Illinois Area Codes — 17 Codes
Illinois has 17 North American Numbering Plan area codes, covering about 27,172,145 people. The table lists each code with its largest towns, population and overlaps.
All area codes in Illinois
| Area code | Largest towns | Population | ZIP codes | Overlaps |
|---|---|---|---|---|
| 312 | Chicago, Wheeling, Westmont | 2,795,182 | 90 | 773, 872 |
| 773 | Chicago | 2,694,535 | 84 | 312, 872 |
| 872 | Chicago | 2,694,535 | 84 | 773, 312 |
| 847 | Elgin, Waukegan, Des Plaines | 2,332,627 | 117 | 224 |
| 224 | Elgin, Waukegan, Des Plaines | 2,190,182 | 109 | 847 |
| 630 | Aurora, Naperville, Elgin | 1,832,033 | 97 | 331 |
| 708 | Cicero, Schaumburg, Orland Park | 1,731,186 | 100 | 464 |
| 815 | Rockford, Joliet, Plainfield | 1,706,456 | 273 | 779 |
| 779 | Rockford, Joliet, Plainfield | 1,561,235 | 204 | 815 |
| 331 | Aurora, Naperville, Schaumburg | 1,454,618 | 78 | 630 |
| 464 | Cicero, Orland Park, Berwyn | 1,281,961 | 69 | 708 |
| 618 | Belleville, East Saint Louis, Granite City | 1,184,182 | 333 | — |
| 217 | Springfield, Champaign, Decatur | 1,094,714 | 354 | 447 |
| 309 | Peoria, Bloomington, Normal | 887,272 | 242 | — |
| 447 | Springfield, Champaign, Decatur | 834,451 | 191 | 217 |
| 730 | Belleville, East Saint Louis, Granite City | 619,566 | 118 | 618 |
| 861 | Peoria, Moline, Pekin | 277,410 | 44 | 309 |
Largest cities in Illinois
Chicago 312, 773, 872Aurora 331, 630Rockford 779, 815Naperville 331, 630Springfield 217, 447Joliet 779, 815Peoria 309, 861Elgin 224, 630, 847Plainfield 779, 815Waukegan 224, 847Champaign 217, 447Belleville 618, 730Des Plaines 224, 847Bloomington 309Cicero 464, 708Evanston 224, 847Arlington Heights 224, 847Decatur 217, 447Schaumburg 224, 331, 630, 708, 847Palatine 224, 847Orland Park 464, 708Berwyn 464, 708Round Lake 224, 847Tinley Park 464, 708Skokie 224, 847Crystal Lake 779, 815Wheaton 331, 630Downers Grove 331, 630Saint Charles 331, 630Oak Lawn 464, 708Mchenry 779, 815Mount Prospect 224, 847Glenview 224, 847Normal 309Oak Park 708Lombard 331, 630Chicago Heights 464, 708Hoffman Estates 224, 847Quincy 217, 447Urbana 217, 447
Frequently asked questions
How many area codes does Illinois have?
Illinois uses 17 area codes.
What is the main area code in Illinois?
312 covers the largest population in Illinois.
How do I find the area code for a town?
Open the town in the city list above; each town page lists every area code assigned to it.