331 Area Code

The 331 area code is a telephone area code in the North American Numbering Plan (NANP) that serves the western suburbs of Chicago, Illinois, USA. It was created in 2007 as an overlay to the existing 630 area code to meet the growing demand for phone numbers in the region. The 331 area code ensures continued telephone service for both residential and business users.

Understanding the 331 Area Code

The 331 area code covers the same geographic region as the 630 area code. This includes many communities in the western Chicago metropolitan area, such as Naperville, Aurora, Wheaton, Elmhurst, and Downers Grove. It supports landline, mobile, and VoIP services.

331 Area Code Map and Geographic Location

The 331 area code map highlights the western suburbs of Chicago, Illinois, including portions of DuPage, Kane, Will, and Kendall counties.

Major Cities and Communities in the 331 Area Code

  • Naperville
  • Aurora
  • Wheaton
  • Downers Grove
  • Elmhurst
  • Lombard
  • Batavia
  • St. Charles
  • Bolingbrook

ZIP Codes within the 331 Telephone Zone (Examples)

  • 60540 - Naperville, IL
  • 60505 - Aurora, IL
  • 60187 - Wheaton, IL
  • 60126 - Elmhurst, IL
  • 60515 - Downers Grove, IL
  • 60148 - Lombard, IL
  • 60510 - Batavia, IL

Time Zone

The 331 area code follows the Central Time Zone (CT), observing Central Standard Time (CST, UTC-6) and Central Daylight Time (CDT, UTC-5) during daylight saving time.

Dialing, Phone & Service Details

  • Local dialing: 10-digit dialing is mandatory due to the overlay.
  • Long-distance calls within the USA: Dial 1 + 331 + 7-digit number.
  • International calls: Dial your country�s exit code + 1 + 331 + 7-digit number.
  • Services: Available for landlines, mobile phones, and VoIP.

What area code is 331? / Where�s area code 331?

What area code is 331? � The 331 area code is an Illinois overlay code for the western suburbs of Chicago, serving the same region as 630.

Where�s area code 331? � The 331 area code is located in the state of Illinois, USA, covering cities like Naperville, Aurora, Wheaton, and Downers Grove.

Frequently Asked Questions (FAQ) about 331 Area Code

What is the 331 area code?

The 331 area code is an overlay to 630, serving the western suburbs of Chicago, Illinois.

When was the 331 area code created?

The 331 area code was created in 2007 as an overlay to 630.

Where is area code 331 located?

It is located in northeastern Illinois, covering the western Chicago suburbs.

What time zone is 331 in?

The 331 area code follows Central Time (CST/CDT).

Does 331 have an overlay?

Yes. The 331 area code overlays the 630 area code.

Is 331 only for Illinois?

Yes, the 331 area code is exclusively used in Illinois, USA.

331 Area Code