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St. Clair County Area Codes

About St. Clair County Area Codes

The county of St. Clair County, located in Illinois, is served by 1 telephone area code(s) in this dataset. These calling codes cover cities, suburbs, and unincorporated communities across the county.

Major phone area codes used in St. Clair County include 618. The county mainly follows the America/Chicago time zone.

Cities and towns served by these area codes in St. Clair County include Belleville, East Saint Louis, O'Fallon.

List of Area Codes in St. Clair County, Illinois

The table below lists all telephone area codes used in St. Clair County, Illinois, along with their associated cities and time zones from this dataset.


S.N. Area Code Cities Time Zone(s)
1 618 Belleville, East Saint Louis, O'Fallon America/Chicago


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.

County Area Codes in Illinois

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