Area Code 312 Phone Number
for Your Business
Get a local 312 number for your business in Chicago, IL. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 312?
Area code 312 is a North American telephone area code serving Chicago, Illinois. It is one of the original 1947 North American area codes and operates on Central Time. It is part of the 312/872 overlay complex. Businesses operating in the 312 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 312 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 312 at a Glance
- Region
- Chicago (Downtown), Illinois
- In service
- One of the original 1947 North American area codes
- Time zone
- Central Time
- Overlay
- Shares its territory with 872; local calls use 10-digit dialing
- 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 312 Local Number
A local number tells customers you're part of the community. People in Chicago are more likely to pick up a call from a 312 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 312 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 312
What cities use area code 312?
Area code 312 serves the Chicago (Downtown) area of Illinois. Cities in the 312 region include Chicago, IL.
Is area code 312 an overlay?
Yes. 312 is part of the 312/872 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 312 in?
Area code 312 is in Central Time. Telemarketing calls to residential 312 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 312 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 312 area code number regardless of where your business is physically located. This lets you establish a local presence in Chicago without a physical office.
Can I keep my existing 312 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 312 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 312 local number is included in the plan.
Get Your 312 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.