The Area Codes of United States of America: City/Town or RegionArea code 1.Idaho208 (+1 208) 2.Illinois708 (+1 708) 3.Illinois224 (+1 224) 4.Illinois217 (+1 217) 5.Illinois618 (+1 618) 6.Illinois630 (+1 630) 7.Illinois331 (+1 331) 8.Illinois312 (+1 312) 9.Illinois309 (+1 309) 10.Illinois872 (+1 872) 11.Illinois847 (+1 847) 12.Illinois815 (+1 815) 13.Illinois779 (+1 779) 14.Illinois773 (+1 773) 15.Indiana219 (+1 219) 16.Indiana317 (+1 317) 17.Indiana463 (+1 463) 18.Indiana812 (+1 812) 19.Indiana574 (+1 574) 20.Indiana930 (+1 930) 21.Indiana765 (+1 765) 22.Indiana260 (+1 260) 23.Iowa515 (+1 515) 24.Iowa712 (+1 712) 25.Iowa641 (+1 641) 26.Iowa319 (+1 319) 27.Iowa563 (+1 563)