What are the area codes for Illinois?

The telephone country code for the United States is +1. The area codes for Illinois are: 217 = Springfield, Champaign;

224 = (overlay of 847);

309 = Bloomington, Peoria, Quad Cities;

312 = downtown Chicago;

331 = (overlay of 630);

447 = (planned overlay of 217);

618 = East St. Louis, Collinsville;

630 = Aurora, Hinsdale;

708 = Cicero;

730 = (planned overlay of 618);

773 = Chicago (outside downtown);

779 = (overlay of 815);

815 = Rockford, Joliet;

847 = Roselle, Northbrook, Elk Grove Village;

872 = (overlay of both 312 and 773).