Area Code 331

Where Is Area Code 331?

Updated: May 22nd 2017

The 331 area code is used for Naperville as well as its neighbor Aurora. As a fairly recent area code, it was implemented as an overlay to the 630 area code in 2007. Currently, the 331 area code is mainly preserved for small suburbs of western Chicago, including a few neighborhoods in the Cook and Dupage Counties.

The Naperville area code is fairly wealthy with a median family income of $130,000. Furthermore, only 2.5% of the population in the 331 area code lives below the poverty line. The economy is flourishing in Naperville due to the headquarters of several affluent corporations. For instance, OfficeMax has their corporate headquarters in Naperville and Kraft Foods recently opened up a plant in area code 331 as well. Most people in area code 331 work at Edward Hospital, which is known for its leading cardiac care specialists. With all of the disposable income floating around in Naperville, auto dealerships have also popped up all over the place in recent years. Area code 331 is home to more than 10 automobile dealerships and even a public-private automobile test track.

Aurora, Illinois is a much bigger city than the nearby city of Naperville. With more than 200,000 people, the Aurora portion of the 331 area code is the second most populous in Illinois. The city is known for its huge architecture. In fact, structures by respected architects such as Frank Lloyd Wright, Bruce Goff, and Ludwig Mies van der Rohe are scattered throughout the Aurora area code. Nevertheless,

Aurora is most known by statisticians as the fastest growing city in the United States. Most of the newer Aurora residents are of Hispanic descent, and compose almost 50% of the Aurora population.

This area has a history that is filled with entertainment, including several historical theaters. For instance, the Paramount Theatre was built with Venetian elements in the early 1930s. It still survives today and has undergone several renovations. Other theaters in area code 331 were not as lucky and were ultimately demolished. Nevertheless, these theaters, which include the New Fox Theater, Isle Theater, Tivolli Theater, and Star Theater still contributes to Aurora’s rich history in entertainment.

Major Cities In Area Code 331



The most popular attraction in area code 331 is undoubtedly the Phillips Park Zoo. It is almost 100 years old and does not charge locals any admission to view its exotic animal exhibits. Focusing on animals that are native to the United States, the Phillips Park Zoo’s exhibits include river otters, gray wolves, pygmy goats, ducks, swans, and various reptiles. Although the zoo is not necessarily the biggest or best in the United States, it does hold true to its original values and offers residents of area code 331 a delightful afternoon that is especially popular with younger children. The cougar and turkey exhibits are particularly entertaining and provide education about the creatures featured. As a result, it is often used as a fieldtrip for local schools.

Illinois Area Codes By Number