Frequently Asked Questions
Naperville, Illinois is covered by area code 331, which was implemented as an overlay for area code 630 on October 7, 2007.
Area code 331 is an overlay for 630, meaning they both serve the same geographic area. It was introduced due to increased demand for phone numbers and requires ten-digit dialing.
Several cities in DuPage County, including Addison, Bartlett, Bloomingdale, Carol Stream, Darien, Downers Grove, Elmhurst, Glen Ellyn, Glendale Heights, Lisle, Lombard, Naperville, Roselle, Villa Park, West Chicago, Westmont, Wheaton, and Woodridge, use area code 331.
Bartlett, Illinois, is covered by area code 331, which spans portions of DuPage, Cook, Kane, and Will counties.
The area code for West Chicago is 331, and it was activated on October 7, 2007, overlaying the existing 630 area code.
You should use area code 331 to call Bolingbrook, Illinois. The Illinois Commerce Commission (ICC) oversees telecommunications services in this area.
Major carriers like AT&T, Verizon, T-Mobile, and Sprint provide service in the 331 area code, offering landline, wireless, and VoIP options.
Area code 331 was created to address the increasing demand for phone numbers in Chicago's western suburbs, ensuring residents and businesses have sufficient access to telecommunications services.
Saint Charles, Illinois, uses area code 331, which is an overlay of area code 630, serving the same geographic region and requiring 10-digit dialing.
Area code 630 was created on August 3, 1996. The overlay area code 331 was introduced on October 7, 2007, to handle the rising demand for phone numbers.
You can find more information on the regulations for area code 331 on the Illinois Commerce Commission (ICC) and the North American Numbering Plan Administration (NANPA) websites.
Chicago's western suburbs primarily use area code 331. This area code is an overlay to the existing 630 area code and was implemented in 2007 to accommodate the increasing demand for phone numbers in DuPage, Cook, Kane, and Will counties.
Area code 331 was activated on October 7, 2007. It serves as an overlay to area code 630, which was itself created in 1996 from a split of area code 708. This overlay was necessary to meet the growing demand for phone numbers in the region.
Ten-digit dialing is required for all calls within area codes 331 and 630. This means you must dial both the area code and the seven-digit phone number, even for local calls.
Chicago's multiple area codes, such as 331 and 630, are due to population growth. As the demand for phone numbers increases, new area codes (like 331) are added as overlays to existing ones (like 630) to ensure sufficient numbering resources are available.
Area code 331 covers many cities in Chicago's western suburbs including Addison, North Aurora, Bartlett, Batavia, Bensenville, Bloomingdale, Bolingbrook, and many others. This area code encompasses parts of DuPage, Cook, Kane, and Will counties.
Area code 331 is regulated by the Illinois Commerce Commission (ICC). The ICC oversees telecommunications services within Illinois, ensuring compliance with state regulations.
The North American Numbering Plan Administration (NANPA) manages numbering resources for the North American Numbering Plan, ensuring compliance with national guidelines and managing area code assignments.
Major telecom carriers such as AT&T, Verizon, T-Mobile, and Sprint provide service within area code 331. These carriers offer various services, including landline, wireless, and VoIP options.
Porting your number to area code 331 is typically possible, depending on available numbers and carrier policies. Contact your desired telecom provider to inquire about porting options and procedures.
An area code overlay, like 331 over 630, is a new area code introduced within the same geographic region as an existing one. It serves to provide additional phone numbers without requiring existing numbers to change and uses ten-digit dialing.
You should always use 1 before dialing a 331 number if you're calling from outside the 331 or 630 area codes. If you are within the 331/630 overlay area, you must use 1 plus the area code plus the number. Ten-digit dialing is mandatory within the 331/630 area.
For further information about Illinois area codes, visit the websites of the Illinois Commerce Commission (ICC) or the North American Numbering Plan Administration (NANPA). These resources offer detailed information on area code assignments, regulations, and telecom services.
Area Code 331: Cities, Coverage, and Telecom Insights
Area Code 331 is an essential part of the telecommunications infrastructure in Chicago's western suburbs. Serving parts of DuPage, Cook, Kane, and Will counties in Illinois, this area code supports a growing population and is vital for both residential and business communications.
What Is Area Code 331?
Area Code 331 is an overlay for the existing 630 area code, introduced to meet the increasing demand for phone numbers in the region. Implemented on October 7, 2007, it ensures that residents and businesses in Chicago's western suburbs continue to have access to necessary telecommunications services.
Geographic Coverage of Area Code 331
Area Code 331 covers a wide range of cities in Chicago's western suburbs. Here are some of the major cities included in this area code:
Telecom Services and Carriers
Area Code 331 is supported by major telecommunications carriers, offering a variety of services:
These carriers provide both landline and wireless services, including Voice over Internet Protocol (VoIP) options, to ensure comprehensive coverage and connectivity.
Regulatory Information
Area Code 331 is regulated by the Illinois Commerce Commission (ICC), which oversees telecommunications services within the state. The North American Numbering Plan Administration (NANPA) also plays a critical role in managing numbering resources, ensuring compliance with national guidelines.
Historical Context
Conclusion
Area Code 331 is a vital component of the telecommunications framework in Chicago's western suburbs. It supports a diverse range of services and meets the region's growing demand for phone numbers. For more information on area codes and telecommunications regulations, visit the North American Numbering Plan Administration (NANPA).
Explore more about area codes in Illinois by checking out related articles on our site. For specific queries or assistance, contact your local telecom provider.