Where is area code 331?
Area code 331 serves Chicago (West Suburbs), IL. It was established in 1997.
Major Cities in Area Code 331
The 331 area code covers Chicago (West Suburbs), IL. Major cities and communities include:
- Aurora
- Bolingbrook
- Elgin
- Naperville
- Oak Park
History of Area Code 331
Area code 331 was established in 1997 and serves Chicago (West Suburbs), IL.
Nearby Area Codes
Related area codes near 331:
Common 331 Scam Patterns
Government Impersonation
Scammers pretending to be from IRS, Social Security, or local authorities
Common prefixes: 800, 888, 877
- Threatening immediate arrest
- Demanding immediate payment
- Requesting gift cards or wire transfers
Auto Warranty Scams
Automated calls about extended car warranties
Common prefixes: 833, 844, 855
- Pre-recorded messages
- Urgent warranty expiration claims
- Pressure to provide vehicle information
Tech Support Fraud
Fake technical support calls claiming computer problems
Common prefixes: 866, 877, 888
- Claims of detected viruses
- Requests for remote computer access
- Microsoft/Apple impersonation
Legitimate Callers From 331
Government
Utilities
- — Service and billing notifications
Healthcare
- — Appointment reminders and follow-ups
Chicago (West Suburbs), IL Authorities & Reporting
- Police: Aurora Police Department (630-256-5500)
- Consumer protection: DuPage County Department of Consumer Protection (630-407-2100)
- Fraud unit: Naperville Police Department Fraud Unit (630-420-6666)
- Emergency: 911, Aurora Fire Department (630-256-5015), DuPage Medical Group (630-353-3211)
Immediate steps if you suspect a scam:
- Document the call details
- Report to FTC at ftc.gov/complaint
- Contact local authorities
- Alert your bank if needed
Frequently Asked Questions
Where is the 331 area code?
The 331 area code serves Chicago (West Suburbs), IL. Major cities include Aurora, Bolingbrook, Elgin, Naperville, Oak Park. It was established in 1997.
Is the 331 area code a scam?
The 331 area code itself is legitimate — it covers Chicago (West Suburbs), IL. But scammers spoof local numbers: 5,587 scams were reported in 2023, with common types including utility 34%, government 20%, banking 27%, other 26%. Always verify unknown callers.
What time zone is area code 331?
Area code 331 is in the Central Time Zone (CST).
How do I report a scam call from 331?
Report scam calls to the FTC at reportfraud.ftc.gov, the FCC, and DuPage County Department of Consumer Protection (630-407-2100). For Chicago (West Suburbs), IL, contact Naperville Police Department Fraud Unit (630-420-6666) to file a complaint.
How can I protect myself from 331 area code spam calls?
Block unknown numbers, use caller ID / spam-blocking apps, never share personal info with unsolicited callers, and verify callers through official channels. CyberForget's phone tools help check whether a number is linked to known scams.
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