331 area code
Area code 331 is in Illinois, including Aurora, Naperville, Elmhurst and Bensenville. It's on Central Time.
331 is an overlay area code: it was added on top of 630 and covers the same area, so new numbers there can get either code.
Central Time
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Is it a good time to call 331?
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Business hours are taken as 9 AM to 5 PM on weekdays. US telemarketing rules only allow sales calls between 8 AM and 9 PM local time.
Cities in area code 331
| City | Time zone |
|---|---|
| Aurora, IL | Central Time |
| Naperville, IL | Central Time |
| Elmhurst, IL | Central Time |
| Bensenville, IL | Central Time |
| Oak Brook, IL | Central Time |
| Bolingbrook, IL | Central Time |
| Wheaton, IL | Central Time |
| St. Charles, IL | Central Time |
| Downers Grove, IL | Central Time |
| Lombard, IL | Central Time |
| Glen Ellyn, IL | Central Time |
| Geneva, IL | Central Time |
Other area codes in Illinois
More: look up another area code · time zone converter · US time zones map
Questions people ask
Where is area code 331?
Area code 331 is in Illinois, including Aurora, Naperville, Elmhurst and Bensenville.
What time zone is area code 331?
331 is on Central Time (UTC−6, UTC−5 in summer).
What time is it in area code 331 right now?
The live clock at the top of this page shows the current local time in area code 331.