Illinois |
| State of Illinois - Phone Code and Area Codes for Mobile, Whatsapp and Text Messages |
| Phone and Whatsapp Codes in Illinois / IL
- Area Code : 312 Chicago |
| Area Code : 773 Chicago |
| Area Code : 630 Chicago suburbs |
| Area Code : 847 Chicago suburbs |
| Area Code : 708 NorthEast |
| Area Code : 815 Northern |
| Area Code : 224 |
| Area Code : 331 |
| Area Code : 464 overlay deferred - 872 overlay deferred |
| Area Code : 217 South |
| Area Code : 618 Southern |
| Area Code : 779 |
| Area Code : 779 |
| Area Code : 309 West Central - |
| US Code List of Codes in USA. Area Code and Phone Information by City and State. |