The Area Codes of United States of America:
| City/Town or Region | Area code | |
|---|---|---|
| 1. | Idaho | 208 (+1 208) |
| 2. | Illinois | 708 (+1 708) |
| 3. | Illinois | 224 (+1 224) |
| 4. | Illinois | 217 (+1 217) |
| 5. | Illinois | 618 (+1 618) |
| 6. | Illinois | 630 (+1 630) |
| 7. | Illinois | 331 (+1 331) |
| 8. | Illinois | 312 (+1 312) |
| 9. | Illinois | 309 (+1 309) |
| 10. | Illinois | 872 (+1 872) |
| 11. | Illinois | 847 (+1 847) |
| 12. | Illinois | 815 (+1 815) |
| 13. | Illinois | 779 (+1 779) |
| 14. | Illinois | 773 (+1 773) |
| 15. | Indiana | 219 (+1 219) |
| 16. | Indiana | 317 (+1 317) |
| 17. | Indiana | 463 (+1 463) |
| 18. | Indiana | 812 (+1 812) |
| 19. | Indiana | 574 (+1 574) |
| 20. | Indiana | 930 (+1 930) |
| 21. | Indiana | 765 (+1 765) |
| 22. | Indiana | 260 (+1 260) |
| 23. | Iowa | 515 (+1 515) |
| 24. | Iowa | 712 (+1 712) |
| 25. | Iowa | 641 (+1 641) |
| 26. | Iowa | 319 (+1 319) |
| 27. | Iowa | 563 (+1 563) |