Area Code 331 Illinois, USA

WhereCall is here to provide you with the most information on the area code 331, located in Illinois, USA. This area code contains 108 prefixes and is not in jeopardy of exceeding the known supply of central office codes during the planning/implementation interval for relief.

NPA Information
Area Code (NPA) 331
Location Illinois, USA
In Jeopardy? No
Is Assigned? Yes
Assignment Date 23 Jul 1999
In Service? Yes
In Service Date 07 Oct 2007
Parent NPA 630
Overlay Yes
Overlay Complex 331/630
Predominant Timezone(s) UTC-06:00
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