Area Code 557 Phone Number
for Your Business
Get a local 557 number for your business in St. Louis, MO. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 557?
Area code 557 is a North American telephone area code serving St. Louis, Missouri. It has been in service since August 12, 2022 and operates on Central Time. It is part of the 314/557 overlay complex. Businesses operating in the 557 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 557 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 557 at a Glance
- Region
- St. Louis (overlay), Missouri
- In service
- Since August 12, 2022
- Time zone
- Central Time
- Overlay
- Shares its territory with 314; local calls use 10-digit dialing
- History
- Added on August 12, 2022 as an overlay of 314
- 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 557 Local Number
A local number tells customers you're part of the community. People in St. Louis are more likely to pick up a call from a 557 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 557 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 557
What cities use area code 557?
Area code 557 serves the St. Louis (overlay) area of Missouri. Cities in the 557 region include St. Louis, MO.
Is area code 557 an overlay?
Yes. 557 is part of the 314/557 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 557 in?
Area code 557 is in Central Time. Telemarketing calls to residential 557 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 557 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 557 area code number regardless of where your business is physically located. This lets you establish a local presence in St. Louis without a physical office.
Can I keep my existing 557 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 557 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 557 local number is included in the plan.
Get Your 557 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.