331 Area Code Phone Directory

Information for Area Code 331

State: IL
Largest City in Area: AURORA

Where is Area Code 331?

Area code (331) is in the state of IL. Below, are the major cities in the area code (331).

Major Cities in 331

AURORA, IL (6,610)
CHICAGO, IL (4,085)
NAPERVILLE, IL (4,063)
GENEVA, IL (1,533)
BOLINGBROOK, IL (1,164)
MONTGOMERY, IL (1,106)
OSWEGO, IL (954)
LISLE, IL (924)
SAINT CHARLES, IL (867)
DOWNERS GROVE, IL (846)

Zip Codes in 331