Illinois Area Codes
Illinois is serviced by various internet service providers offering different area codes. The most common area codes used in the state are 312, 630, 708, and 847. Depending on where you live in Illinois, your ISP may offer services using one or more of these area codes. Different ISPs provide varying levels of speed and reliability depending on the coverage areas they serve within each code range. Hence, it’s essential to research what options are available for your specific location before signing up for an internet plan.
| Illinois | 217 | Springfield, Champaign, Charleston CST |
| 224 | Elgin, Algonquin, Arlington Heights CST | |
| 309 | Peoria, Bloomington, East Moline CST | |
| 312 | Chicago CST | |
| 331 | Aurora, Addison, Bartlett CST | |
| 618 | Belleville, Alton, Carbondale CST | |
| 630 | Aurora, Addison, Bartlett CST | |
| 708 | Cicero, Bellwood, Berwyn CST | |
| 773 | Chicago CST | |
| 779 | Rockford, Belvidere, Crystal Lake CST | |
| 815 | Rockford, Belvidere, Crystal Lake CST | |
| 847 | Elgin, Algonquin, Arlington Heights CST | |
| 872 | Chicago CST |