Area Codes United States of America The Area Codes of United States of America: City/Town or Region Area code 1. Maine 207 (+1 207) 2. Maryland 301 (+1 301) 3. Maryland 667 (+1 667) 4. Maryland 240 (+1 240) 5. Maryland 443 (+1 443) 6. Maryland 410 (+1 410) 7. Massachusetts 774 (+1 774) 8. Massachusetts 339 (+1 339) 9. Massachusetts 978 (+1 978) 10. Massachusetts 857 (+1 857) 11. Massachusetts 413 (+1 413) 12. Massachusetts 781 (+1 781) 13. Massachusetts 351 (+1 351) 14. Massachusetts 508 (+1 508) 15. Massachusetts 617 (+1 617) 16. Michigan 616 (+1 616) 17. Michigan 231 (+1 231) 18. Michigan 248 (+1 248) 19. Michigan 734 (+1 734) 20. Michigan 810 (+1 810) 21. Michigan 906 (+1 906) 22. Michigan 947 (+1 947) 23. Michigan 989 (+1 989) 24. Michigan 269 (+1 269) 25. Michigan 313 (+1 313) 26. Michigan 517 (+1 517) 27. Michigan 586 (+1 586) 28. Minnesota 612 (+1 612) 29. Minnesota 507 (+1 507) 30. Minnesota 320 (+1 320) 31. Minnesota 952 (+1 952) 32. Minnesota 763 (+1 763) 33. Minnesota 218 (+1 218) 34. Minnesota 651 (+1 651) 35. Mississippi 769 (+1 769) 36. Mississippi 662 (+1 662) 37. Mississippi 228 (+1 228) 38. Mississippi 601 (+1 601) 39. Missouri 636 (+1 636) 40. Missouri 417 (+1 417) 41. Missouri 660 (+1 660) 42. Missouri 314 (+1 314) 43. Missouri 573 (+1 573) 44. Missouri 816 (+1 816) 45. Montana 406 (+1 406)