Illinois area codes

Explore all 17 area codes in Illinois. Choose a code to see its coverage, dialing rules, and phone lookup.

All 17 area codes in Illinois

  • 217

    Decatur, Danville

  • 224

    Northbrook, Des Plaines

  • 309

    Peoria, Rock Island

  • 312

    the central part of Chicago, Illinois

  • 331

    Naperville, Aurora

  • 447

    Decatur, Danville, Charleston

  • 464

    Cicero, La Grange

  • 618

    Carbondale, Belleville

  • 630

    Naperville, Roselle

  • 708

    La Grange, Blue Island

  • 730

    Carbondale, Centralia, Herrin

  • 773

    much of Chicago outside its central 312 area

  • 779

    Rockford, Joliet

  • 815

    Rockford, Joliet

  • 847

    Schaumburg, Northbrook, Roselle

  • 861

    Peoria, Bloomington, Normal and other communities in central Illinois

  • 872

    the combined 312 and 773 regions of Chicago, Illinois

Illinois area code questions

How many area codes does Illinois have?

Illinois has 17 active geographic area codes in this directory: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872.

Which area code should I choose in Illinois?

Start with the first three digits after +1 on the number you want to check. The codes in this directory are associated with places including Decatur, Northbrook, Peoria, Chicago, Naperville, Cicero, Carbondale, La Grange, Rockford, and Schaumburg. The listed places are examples, not a complete map of each code’s boundaries.

Which Illinois area codes share coverage?

NANPA groups these codes in shared numbering complexes: 217 / 447; 224 / 847; 309 / 861; 312 / 872; 331 / 630; 464 / 708; 618 / 730; 773 / 872; 779 / 815; 312 / 773 / 872. Members can serve overlapping areas; being in the same complex does not necessarily mean identical geographic boundaries.

How do I dial a number in Illinois?

Open the individual area code to check its local dialing rule. For a phone lookup, enter +1 followed by the three-digit area code and the seven-digit number. A state or area code alone is not enough to look up a particular number.

Does an area code from Illinois show where the caller is?

No. An area code describes a number’s assigned region. People can keep numbers after moving, use them while traveling, or place internet-based calls. Caller ID can also be spoofed, so the code does not confirm the caller’s location or identity.