Receive a local area code
331
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Economic Overview
The 331 area code region is an economic powerhouse in the western suburbs of Chicago, known for its diverse industries such as manufacturing, healthcare, finance, logistics, and technology. Major employers include Navistar, Edward-Elmhurst Health, and numerous corporate offices situated in business parks throughout the area. The economy benefits from its proximity to Chicago and major transportation hubs, including O'Hare International Airport.
Geographical Overview
Area code 331 serves the western suburbs of Chicago in northeastern Illinois, primarily within DuPage County and parts of Kane and Will counties. Key cities include Naperville, Aurora, Wheaton, Downers Grove, and Elmhurst. The region features a mix of urban, suburban, and lightly wooded residential communities.
Location Info
Area code 331 is an overlay for area code 630, covering the same territory in suburban western Chicago. Its boundaries encompass the majority of DuPage County and parts of Kane, Will, and Cook counties, but exclude the city of Chicago itself. Towns covered include Glen Ellyn, Lombard, Lisle, Addison, and Oak Brook, among others.
Population Demographics
The 331 area code region is home to a diverse and well-educated population, with many families and professionals. The area has a mix of ethnic backgrounds, with growing Hispanic, Asian, and African American communities alongside a large White population. Residents generally enjoy higher-than-average household incomes compared to state and national averages.
Time Zone Info
Area code 331 is located in the Central Time Zone (CT) and observes Daylight Saving Time.
Other Area Code Details
Area code 331 was introduced in 2007 as an overlay to meet growing demand for phone numbers in the rapidly expanding suburbs of western Chicago. The region is known for its excellent school districts, vibrant downtowns like Naperville’s Riverwalk, and access to major interstates and commuter rail lines connecting to Chicago.
