| List of Area Codes in Illinois | ||
|---|---|---|
| 217 Area Code | 224 Area Code | 309 Area Code |
| 312 Area Code | 773 Area Code | 847 Area Code |
| 872 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 |
