The 331 area code is a calling code assigned to the western suburbs of Chicago, Illinois. It was created in 1997 to overlay the existing 708 area code, which had become exhausted due to the rapid growth of the region. Today, the 331 area code serves over 1 million people in communities such as Aurora, Naperville, and Elgin.
Before the introduction of the 331 area code, the western suburbs of Chicago were served by the 708 area code. However, by the mid-1990s, the 708 area code was reaching its capacity. To accommodate the growing demand for telephone numbers, the Illinois Commerce Commission (ICC) authorized the creation of an overlay area code, which would be assigned to the same geographic region as the existing area code.
The 331 area code encompasses a large portion of the western suburbs of Chicago, including the following counties:
County | Major Cities |
---|---|
DuPage County | Aurora, Naperville, Lombard, Downers Grove |
Kane County | Elgin, St. Charles, Batavia, Geneva |
Kendall County | Yorkville, Oswego, Plano, Sandwich |
Will County | Bolingbrook, Joliet, Romeoville, Plainfield |
According to the U.S. Census Bureau, the population of the 331 area code was estimated to be 1,032,195 in 2020. The area code is primarily residential, with a mix of single-family homes, apartments, and condominiums. It is also home to several major businesses and corporations, including AbbVie, Edward-Elmhurst Health, and Nicor Gas.
When dialing a phone number within the 331 area code, it is important to avoid common mistakes:
The 331 area code plays a vital role in the communication infrastructure of the western suburbs of Chicago. It provides:
Using the 331 area code offers several benefits:
The 331 area code is one of several area codes that serve the Chicago metropolitan area. The following table compares the 331 area code to other area codes in the region:
Area Code | Counties Served | Major Cities |
---|---|---|
312 | Cook County | Chicago |
708 | Cook County, DuPage County | Chicago suburbs, Oak Lawn, Cicero |
331 | DuPage County, Kane County, Kendall County, Will County | Aurora, Naperville, Elgin, Joliet |
847 | Lake County, McHenry County | Evanston, Schaumburg, Libertyville |
If you live or work in the western suburbs of Chicago, make sure to familiarize yourself with the 331 area code. Use it when dialing local numbers and ensure that you provide it when giving out your phone number. By using the 331 area code correctly, you can enjoy the benefits of local access, portability, and enhanced competition.
Year | Number of Lines | Population |
---|---|---|
2000 | 450,000 | 850,000 |
2010 | 700,000 | 950,000 |
2020 | 1,000,000 | 1,032,195 |
Company | Industry | Location |
---|---|---|
AbbVie | Pharmaceuticals | North Chicago |
Edward-Elmhurst Health | Healthcare | Naperville |
Nicor Gas | Utilities | Naperville |
Exelon | Energy | Lisle |
Caterpillar | Construction equipment | Aurora |
County | Population Density (per square mile) |
---|---|
DuPage County | 1,500 |
Kane County | 900 |
Kendall County | 500 |
Will County | 700 |
The information provided in this article is based on publicly available sources and is believed to be accurate. However, the author makes no representations or warranties as to the accuracy or completeness of the information provided. The author shall not be held liable for any errors or omissions in the information provided.
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