557 Area Code
Covers St. Louis and nearby communities in Missouri.
(557) 555-0142Area code 557 map
Interactive coverage map for area code 557, centered on St. Louis, Missouri
38.6273, -90.1979
Open in OpenStreetMapArea code 557 coverage map — centered on St. Louis. Shaded area shows the approximate reach around the primary city.
557 is the area code for St. Louis and the surrounding part of Missouri. It reaches roughly 371,000 people across places such as St. Louis, Florissant, Affton, Ferguson and more. The region observes Central time, so a number like (557) 555-0142 is on that clock right now. On the ground it spans Saint Louis. It shares its territory with the overlay code 314, which sit on the exact same map. Because the 557 region uses more than one area code, you must dial all ten digits — area code included — even for a local call. You do not, however, need to dial a leading 1 for calls within the US and Canada. Scroll on for a real-time clock, an area map, the cities and counties inside 557, its related area codes, and practical advice on 557 robocalls and caller-ID spoofing.
Cities covered by 557
Cities & neighborhoods
- St. Louis
- Florissant
- Affton
- Ferguson
- Hazelwood
- Kirkwood
- Maryland Heights
- Mehlville
- Oakville
- Spanish Lake
- University City
- Webster Groves
Nearby & overlay area codes
Overlay codes (same area)
These share 557’s geography — a number in either code can be on the same street.
Neighboring codes
Codes for adjacent regions and metros.
Is a call from 557 a scam?
Area code 557 serves St. Louis and the surrounding area, so most calls are ordinary local and business traffic. As everywhere, spam and robocalls do use 557 numbers, frequently by spoofing a local-looking caller ID to boost pickup rates. The area code itself tells you nothing about who is really calling, so judge the call by what's said, not the number.
Red flags to watch for
- Pressure to act right now, or threats of arrest, fines, or service being cut off.
- Requests to pay with gift cards, wire transfer, crypto, or a payment app.
- Asking for passwords, one-time codes, your SSN, or full card/bank numbers.
- A robocall or recording, or a number that won’t let you call back.
When unsure, hang up and call the organization back on a number you look up yourself.
Calling a 557 number from abroad
Every 557 number is a US/Canada +1 number. From a mobile anywhere, the simplest approach is to dial it in international format:
+1 557 555-0142If your phone can’t dial the +, replace it with your country’s exit code, then 1, then the number:
- UK, Germany, France & most of Europe
00 1 557 555-0142 - Australia
0011 1 557 555-0142 - Japan
010 1 557 555-0142 - Mexico
00 1 557 555-0142
Within the US and Canada you don’t need any of this — just dial the ten digits 557 555-0142.
Reverse phone lookup
Check any US or Canada number to see whether it's a working line, which carrier it sits on, whether it's mobile, landline or VoIP, and roughly where it's registered.
Shows carrier, line type and location. Owner name isn't available here.
Results are for personal, informational use only and may not be used for employment, credit, housing or tenant-screening decisions.
Area code 557: frequently asked questions
Where is the 557 area code located?
The 557 area code is located in Missouri, centered on St. Louis. It covers Saint Louis and nearby communities including St. Louis, Florissant, Affton, Ferguson, Hazelwood, Kirkwood.
What time zone is 557 in?
Area code 557 is in the Central time zone (UTC-6 (CST) / UTC-5 (CDT)). You can see the exact current local time for St. Louis on the live clock above.
What cities use area code 557?
Cities and areas that use 557 include St. Louis, Florissant, Affton, Ferguson, Hazelwood, Kirkwood. Its primary city is St. Louis, MO.
Do I need to dial 1 before 557?
For calls within the US, you do not need to dial a leading 1, but you do need all ten digits: 557 plus the seven-digit number. The 557 area requires ten-digit dialing because more than one area code serves it.
Is 557 a toll-free or scam number?
No — 557 is a normal geographic area code for St. Louis, not a toll-free code (toll-free codes are 800, 833, 844, 855, 866, 877 and 888). A 557 number is not inherently a scam, but the code can be spoofed. See the spam-call section above for how to tell.
What are the overlay area codes for 557?
Area code 557 is overlaid by 314, meaning those codes cover the same geographic area.