Lookup › Area code 331
331 Area Code — Aurora, Illinois
Area code 331 serves Aurora, IL.
Most looked-up 331 numbers
Phone prefixes in 331
Carriers serving 331
- Onvoy, LLC (1 numbers)
Frequently asked questions
Where is area code 331?
Area code 331 serves Aurora, IL.
What prefixes are in area code 331?
Phone2.io tracks 1 phone prefixes in area code 331, with carrier and spam-report data on individual numbers.
More about area code 331
Area code 331 overview, history, and local numbers · Get a IL phone number
Last updated: September 9, 2026