557 Area Code: St. Louis, Missouri
Area code 557 serves St. Louis, Ladue and Kirkwood, Missouri in the Central time zone, in service since 2022. Consumers have filed 83 unwanted-call complaints against 82 different 557 numbers, 17 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 557 at a glance
- State
- Missouri
- Main cities
- St. Louis, Ladue, Kirkwood, Creve Coeur, Sappington, Mehlville + 1 more
- Counties
- St. Louis County, St. Louis city
- Local time
- —Central
- In service since
- August 12, 2022
- Overlay of
- 314
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 7 rate centers, 84 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 557 numbers
No single 557 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
What calls from 557 numbers are about
44 FTC Do Not Call complaints about 557 numbers since Jul 24. The most common named subject is impostor calls (people pretending to be a government agency, a business or family), at 14% of complaints (67% of those were recorded messages). Overall, 55% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified2455%
- Impostor (government, business, family)614%
- No subject given49%
- Medical & prescriptions49%
- Dropped call / no message25%
- Debt reduction25%
- Work-from-home / make money12%
FCC complaints by call type, last 2 years
- Prerecorded Voice1161%
- Live Voice422%
- Text Message317%
17% of recent FCC complaints about 557 numbers are about text messages, not calls.
When 557 spam calls come in
38% of complaints that give a call time describe calls between 3pm and 6pm. 93% came Monday to Friday, most on Tuesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
FCC complaints about 557 numbers peaked in 2025 (16); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
57% of the FTC complaints about 557 numbers came from Missouri residents, but only 25% from people with 557 numbers themselves. The calls are mostly regional rather than aimed at 557 phones specifically.
Where complainants live
- Missouri2557%
- Ohio511%
- California25%
- Georgia25%
- Illinois25%
Carriers operating in 557
NANPA has assigned 84 557 prefixes (NPA-NXX central-office codes) across 7 rate centers: 40% to wireless carriers, 55% to landline and VoIP operators; 99% are pooled blocks shared by several carriers. 24 prefixes were assigned in the last 12 months (newest 2026-10-08). The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 23(27%) | 6 | 2026-09-09 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 19(23%) | 7 | 2026-10-08 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 15(18%) | 4 | 2025-11-12 |
| Verizon Wireless (Cellco Partnership) | Wireless | 8(10%) | 2 | 2026-07-23 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 3(4%) | 2 | 2024-11-07 |
| Five9, INC. | Unclassified | 2(2%) | 2 | 2023-06-15 |
| T-Mobile USA | Wireless | 2(2%) | 1 | 2023-09-29 |
| Terra Nova Telecom INC. | Competitive / VoIP (CLEC) | 2(2%) | 2 | 2022-09-16 |
| 8x8, INC. | Competitive / VoIP (CLEC) | 1(1%) | 1 | 2026-09-23 |
| Boost Subscriberco L.L.C. | Wireless | 1(1%) | 1 | 2025-02-25 |
| Callworks Corporation | Unclassified | 1(1%) | 1 | 2023-11-15 |
| Comcast (Xfinity Voice) | Competitive / VoIP (CLEC) | 1(1%) | 1 | 2023-03-27 |
Largest rate centers (exchanges) by prefixes: St. Louis (36), Ladue (17), Kirkwood (13), Creve Coeur (6), Mehlville (5), Sappington (5), Oakville (2). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 557 numbers
Before you call back
- Impostor (government, business, family) is the top named complaint here. Hang up and call the agency, bank or relative back on a number you already know. Government agencies don't demand payment by gift card, wire transfer or crypto. Read about Social Security impostor calls and fake bank fraud calls.
- Look up the full number above. A missed call from 557 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in Missouri
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: Missouri Attorney General.
- Missouri is one of the states that maintains its own Do Not Call registry alongside the federal National Do Not Call Registry, so telemarketers calling Missouri numbers are expected to check both lists. Registering on the federal list at donotcall.gov is free and never expires; the state list is administered separately and may have its own registration process and renewal period.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 557: questions answered from the data
Where is area code 557?
Area code 557 serves St. Louis, Ladue and Kirkwood, Missouri, covering St. Louis County and St. Louis city. It has been in service since August 12, 2022.
What time zone is area code 557 in?
Area code 557 is in the Central time zone (UTC−6, or UTC−5 during daylight saving time). The current local time is shown at the top of this page.
What are calls from 557 numbers usually about?
Since Jul 24, consumers filed 44 FTC Do Not Call complaints about 557 numbers. The most common named subject was impostor calls (people pretending to be a government agency, a business or family): 14% of complaints, 67% of them recorded messages. Across all subjects, 55% of callers who answered the question said the call was a robocall.
When do 557 spam calls happen?
38% of the complaints that give a call time describe calls between 3pm and 6pm, and 93% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 557 numbers really local?
Not necessarily. 57% of the FTC complaints about 557 numbers came from Missouri residents, but only 25% from people with 557 numbers themselves. The calls are mostly regional rather than aimed at 557 phones specifically.
How do I report a 557 scam call in Missouri?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In Missouri, the Missouri Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Overlay and nearby area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.