Illinois Area Codes

Located in the Midwestern part of United States, Illinois is the fourth most populous state in the country. The state of Illinois is limited to Wisconsin to the north, Indiana to the east, Kentucky to the south, and Iowa and Missouri to the west. Illinois’ history is quite similar to that of many other American states: the region belonged to France until 1763, when it came under British rule. After the United States War of Independence in 1783, the Americans took control of the territory and, on December 3, 1818, created the State of Illinois.

  • Abbreviationfinder.org: Find major meanings of abbreviation IL including the most common definition – Illinois. Also see the list of other meanings in addition to Illinois.
  • Countryaah.com: Provides ranking of top ten cities and towns in Illinois by population. Also includes alphabetical list of and profile of each city of Illinois.

Geographically, it is characterized by its rather flat terrain. Illinois has more than 500 rivers in its territory, such as the Mississippi River and the Illinois River. The state is well known for its relatively unstable climate. This is due to the fact that its terrain is not very hilly, which allows air masses to enter more easily. Average temperatures are 25ºC in summer and -5ºC in winter.

Illinois is one of the most important American states. Its largest city, Chicago, is the second largest financial hub in the United States, second only to New York City. Among the most important sources of income in the State, we can mention the provision of services, the manufacturing industry, agriculture and tourism.

Map of Area Codes in Illinois

Area Code Map of Illinois

Illinois consists of the following area codes. Click on the area code to show the cities in that area code.

Illinois Area Codes by County

The area code of 217 is used in the following 38 counties:

  1. Adams, IL
  2. Bond, IL
  3. Brown, IL
  4. Cass, IL
  5. Champaign, IL
  6. Christian, IL
  7. Clark, IL
  8. Coles, IL
  9. Cook, IL
  10. Crawford, IL
  11. Cumberland, IL
  12. Dewitt, IL
  13. Douglas, IL
  14. Edgar, IL
  15. Effingham, IL
  16. Ford, IL
  17. Greene, IL
  18. Hancock, IL
  19. Henderson, IL
  20. Iroquois, IL
  21. Jasper, IL
  22. Logan, IL
  23. Macon, IL
  24. Macoupin, IL
  25. Madison, IL
  26. Mason, IL
  27. Mcdonough, IL
  28. Menard, IL
  29. Montgomery, IL
  30. Morgan, IL
  31. Moultrie, IL
  32. Piatt, IL
  33. Pike, IL
  34. Sangamon, IL
  35. Schuyler, IL
  36. Scott, IL
  37. Shelby, IL
  38. Vermilion, IL

The area code of 224 is used in the following 5 counties:

  1. Cook, IL
  2. Dupage, IL
  3. Kane, IL
  4. Lake, IL
  5. Mchenry, IL

The area code of 309 is used in the following 20 counties:

  1. Bureau, IL
  2. Dewitt, IL
  3. Fulton, IL
  4. Henderson, IL
  5. Henry, IL
  6. Knox, IL
  7. Logan, IL
  8. Marshall, IL
  9. Mason, IL
  10. Mcdonough, IL
  11. Mclean, IL
  12. Mercer, IL
  13. Peoria, IL
  14. Rock Island, IL
  15. Schuyler, IL
  16. Stark, IL
  17. Tazewell, IL
  18. Warren, IL
  19. Whiteside, IL
  20. Woodford, IL

The area code of 312 is used in the following 3 counties:

  1. Cook, IL
  2. Dupage, IL
  3. Lake, IL

The area code of 331 is used in the following 5 counties:

  1. Cook, IL
  2. Dupage, IL
  3. Kane, IL
  4. Kendall, IL
  5. Will, IL

The area code of 618 is used in the following 39 counties:

  1. Alexander, IL
  2. Bond, IL
  3. Calhoun, IL
  4. Clay, IL
  5. Clinton, IL
  6. Crawford, IL
  7. Edwards, IL
  8. Effingham, IL
  9. Fayette, IL
  10. Franklin, IL
  11. Gallatin, IL
  12. Greene, IL
  13. Hamilton, IL
  14. Hardin, IL
  15. Jackson, IL
  16. Jasper, IL
  17. Jefferson, IL
  18. Jersey, IL
  19. Johnson, IL
  20. Lawrence, IL
  21. Macoupin, IL
  22. Madison, IL
  23. Marion, IL
  24. Massac, IL
  25. Monroe, IL
  26. Perry, IL
  27. Pope, IL
  28. Pulaski, IL
  29. Randolph, IL
  30. Richland, IL
  31. Saint Clair, IL
  32. Saline, IL
  33. Shelby, IL
  34. Union, IL
  35. Wabash, IL
  36. Washington, IL
  37. Wayne, IL
  38. White, IL
  39. Williamson, IL

The area code of 630 is used in the following 6 counties:

  1. Cook, IL
  2. Dupage, IL
  3. Kane, IL
  4. Kendall, IL
  5. Lake, IL
  6. Will, IL

The area code of 708 is used in the following 4 counties:

  1. Cook, IL
  2. Dupage, IL
  3. Lake, IL
  4. Will, IL

The area code of 773 is used in the following 2 counties:

  1. Cook, IL
  2. Dupage, IL

The area code of 779 is used in the following 22 counties:

  1. Boone, IL
  2. Bureau, IL
  3. Carroll, IL
  4. Dekalb, IL
  5. Grundy, IL
  6. Henry, IL
  7. Iroquois, IL
  8. Jo Daviess, IL
  9. Kane, IL
  10. Kankakee, IL
  11. Kendall, IL
  12. La Salle, IL
  13. Lee, IL
  14. Livingston, IL
  15. Marshall, IL
  16. Mchenry, IL
  17. Ogle, IL
  18. Putnam, IL
  19. Stephenson, IL
  20. Whiteside, IL
  21. Will, IL
  22. Winnebago, IL

The area code of 815 is used in the following 26 counties:

  1. Boone, IL
  2. Bureau, IL
  3. Carroll, IL
  4. Cook, IL
  5. Dekalb, IL
  6. Ford, IL
  7. Grundy, IL
  8. Henry, IL
  9. Iroquois, IL
  10. Jo Daviess, IL
  11. Kane, IL
  12. Kankakee, IL
  13. Kendall, IL
  14. La Salle, IL
  15. Lake, IL
  16. Lee, IL
  17. Livingston, IL
  18. Marshall, IL
  19. Mchenry, IL
  20. Mclean, IL
  21. Ogle, IL
  22. Putnam, IL
  23. Stephenson, IL
  24. Whiteside, IL
  25. Will, IL
  26. Winnebago, IL

The area code of 847 is used in the following 5 counties:

  1. Cook, IL
  2. Dupage, IL
  3. Kane, IL
  4. Lake, IL
  5. Mchenry, IL

The area code of 872 is used in the following 1 counties:

  1. Cook, IL