St. Louis, Missouri
557 Area Code
Establish a trusted local presence in St. Louis and inner-ring suburbs with a 557 area code number. Ideal for businesses that want higher pickup rates and local trust in St. Louis City and County.
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About 557 Area Code
Area code 557 serves St. Louis and the inner-ring suburbs of St. Louis County as an overlay to the original 314 area code. Introduced on August 12, 2022 to address number exhaustion in the 314 region, 557 covers the same geographic territory including the city of St. Louis and communities such as University City, Kirkwood, Florissant, Maryland Heights, Webster Groves, Creve Coeur and Hazelwood. The code supports local voice and SMS-capable numbers used by businesses, healthcare organizations, financial institutions and government agencies across one of the Midwest's most historic urban centers.
The 557 region shares the same economic landscape as 314, anchored by healthcare (BJC HealthCare, Barnes-Jewish Hospital), financial services (Edward Jones, Wells Fargo Advisors), higher education (Washington University, Saint Louis University), manufacturing (Boeing Defense, General Motors), and logistics tied to the Port of Metropolitan St. Louis. Local businesses use 557 numbers for patient appointment reminders, investment client communication, campus services, customer support and distribution coordination. These practical applications generate higher answer rates than toll-free alternatives because they signal genuine local connections and match caller expectations.
FoneSwift lists live 557 inventory and capabilities on this page. Search numbers to see which ones support Voice, SMS and MMS. As a newer overlay code, 557 often has better availability than 314, making it ideal for businesses seeking fresh St. Louis numbers. If 557 inventory is limited, the original 314 or nearby NPAs (e.g., 636, 573) can deliver similar regional presence for Missouri-focused audiences.
If your business targets St. Louis, publish numbers in both local and E.164 formats (e.g., (557) 555-1234 and +1 557 555 1234) and register messaging traffic if you plan A2P campaigns. For porting, see our porting guide. Many businesses maintain their original numbers through porting to preserve customer recognition and brand continuity. Note that 10-digit dialing is mandatory for all calls in the 314/557 overlay region.
| Country | United States |
| State | Missouri |
| Area code | 557 |
| Primary cities | St. Louis, University City, Kirkwood, Florissant, Maryland Heights |
| Counties served | St. Louis, St. Louis City |
| Timezone | America/Chicago (CST) |
| Created | August 12, 2022 |
| International Format | +1 557 XXX XXXX |
| Local Format | (557) XXX-XXXX |
10-digit dialing is mandatory within and into the 314/557 region. Register A2P messaging for business SMS to comply with US carrier rules (10DLC).
Area code 557 uses Central Standard Time (CST, UTC-6) and observes Central Daylight Time (CDT, UTC-5) during daylight saving time from mid-March through early November.
Local numbers are commonly used for higher answer rates and local trust. As a newer overlay code, 557 often has better availability than 314. If needed, consider the 314 code or nearby NPAs like 636 or 573 for additional inventory while preserving a regional presence.
Quick Facts about 557 Area Code
Interesting tidbits about this area code 557
Newest St. Louis overlay
Area code 557 was introduced on August 12, 2022 as an overlay to 314, making it one of the newest area codes in Missouri and providing additional number capacity for St. Louis.
Same geographic footprint
Area code 557 covers the exact same territory as 314, serving St. Louis City and inner-ring suburbs. Both codes coexist in the same region without geographic boundaries between them.
Delayed overlay implementation
Plans for a 314 overlay were first announced in 2000 but postponed indefinitely. Conservation measures like number pooling delayed the need until 557 finally launched over 20 years later.
Fresh number availability
As the newer overlay code, 557 typically has better number availability than 314, making it easier for businesses to find memorable or vanity numbers in the St. Louis area.
Mandatory 10-digit dialing
All calls within the 314/557 region require 10-digit dialing (area code + number), a requirement that took effect in October 2021 before the 557 overlay launched.
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How Does Local 557 Phone Numbers Work?
A local business number is a structured telephone identifier that tells networks where to route calls and messages. When you use a 557 number in St. Louis and Missouri, the digits signal the international gateway, the geographic region, the local exchange and the specific subscriber, so calls reach the right destination quickly and reliably.
The typical parts of a United States local number are:
- Country code (+1): identifies United States for international routing.
- Area code (557): directs the call to the St. Louis / Missouri region.
- Central office / exchange (eg. 555): narrows the call to a local switching area or rate center.
- Subscriber number (eg. 1234): the unique line assigned to a person, extension, or device.
Example formats:
| International Format (E.164) | +1 557 555 1234 |
| Local Format (National) | (557) 555-1234 |
Quick Dialing Guide
The correct formats to reach 557 numbers locally and globally.
