557 area code
Area code 557 is in Missouri. It covers Saint Louis, Oakville, Mehlville and 67 other places: 70 ZIP codes in St. Louis County, St. Louis city and St. Charles County. Local time there is , Central Time. In service since 2022 as an overlay: it covers the same area as 314, so a number from there can have either code.
- State
- Missouri
- Time zone
- Central
- Largest city
- Saint Louis
- Overlays
- 314
- In service since
- 2022
- Rate centres
- 7
- Prefixes assigned
- 84 (840,000 numbers)
Who calls from a 557 number
NANPA records the carrier each block of 557 numbers is assigned to. Of the 787,000 557 numbers assigned, 59% are with cable, internet-calling, business and other carriers (Onvoy, Teleport Communications (AT&T) and Bandwidth); 41% with mobile carriers (AT&T Mobility, Verizon Wireless and Boost Mobile).
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| Onvoy | Cable, VoIP, other | 33% |
| AT&T Mobility | Mobile | 32% |
| Teleport Communications (AT&T) | Cable, VoIP, other | 18% |
| Verizon Wireless | Mobile | 6% |
| Boost Mobile | Mobile | 2% |
| Bandwidth | Cable, VoIP, other | 2% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 557
The 7 places with a telephone rate centre of their own using 557, largest first. Each links to its ZIP codes.
| Place | ZIP codes | Population |
|---|---|---|
| Saint Louis, MO | 68 | 288,512 |
| Oakville, MO | — | 35,333 |
| Mehlville, MO | — | 29,805 |
| Kirkwood, MO | — | 29,363 |
| Creve Coeur, MO | — | 18,643 |
| Ladue, MO | — | 8,940 |
| Sappington, MO | — | 7,367 |
Nearby places using 557
These places have no rate centre of their own in NANPA's records; the nearest one uses 557. Near an area-code boundary that can be wrong for part of a town.
- Webster Groves
- Affton
- Concord
- Ferguson
- Spanish Lake
- Lemay
- Overland
- Jennings
- St. Ann
- Crestwood
- Bellefontaine Neighbors
- Sunset Hills
- Maplewood
- Brentwood
- Black Jack
- St. John
- Shrewsbury
- Glendale
- Glasgow Village
- Dellwood
- Breckenridge Hills
- Normandy
- Woodson Terrace
- Northwoods
- Moline Acres
- Riverview
- Pine Lawn
- Green Park
- Pagedale
- Bel-Ridge
- Warson Woods
- Castle Point
- Hanley Hills
- Marlborough
- Vinita Park
- Wellston
- Charlack
- Oakland
- Bel-Nor
- Calverton Park
- St. George
- Cool Valley
- Lakeshire
- Flordell Hills
- Pasadena Hills
- Velda City
- Grantwood Village
- Edmundson
- Hillsdale
- Velda Village Hills
- Country Club Hills
- Norwood Court
- Greendale
- Pasadena Park
- Bella Villa
- Sycamore Hills
- Wilbur Park
- Beverly Hills
- West Alton
- Kinloch
ZIP codes in area code 557
70 ZIP codes in 3 towns, by the town each is mailed to, largest first. Each links to its own page.
- Saint Louis
- 63101, 63102, 63103, 63104, 63105, 63106, 63107, 63108, 63109, 63110, 63111, 63112, 63113, 63114, 63115, 63116, 63117, 63118, 63119, 63120, 63121, 63122, 63123, 63124, 63125, 63126, 63127, 63128, 63129, 63130, 63131, 63132, 63133, 63134, 63135, 63136, 63137, 63138, 63139, 63140, 63141, 63143, 63144, 63145, 63146, 63147, 63150, 63151, 63155, 63156, 63157, 63158, 63160, 63163, 63164, 63166, 63167, 63169, 63171, 63177, 63178, 63179, 63180, 63182, 63188, 63195, 63197, 63199
Where 557 numbers are issued
NANPA's rate centres with the most 557 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
ST LOUIS | Saint Louis | 36 |
LADUE | Ladue | 17 |
KIRKWOOD | Kirkwood | 13 |
CREVECOEUR | Creve Coeur | 6 |
MEHLVILLE | Mehlville | 5 |
SAPPINGTON | Sappington | 5 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 557
Where is area code 557?
Area code 557 is in Missouri. It covers Saint Louis, Oakville, Mehlville and 67 other places: 70 ZIP codes in St. Louis County, St. Louis city and St. Charles County.
What ZIP codes are in area code 557?
70 ZIP codes, by the town each is mailed to: Saint Louis (68, 63101 to 63199), St. Ann (63074), West Alton (63386). The full list is on this page.
What time zone is area code 557 in?
Central time.
Is a 557 number a mobile or a landline?
It can be either. 41% of 557 numbers are assigned to mobile carriers and 0% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
What area codes overlay 557?
314. They cover the same area as 557, so a new number there can be given any of them.
Does a 557 number mean the caller is in Missouri?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 557 call can come from anywhere.
Other area codes in Missouri
- 235 Columbia
- 314 Saint Louis
- 417 Springfield
- 573 Columbia
- 636 Saint Charles
- 660 Sedalia
- 816 Kansas City
- 975 Kansas City
All 9 Missouri area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 557.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/557
Underlying data is public domain or openly licensed — sources, vintages and licences.