Area Code 331

Country United States
State/Province Illinois 
Major City Aurora 
Easy URL 

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331 Area Code is an area code finder with detailed information on the 331 area code including 331 area code map.

Major cities like Aurora within area code 331 are also listed on this page. More area codes, including those outside of Illinois, are found on the homepage.

Some telephone area codes are overlaid, requiring 10-digit dialing. is your one-stop site for area code lookup, area code search, and area code locator.

Area Code 331 Detail

Area code 331, overlain with 630, serves portions of Chicago’s near and far western suburbs. 10-digit dialing is required in these areas.

331 Area Code Location
Major Cities County State/Province
Aurora  Kane  IL 
Naperville  DuPage  IL 
Wheaton  DuPage  IL 
Other Cities By Name
Downers Grove  DuPage  IL 
Elmhurst  DuPage  IL 
Geneva  Kane  IL 
Lombard  DuPage  IL 
Oswego  Kendall  IL 
Roselle  DuPage  IL 
St. Charles  Kane  IL 

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