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O'Fallon Area Codes

About O'Fallon Area Codes

The city of O'Fallon, located in Illinois, is served by 1 telephone area code(s) in this dataset. These calling codes connect residential neighborhoods, business districts, and surrounding communities.

Major phone area codes used in O'Fallon include 618. The city falls under the America/Chicago time zone(s), depending on the exact location and provider routing.

List of Area Codes in O'Fallon, Illinois

The table below lists all telephone area codes used in O'Fallon, Illinois, along with the associated counties and time zones from this dataset.


S.N. Area Code Counties Time Zone(s)
1 618 St. Clair America/Chicago


ZIP Codes in O'Fallon, Illinois

Zip code data is not available for this city in the current dataset.



Related Area Code Pages

Explore related area code resources on Burning Compass:

  • All area codes in Illinois
  • Individual area code details are available from the table above.

Cities in Illinois (Area Codes)

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  15. Buffalo Grove Area Codes
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  18. Carbondale Area Codes
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  20. Carpentersville Area Codes
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  22. Charleston Area Codes
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  35. East Moline Area Codes
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