🇺🇸 557 area code
Area code 557 covers St. Louis, Florissant, Hazelwood and Bridgeton and the surrounding area in Missouri. It shares that territory with 314, so the same neighbourhood can have numbers in any of them. Enter a 557 number below for a free check before you call back.
- Location: St. Louis, Missouri
- Time zone: Central (UTC−6)
- In service since August 12, 2022
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Validade, operadora, tipo de linha e região na primeira passagem.
Area code 557 at a glance
Cities in the 557 overlay area
- St. Louis
- Florissant
- Hazelwood
- Bridgeton
Is a 557 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 557 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 557 number to people in Missouri because a local-looking call is more likely to be answered. If a 557 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 557
557 entered service on August 12, 2022, as an overlay on 314, which had run short of numbers.
It is part of the 314/557 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 557 overlays the same ground, the cities listed are those of the codes it shares with.
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Perguntas frequentes
Area code 557 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 557?
Area code 557 is in Missouri, United States. It covers St. Louis, Florissant, Hazelwood and Bridgeton.
What time zone is area code 557?
557 is in the Central (UTC−6) time zone, and observes daylight saving time.
What area codes overlay 557?
314 serves the same area as 557. Numbers in all of them are local to one another.
When did area code 557 start?
557 entered service on August 12, 2022, created from 314.
How do I find out who called me from 557?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 557?
If you live in or near Missouri, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 557 callers who will not leave a message are best looked up before you call back.
Got a call from 557?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.