About Area Code 331
Area code 331 serves Illinois, covering major cities including Aurora, Naperville. Operating in the Central Time (CT), this code was established in 2007.
| State | Time Zone | Cities |
|---|---|---|
| Illinois | Central Time (CT) | Aurora, Naperville |
Active Area Code
331
Illinois
Central Time (CT)
Est. 2007
PRIMARY
Location
Illinois
Aurora
ACTIVE
Coverage
2 Cities
Since 2007
Beware of Spam Calls
Scammers frequently use 331 numbers. Always verify unknown callers before sharing personal information.
Protect Yourself NowCommon Questions
Where is 331?
Located in Illinois, serving Aurora and surrounding areas.
What time zone?
Operates in Central Time (CT).
When established?
Area code 331 was introduced in 2007.
Used for spam?
Can be used by legitimate and fraudulent callers. Always verify unknown numbers.