Area Code 331 Phone Number
for Your Business
Get a local 331 number for your business in Naperville, IL. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 331?
Area code 331 is a North American telephone area code serving Naperville, Illinois. It has been in service since October 7, 2007 and operates on Central Time. It is part of the 331/630 overlay complex. Businesses operating in the 331 area code region use local numbers to build trust with customers, improve answer rates, and establish a professional local presence.
With Zonitel, you can get a new 331 area code number or port your existing one with guided onboarding — no hardware required. Your team can make and receive calls from any device using the Zonitel mobile app or web portal.
Area Code 331 at a Glance
- Region
- Aurora / Naperville (overlay), Illinois
- In service
- Since October 7, 2007
- Time zone
- Central Time
- Overlay
- Shares its territory with 630; local calls use 10-digit dialing
- History
- Added on October 7, 2007 as an overlay of 630
- Telemarketing hours
- 8 a.m.–9 p.m. Central Time for residential numbers (TCPA, 47 CFR 64.1200(c)(1))
Why Your Business Needs a 331 Local Number
A local number tells customers you're part of the community. People in Naperville are more likely to pick up a call from a 331 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 331 Number
Zonitel is not just a phone number — it's a complete cloud business phone system. Every plan includes:
Frequently Asked Questions About Area Code 331
What cities use area code 331?
Area code 331 serves the Aurora / Naperville (overlay) area of Illinois. Cities in the 331 region include Naperville, IL.
Is area code 331 an overlay?
Yes. 331 is part of the 331/630 overlay, so new numbers in this region can come from any of those area codes, and local calls require 10-digit dialing.
What time zone is area code 331 in?
Area code 331 is in Central Time. Telemarketing calls to residential 331 numbers are limited to 8 a.m.–9 p.m. Central Time under the TCPA (47 CFR 64.1200(c)(1)).
Can I get a 331 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 331 area code number regardless of where your business is physically located. This lets you establish a local presence in Naperville without a physical office.
Can I keep my existing 331 number and switch to Zonitel?
Yes. Number porting is free. Porting commonly takes 5–10 business days depending on your current carrier, and your old service stays active until the coordinated cutover.
How much does a 331 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 331 local number is included in the plan.
Get Your 331 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.