Area Codes for Chicago, Illinois

Approximately 9 area codes are in use in the City of Chicago and nearby areas, including 312  and 773 , among others. Another handful of area codes is in use across other parts of the state of Illinois.

In Chicago, area codes are always included in written telephone numbers and area codes must be dialed for all calls, even for local calling. All US phone numbers are 10-digits total, including a 3-digit area code and a 7-digit local subscriber number.

Chicago area code information:

Chicago area codes:
312, 773, 872, 708

Area codes are used to route phone calls to a specific geographic area within a country. All area codes in the United States are exactly 3-digits long.

In the past, a given region often had just one area code. Nowadays, many cities and towns in denser urban areas, including Chicago, have 2 or more area codes.

To make an inbound international call (or domestic long distance call) to a Chicago landline or mobile phone, you need to dial the appropriate 3-digit area code, followed by a 7-digit local subscriber number.

If you don't have a fully specified 10-digit phone number, including area code, you will not be able to complete an inbound call.

Lookup Chicago phone numbers

Area Codes Used In & Near Chicago, Illinois

There are currently 9 area codes used, or planned for use, in the Chicago metropolitan. Several of these area codes are relatively recent 'overlay' area codes that were added to provide additional phone number capacity.

Another handful of area codes are used across the rest of the state.

Here are the area codes in use for metro Chicago

Chicago Area Codes

Area Codes Region
Chicago Loop, Near North Side
Chicago, except Loop
Western suburbs
Northern suburbs
Southern suburbs


  • 872 area code is listed twice because it overlays both the 312 and 773 area codes. In service date: 07 Nov 2009
  • 464 area code is a planned overlay area code for 708 area code. In service date: TBD

To accommodate demand for new phone numbers, Illinois uses 'overlay' area codes - meaning that as new phone numbers are needed, a new area code is added within the footprint of an existing area code(s). For instance, the area code 630 was added several years ago within the footprint of the 331 area code.

See maps and other area code listings below for further information.

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Area Codes the Largest Illinois Towns

Here are the area codes for the 25 largest cities and towns in Illinois (in alpha order).

Town Area Code(s)
Chicago area code see above
Arlington Heights area code  224 / 847 
Aurora area code  630 / 331 
Berwyn area code  708 
Bloomington area code  309 
Bolingbrook area code  630 / 331 
Champaign area code  217 
Cicero area code  708 
Decatur area code  217 
Des Plaines area code  224 / 847 
Elgin area code  224 / 847 
Evanston area code  224 / 847 
Joliet area code  815 / 779 
Mount Prospect area code  224 / 847 
Naperville area code  630 / 331 
Oak Lawn area code  708 
Oak Park area code  708 
Palatine area code  224 / 847 
Peoria area code  309 
Rockford area code  815 / 779 
Schaumburg area code  224 / 847 
Skokie area code  224 / 847 
Springfield area code  217 
Waukegan area code  224 / 847 
Wheaton area code  630 / 331 

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Chicago, Illinois Area Code Maps

The following maps show area codes for Chicago and the state of Illinois.

Chicago Area Code Map

Chicago area code map


Illinois Area Code Map

Illinois area code map


Maps may not be completely up to date.

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City Codes vs. Area Codes

In some cases, area codes may be referred to as city codes. However, a 'city code' more correctly refers to the codes used to designate airports and other geographic locations. These codes are issued under the United Nation's UN/LOCODE system and/or the IATA airport coding system. The city code for Chicago is CHI.

Other Area Code Information

Chicago online telephone directories
Chicago dialing steps

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