| List of Area Codes in Illinois | ||
|---|---|---|
| 217 Area Code | 309 Area Code | 618 Area Code |
| 779 Area Code | 815 Area Code | |
| County List of Area Code 224 | ||
|---|---|---|
| Cook Area code | Kane Area code | Lake Area code |
| McHenry Area code |
| County List of Area Code 312 |
|---|
| Cook Area code |
| County List of Area Code 331 | ||
|---|---|---|
| DuPage Area code | Kane Area code | Cook Area code |
| Will Area code | Kendall Area code |
| County List of Area Code 630 | ||
|---|---|---|
| DuPage Area code | Kane Area code | Cook Area code |
| Will Area code | Kendall Area code |
| County List of Area Code 708 | ||
|---|---|---|
| Cook Area code | DuPage Area code | Will Area code |
| County List of Area Code 773 |
|---|
| Cook Area code |
| County List of Area Code 847 | ||
|---|---|---|
| Cook Area code | Kane Area code | Lake Area code |
| McHenry Area code |
| County List of Area Code 872 |
|---|
| Cook Area code |
