331 Area Code Information
State: IL
Largest City in Area: AURORA
Where is Area Code 331? Area code (331) is in the state of IL. The PeopleSearchNow database has 22,234 records on file with a phone number in the area code of (331). 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
- 60134
- 60139
- 60148
- 60174
- 60185
- 60188
- 60440
- 60504
- 60505
- 60506
- 60510
- 60517
- 60532
- 60538
- 60540
- 60542
- 60543
- 60563
- 60564
- 60565