| List of Area Codes in Illinois | ||
|---|---|---|
| 217 Area Code | 309 Area Code | 312 Area Code |
| 331 Area Code | 618 Area Code | 630 Area Code |
| 708 Area Code | 773 Area Code | 872 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 847 | ||
|---|---|---|
| Cook Area code | Kane Area code | Lake Area code |
| McHenry Area code |
