Missouri St. LouisGeographic

Area Code 557

St. Louis, Missouri

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21,408

Available Numbers

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Cities Covered

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Chicago

Timezone

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10-digit

Dialing Rules

Coverage Area

557 Cities and regions covered

Missouri · MO

Major Cities

St. Louis Florissant Chesterfield Ballwin Kirkwood Webster Groves Maryland Heights Creve Coeur Wildwood Hazelwood

In Service 2024-01-01

Status Active

Area Code History

557

557区号于2024年作为314区号的叠加区号引入，覆盖密苏里州圣路易斯市及周边地区。

Dialing Rules

557

10-digit

When dialing 557 area code numbers, follow these rules:

Local calls require full 10-digit dialing (area code + 7-digit number)
Long-distance calls require 1 + area code + 7-digit number

Why 557 is Valuable for Business

557 · St. Louis

The 557 area code covers St. Louis and surrounding areas, making it one of the most commercially valuable area codes in Missouri. Owning a premium 557 number enhances your business image and customer trust.

Premium Numbers

557 Premium numbers in this area code

FAQ

557 FAQ

What state is the 557 area code in?

The 557 area code is in Missouri (MO), primarily covering St. Louis and surrounding areas.

How do I get a premium 557 area code number?

You can search and buy premium 557 numbers on GreatNumber. We offer one-time payment with lifetime ownership — no monthly fees or hidden charges. We provide full porting assistance after purchase.

Can I port a 557 number to another carrier?

Yes, all numbers purchased on GreatNumber can be ported to any carrier of your choice (T-Mobile, AT&T, Verizon, etc.). Porting typically takes 3-14 business days, and we provide full bilingual support.

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Area Code 557

557 Cities and regions covered

Major Cities

557

557

557 · St. Louis

557 Premium numbers in this area code

557 FAQ

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