap of area code 815.

In 10/07/2007
Area code 331 was out into service. Area code 331 is an overlap of area code 630.

In 11/07/2009
Area code 872 was Put On Into service. Area code 872 is an overlap of area codes 312 and 773.

Illinois Area Codes

What Is Area Code?

Area Code Is A Three-digit code that Finds one of the telephone areas into which the U.S. and other countries are divided and that is the local telephone number when dialing a call between areas.

Why are area codes added?

Area codes are added when the current number expires. In North America, each area code has a potential capacity of about 8 million unique phone numbers. Increased use of cellular phones, modems, and Internet access may require existing telephone number resources, additional area codes may be required, according to Nestar.


Once the new area code starts being assigned, there is usually a six-month period of transition, where customers are encouraged, but not required, to use the new code, but seven-digit. Dialing is allowed. After six months, callers are required to use the appropriate area code and telephone number.

Other Area Codes

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