From Landlines
Standard United States FormatUse for domestic long-distance calls within United States.
From Mobile
E.164 InternationalThe universal format. Works on any mobile device, anywhere.
International
From abroadDialing from outside United States (exit code 00 varies by country).
With FoneSwift, your 557 number can be instantly configured through our intuitive dashboard. Connect it to call forwarding rules, AI voice agents, IVR menus, or route calls directly to any device. Enable voice, SMS, and MMS capabilities right from your account, no technical setup required. Your number becomes active immediately after purchase, and you can update routing, business hours, and integrations anytime.
For businesses, local numbers offer clear benefits: higher answer rates, stronger local recognition, and better performance for local campaigns and customer trust. Typical business features include call forwarding, call recording, auto-attendants, voicemail-to-email, and multi-device ringing.
Important operational notes:
- SMS & A2P: If you plan to send application-to-person messages from a 557 number, register your traffic where required and follow carrier rules (10DLC/A2P) to avoid deliverability or throughput issues.
- Number Porting: Bring your existing 557number to FoneSwift seamlessly. Our team handles the entire porting process, simply submit your number details and we'll coordinate with your current provider. Porting typically completes within 5-10 business days, and you'll receive updates at each step. There's no service interruption during the transfer.
- Display & formatting: Always publish numbers in both local and E.164 formats so international and mobile users can easily dial.
Ready to get started? Browse available 557 numbers in the phone numbers section above, you'll see real-time availability and can filter by features like voice, SMS, and MMS. Once you find your perfect number, purchase it in seconds and start making calls immediately. Our team is here to help you choose the right setup for your business needs, whether you're setting up AI receptionists, call forwarding, or SMS campaigns. Start your 14-day free trial today, no credit card required.
How to Get a 557 Phone Number
Buying a local 557 phone number using FoneSwift is easy and takes just a few minutes. Follow these simple steps to get your local 557 phone number and start connecting with customers in United States today.
Create a new account on FoneSwift or sign in to your existing account to get started.
Once logged in, you'll be taken to your FoneSwift dashboard where you can manage all your phone numbers and settings.
Click on Settings in the sidebar, then go to "My Numbers" and click the "Add a Number" button.
Choose United States as your country from the dropdown menu.
Select Local as the type of number, then choose the 557 area code from the available options.
Click the "Search" button to see all available phone numbers with the selected area code.
Browse through the available numbers, select one that fits your needs, click "Buy Number", and confirm your purchase.
Your number is now active! Start making and receiving calls from the FoneSwift Dialer immediately.
You can configure your number to handle calls, forward calls, or even create an AI voice agent to handle the calls for you.
Businesses Using 557 Phone Numbers
St. Louis and its inner suburbs support healthcare, financial services, education, manufacturing and professional services businesses. Local phone numbers are commonly used for customer-facing operations and regional campaigns.
Healthcare & medical research
Hospitals, medical centers and research institutions use local numbers for patient scheduling, telehealth, lab results and campus communications. A local area code helps with patient trust and recognition.
Financial services & investment firms
Banks, investment advisors, insurance companies and financial planning firms rely on 557 numbers for client communications, account inquiries and regional branch operations in the St. Louis financial district.
Higher education & universities
Universities like Washington University and Saint Louis University use local numbers for admissions, student services, alumni relations and campus safety to maintain strong community connections.
Manufacturing & aerospace
Boeing Defense facilities and GM assembly plants use local lines for supplier coordination, logistics scheduling, employee communications and B2B operations across the St. Louis industrial corridor.
Professional services & consulting
Law firms, accounting practices, marketing agencies and consulting businesses use 557 numbers for client intake, appointment scheduling and professional communications that signal local expertise.
Retail & hospitality
Retailers, restaurants, hotels and tourism businesses serving the Gateway Arch area and Forest Park use local numbers for reservations, customer service and local marketing campaigns.
Why Choose 557 Local Phone Number for Your Business?
Discover the advantages of having a local phone number that builds trust, increases engagement, and drives results.
Powerful Features for Your 557 Local Phone Number
Get the most out of your localphone number with FoneSwift's enterprise-grade features designed to help your business communicate more effectively.
Nearby Area Codes
Explore other area codes in the same region to expand your local presence.
Frequently Asked Questions
What cities use the 557 area code?
When was the 557 area code created?
What is the difference between 314 and 557 area codes?
Will I need to change my 314 number to 557?
Do I need to dial 10 digits for 557 numbers?
Can I get SMS-capable numbers in area code 557?
Is 557 a toll-free code?
How do I buy a 557 local phone number?
Where can I find official information about 557?
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