Area Code 331 Map and Data

Area Code 331 Profile

Start Date	10/07/2007
Current Time in Area Code 331	331> CDT
Timezone	Central Daylight Time
Regional Market Area	Metro Chicago
Population (2020)	1581268
Adjacent Area Codes	224,464,630,708,773,779,815,847,872
Overlay Area Codes	630

Area Code 331 Boundary Map

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List of ZIP Codes in Area Code 331

List of Counties in Area Code 331

DuPage County
Kane County
Kendall County

List of Major Cities/Towns in Area Code 331

Addison
Aurora
Bolingbrook
Carol Stream
Downers Grove
Elmhurst
Glendale Heights
Lombard
Naperville
Oswego
St. Charles
Wheaton
Woodridge

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