Illinois Dialing Codes, Country Codes and Area Codes
| City | Country Codes | Area Codes | Dialing Codes |
|---|---|---|---|
| Algonquin | +1 | 847 | +1 847 |
| Alton | +1 | 730 | +1 730 |
| Arlington Heights | +1 | 847 | +1 847 |
| Aurora | +1 | 630 | +1 630 |
| Bartlett | +1 | 847 | +1 847 |
| Batavia | +1 | 630 | +1 630 |
| Belleville | +1 | 613 | +1 613 |
| Berwyn | +1 | 708 | +1 708 |
| Bloomington | +1 | 309 | +1 309 |
| Burbank | +1 | 818 | +1 818 |
| Calumet City | +1 | 708 | +1 708 |
| Champaign | +1 | 447 | +1 447 |
| Chicago | +1 | 312 | +1 312 |
| Chicago Heights | +1 | 708 | +1 708 |
| Cicero | +1 | 708 | +1 708 |
| Danville | +1 | 217 | +1 217 |
| Decatur | +1 | 217 | +1 217 |
| Des Plaines | +1 | 224 | +1 224 |
| Downers Grove | +1 | 630 | +1 630 |
| Elgin | +1 | 630 | +1 630 |
| Elmhurst | +1 | 630 | +1 630 |
| Evanston | +1 | 847 | +1 847 |
| Glen Ellyn | +1 | 630 | +1 630 |
| Glenview | +1 | 847 | +1 847 |
| Harvey | +1 | 708 | +1 708 |
| Highland Park | +1 | 847 | +1 847 |
| Joliet | +1 | 815 | +1 815 |
| Lombard | +1 | 630 | +1 630 |
| Mundelein | +1 | 847 | +1 847 |
| Naperville | +1 | 630 | +1 630 |
| Northbrook | +1 | 847 | +1 847 |
| Oak Lawn | +1 | 708 | +1 708 |
| Oak Park | +1 | 708 | +1 708 |
| Orland Park | +1 | 708 | +1 708 |
| Oswego | +1 | 331 | +1 331 |
| Palatine | +1 | 224 | +1 224 |
| Park Ridge | +1 | 847 | +1 847 |
| Pekin | +1 | 309 | +1 309 |
| Peoria | +1 | 309 | +1 309 |
| Plainfield | +1 | 815 | +1 815 |
| Quincy | +1 | 217 | +1 217 |
| Rock Island | +1 | 309 | +1 309 |
| Rockford | +1 | 815 | +1 815 |
| Schaumburg | +1 | 847 | +1 847 |
| Skokie | +1 | 847 | +1 847 |
| Springfield | +1 | 417 | +1 417 |
| Tinley Park | +1 | 708 | +1 708 |
| Urbana | +1 | 217 | +1 217 |
| Wheaton | +1 | 630 | +1 630 |
| Wheeling | +1 | 847 | +1 847 |
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