331
Naperville
Central Time
Equip your phone number with Retell’s AI receptionist—trained to answer FAQs, book appointments, qualify leads, and route calls in real time. Local number, enterprise-grade service.
Suburban corporate/tech corridor: finance, insurance, IT, manufacturing.
DuPage County suburbs—Naperville, Wheaton, Aurora’s west side.
Includes Naperville, Wheaton, Lisle, Downers Grove. Retell's Chicago answering service also answers calls to 331 numbers in Chicago's western suburbs.
630 created in 1996 (split from 708); 331 overlay added in 2007.
Naperville is one of the wealthiest cities in the Midwest — boasts a top-rated public library system.
