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Before You Call Back

Area code 557

Area code 557 serves Missouri, including Saint Louis, Ladue and Kirkwood (Central time). It has been in service since August 12, 2022 and shares its area with 314.

Numbers starting with 557 drew 58 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 45 complaints to the FCC since November 2023. The number on your screen can be faked, so a 557 number proves nothing about where a call came from.

Location
MissouriSt. Louis, MO-IL Metropolitan Statistical Area
Time zone
Central
In service since
August 12, 2022Created from 314
Overlay
Same area as 314
Local calls
Dial 10 digitsArea code needed, even next door
Exchanges in use
84 of 792held by 18 carriers
Projected to run out
3Q 2060NANPA forecast 2026.2

Complaints about 557 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 557. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

58

FCC complaints since November 2023

45

Different 557 numbers reported

101

FCC complaints naming a 557 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 20230
December 20230
January 20240
February 20240
March 20242
April 20242
May 20241
June 20241
July 20243
August 20240
September 20241
October 20240
November 20240
December 20241
January 20251
February 20257
March 20250
April 20252
May 20254
June 20251
July 20251
August 20254
September 20255
October 20250
November 20250
December 20250
January 20260
February 20260
March 20261
April 20262
May 20261
June 20261
July 20260
August 20261
September 20260
October 20260

What people said 557 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 27 of 58 reports were robocalls.

Show as a table
SubjectReports
Other32
Calls pretending to be government, businesses, or family and friends8
Medical and prescriptions5
Reducing your debt (credit cards, mortgage, student loans)4
Dropped call or no message4
Work from home and business opportunities1

Places served by 557

NANPA lists 7 rate centers for 557. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Saint Louis36
  • Ladue17
  • Kirkwood13
  • Creve Coeur6
  • Mehlville5
  • Sappington5
  • Oakville2

Phone companies holding 557 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 99% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 18 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
New Cingular Wireless PCS, LLC - IL23
Onvoy, LLC - MO19
Teleport Communications America, LLC - MO15
Cellco Partnership dba Verizon Wireless - MO8
Onvoy Spectrum, LLC3
Five9, Inc.2
T-Mobile USA, Inc.2
Terra Nova Telecom Inc.2

When today's 557 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
20226
202327
202412
202520
202619

Check a 557 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in Missouri

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show