557 Area Code: St. Louis, Missouri
The 557 area code covers St. Louis, Missouri. It is a geographic North American Numbering Plan code, so a number beginning 557 was originally assigned in that area. Caller ID can be spoofed and mobile numbers move with their owner, so a 557 number does not prove the caller is there now.
HOW A 557 NUMBER IS BUILT
557 is the area code. The next three digits are the exchange, and the last four are the line.
WHERE 557 SITS
One dot per US area code. 557 is highlighted, at the approximate centre of its calling area rather than on its border.
| Area code | 557 |
|---|---|
| Type | Geographic |
| State | Missouri |
| Largest city | St. Louis |
| Country | United States (NANP) |
Who called you from a 557 number?
Enter the full 10-digit number to see who it is listed to, where it is registered, and whether it is a mobile, landline or VoIP line.
Is a 557 number a scam?
557 is a real area code for Missouri, so seeing it is not itself a warning sign. What matters is that scam callers deliberately spoof local-looking numbers, because people answer a familiar area code far more often than an unfamiliar one.
The reliable signals are in the call, not the code. Be suspicious of anyone who creates urgency, asks for payment in gift cards, crypto or a wire transfer, requests a code that was just texted to you, or claims to be from an agency you have not contacted. No real bank or government office does any of those things.
If a caller claims to be an organisation you deal with, hang up and call the number on your card or their official site. If you were sent a message rather than called, paste it into our free scam checker, or run the number through the spam number lookup.
Frequently asked questions
Where is area code 557?
Area code 557 serves St. Louis, Missouri. It is part of the North American Numbering Plan, which covers the US, Canada and 18 other territories.
Is area code 557 a scam?
557 is a legitimate geographic area code for Missouri, so the code itself is not a warning sign. Scam callers do spoof local-looking numbers on purpose, because people answer familiar codes more often. Judge the call by what the caller asks for, and look the number up before calling back.
Who called me from a 557 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, the registration city and state, and whether the line is a mobile, a landline or a VoIP number.
Is 557 a mobile or landline area code?
Both. US area codes are geographic, not device-specific, so 557 covers mobiles, landlines and VoIP lines alike. To find out which a specific number is, run it through the lookup above.
Should I answer calls from area code 557?
If you have no connection to Missouri, treat an unexpected call as you would any unknown number. Let it go to voicemail, and if it matters the caller will leave a message. Calling back confirms your line is live, which is exactly what robocallers test for.
Area code assignments come from the North American Numbering Plan Administrator's published NPA and city reports. Area codes cover wide regions and are periodically split or overlaid, and the city shown is the largest in the calling area rather than the only one. Caller ID can be spoofed, and mobile numbers keep their original area code when their owner moves, so an area code is an indication of where a number was assigned, not proof of where a caller is.