What is the 331 Area Code?
Chicago (West Suburbs), IL
Safety Rating: MODERATE
The 331 area code serves Chicago (West Suburbs), IL and surrounding areas. Established in 1997, it covers Aurora, Bolingbrook, Elgin, Naperville, Oak Park.
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Legitimate Callers from 331
Government
Utilities
Service and billing notifications
Healthcare
Appointment reminders and follow-ups
Timezone
Central Time Zone (CST)
Risk Level
6.3/10
2023 Scams
5587
Population
Approximately 2.5 million
Regional Information
Major Cities
- Aurora
- Bolingbrook
- Elgin
- Naperville
- Oak Park
Major Employers
- Rush Copley Medical Center
- Edward-Elmhurst Health
- AbbVie
- Northwestern Medicine
- Amazon
Local Authorities
- 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)
Active Scam Alerts
No active scam alerts at this time.
Safety Resources
How to Report Scams
Immediate Steps:
- Document the call details
- Report to FTC at ftc.gov/complaint
- Contact local authorities
- Alert your bank if needed
Follow-up Actions:
- File written complaint
- Monitor credit reports
- Join Do Not Call Registry
- Share alert with community