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AREA CODE · MISSOURI

Area code 557

Area code 557 covers St Louis, Missouri. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Missouri Major City: St Louis Central Time (CT) Overlay: 314/557
01 / WHERE IT IS

Where is area code 557?

Area code 557 is assigned to St Louis and the surrounding region in Missouri. Calls to numbers that start with 557 are routed to this area.

Area code 557 shares its territory with 314. Because it is an overlay, local calls require dialing all 10 digits.

Counties covered

St. Louis CountySt. Louis city

Line types

  • Mobile 42.65%
  • Landline 57.35%
02 / MAP

Area code 557 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in St Louis

This area code is in the Central Time (CT) time zone.

Local timeSt Louis, MO--:--:--

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America/ChicagoLive
04 / HOW TO DIAL

How to call St Louis

WITHIN THE US557 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 557 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 557 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 557 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 557 555 0123
🇦🇺Australia0011 1 557 555 0123
🇯🇵Japan010 1 557 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 557

Share of the number blocks by carrier and line type.

Landline

AT&T
44%
Sinch
31%
Five9
5%
Terra Nova Telecom
5%
Comcast
3%
Others
13%

Mobile

AT&T Mobility
59%
Verizon Wireless
21%
Sinch
10%
T-MOBILE USA
7%
Boost Mobile
3%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 557

68 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(557) 200 Landline Ladue SinchONVOY, LLC - MO
(557) 201 Landline Kirkwood AT&TTELEPORT COMMUNICATIONS AMERICA, LLC - MO
(557) 202 Landline St Louis ComcastCOMCAST IP PHONE, LLC
(557) 203 Mobile Mehlville T-MOBILE USAT-MOBILE USA, INC.
(557) 204 Landline St Louis Five9FIVE9, INC.
(557) 205 Landline St Louis AT&TTELEPORT COMMUNICATIONS AMERICA, LLC - MO
(557) 206 Landline St Louis AT&TTELEPORT COMMUNICATIONS AMERICA, LLC - MO
(557) 207 Landline Oakville Five9FIVE9, INC.
(557) 208 Landline Ladue SinchONVOY, LLC - MO
(557) 209 Landline Kirkwood SinchONVOY, LLC - MO

Showing 10 of 68 prefixes

07 / FAQ

Frequently asked questions about area code 557

Where is area code 557 used?
Area code 557 serves St Louis and the surrounding area in Missouri, including St. Louis County, St. Louis city.
What city is area code 557 from?
The main city of area code 557 is St Louis, MO.
What time zone is area code 557 in?
Area code 557 is in the Central Time (CT) time zone (America/Chicago).
Is 557 an overlay area code?
Yes. It shares its territory with 314. In an overlay, every call requires dialing all 10 digits.
How do I call a number with area code 557 from the United States?
Dial the 10 digits: 557 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 557 number from another country?
Dial your country's exit code (or +), then 1, then 557 and the seven-digit number. From a mobile you can use +1 557 XXX XXXX.
Which carriers use area code 557?
Most landline blocks belong to AT&T and most mobile blocks to AT&T Mobility. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 557 for landlines, mobiles or both?
Both. About 57.35% of the number blocks are landline, 42.65% mobile.
How do I save a 557 number in WhatsApp or my phone?
Save it in international format: +1 557 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 557?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

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Other area codes in Missouri

235 · Birch Tree314 · St Louis417 · Springfield573 · Columbia636 · St Charles660 · Sedalia816 · Kansas City975 · Kansas City

View all Missouri area codes →