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557 Area Code

Area code 557 serves St. Louis, Oakville, University City, Kirkwood, Mehlville and nearby communities in Missouri. It has been in service since August 12, 2022, when it was split from 314.

StateMissouri
Time zoneCentral
Local time now…
Prefixes in use84
Overlay with314
Projected to run out2060
St. LouisOakvilleUniversity CityKirkwoodMehlvilleMaryland HeightsWebster GrovesArnoldAfftonCreve CoeurSpanish LakeConcordFergusonClaytonLemayOverlandJenningsSt. AnnCrestwoodTown and CountryBellefontaine NeighborsDes PeresRichmond HeightsSunset HillsOlivetteLadueBrentwoodMaplewoodBerkeleySappingtonSt. JohnShrewsburyGlendaleGlasgow VillageSt. LouisOakvilleAffton
Cities and towns served by area code 557

Who issues 557 numbers

Mobile 39%VoIP and cable 46%Landline 14%

Share of the 84 prefixes (the three digits after 557) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T Mobility23
Onvoy (Sinch)22
AT&T (Teleport)15
Verizon Wireless8
T-Mobile2
Five92
Terra Nova Telecom2
Comcast (Xfinity)1

Cities and towns in area code 557

CityPopulationOther area codes
St. Louis278,144314
Oakville35,166314
University City34,657314
Kirkwood29,331314
Mehlville29,089314
Maryland Heights27,559314
Webster Groves23,450314
Arnold20,994314
Affton20,035314
Creve Coeur18,480314
Spanish Lake18,183314
Concord18,028314
Ferguson17,953314
Clayton17,807314
Lemay16,431314
Overland15,474314
Jennings13,093314
St. Ann12,617314
Crestwood12,207314
Town and Country11,619314
Bellefontaine Neighbors10,368314
Des Peres9,102314
Richmond Heights9,093314
Sunset Hills9,075314
Olivette8,937314
Ladue8,934314
Brentwood8,079314
Maplewood8,033314
Berkeley8,026314
Sappington6,882314
St. John6,441314
Shrewsbury6,231314
Glendale6,060314
Glasgow Village5,491314

Got a call from 557?

A 557 number was originally issued in Missouri, but that does not prove the caller is there. 46% of 557 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 84 prefixes in area code 557

Format: (557) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 557

Where is area code 557?
Area code 557 is in Missouri. It covers St. Louis, Oakville, University City, Kirkwood, Mehlville, Maryland Heights and 28 more cities and towns.
What time zone is area code 557?
Area code 557 is in the Central time zone.
Is 557 a toll-free number?
No. 557 is a geographic area code in Missouri. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 557 share its area with 314?
314 and 557 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 557 run out of numbers?
NANPA's latest forecast projects the 314/557 overlay to exhaust in the fourth quarter of 2060. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Missouri