Area Code 331: DuPage County / Aurora Overlay

Area code 331 is in DuPage County / Aurora Overlay, Illinois. Numbers that start with 331 are based in Aurora, Naperville, Wheaton.

Area code 331 covers DuPage County / Aurora Overlay in Illinois. The primary cities served include Aurora, Naperville, Wheaton.

Area code 331 is primarily associated with Aurora, along with Naperville, Wheaton. It serves the broader DuPage County / Aurora Overlay area.

Area code 331 is in Illinois (IL). Illinois has 15 area codes in total.

Area code 331 operates in the Central Time Zone. Keep this in mind when scheduling calls with contacts in the DuPage County / Aurora Overlay area.

Yes, area code 331 is an overlay of area code 630. Both codes serve the same geographic area, DuPage County / Aurora Overlay, and were introduced to meet growing demand for phone numbers. Because 331 is an overlay, 10-digit dialing is required for all local calls within the region.

Yes. Because 331 is an overlay sharing its territory with area code 630, 10-digit dialing, the full area code plus the 7-digit number, is required for all local calls within DuPage County / Aurora Overlay.

No, area code 331 is a local geographic area code, not a toll-free number. Standard call charges apply based on your carrier plan. Toll-free area codes include 800, 833, 844, 855, 866, 877, and 888.

Businesses can get a local 331 phone number through Convirza's call tracking platform. A 331 number lets you track inbound calls from DuPage County / Aurora Overlay, measure marketing ROI, and analyze conversation data to improve sales performance. Get started with $20 in credits, no credit card required.