State
Illinois
Major City
Aurora
Time Zone
America/Chicago
Current Time
8:37 AM
331 Area Code
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Area Code info
Where is Area Code 331?
The 331 area code is located in the state of Illinois . 331 is one of the 357 three-digit telephone area codes in the USA. It covers roughly 28,770 unique phone numbers and 12,582,032 individuals near the cities of Aurora, Addison, Bartlett in our database.
Cities in the 331 Area Code
The most populous cities in area code 331 are
Aurora
182.3kNaperville
148.5kBolingbrook
75.4kWheaton
53.8k Other cities in area code 331 include
Downers Grove
Elmhurst
Lombard
Bartlett
Hanover Park
Oswego
Woodridge
Saint Charles
Glen Ellyn
West Chicago
Homer Glen
Roselle
Geneva
Yorkville
Montgomery
Bensenville
Lemont
Hinsdale
Warrenville
Plano
331 Area Code Time Zone
This time zone is known as the Central Standard Time (CST). The current time in this time zone is 8:37 AM on Jul 10, 2025.
In Service Date: Oct 7, 2007
331 Area Code Demographics
Statistics based on US Census data for the 331 area code
39.1
Median Age
$76.7k
Median Income
$251.6k
Median Home Value
12.6M
Total People
Nearby Area Codes
Phone Numbers
1,171,460
State
Illinois
Major City
Springfield
Phone Numbers
263,428
State
Illinois
Major City
Elgin
Phone Numbers
972,896
State
Illinois
Major City
Peoria
Phone Numbers
1,052,188
State
Illinois
Major City
Chicago
Phone Numbers
1,004
State
Illinois
Major City
Phone Numbers
1,627
State
Illinois
Major City
Phone Numbers
1,273,610
State
Illinois
Major City
Belleville
Phone Numbers
1,842,716
State
Illinois
Major City
Aurora
Reverse Phone Lookup 331-XXX-XXXX
Find out who the 331 phone number is registered under. Our free reverse phone lookup allows you to search records associated with a landline or cell phone number to help quickly identify who’s calling or texting you.
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Browse Phone Number Prefixes in the 331 Area Code
Landlines
116Wireless Prefixes
8Carriers
24Countries
5ZIP Codes
69