557 area code
Where the 557 area code is, its overlay and how to dial a +1 557 number from anywhere.
The 557 area code is in Missouri, United States (Central (CT)). To call from abroad: +1 557 555-0123. It is an overlay, so all 10 digits are dialled.
The 557 area code is a geographic North American Numbering Plan (NANP) code covering Missouri. It has been in service since 30-Oct-2000 and sits in the Central (CT) time zone.
How to dial a 557 number
+1 557 555-01231 557 555-0123557 555-0123Other Missouri area codes
Frequently asked questions
Where is the 557 area code?
The 557 area code is in Missouri, United States (Central (CT)).
Is 557 an overlay area code?
Yes. 557 overlays the same region as 314, so callers dial all 10 digits.
Do I have to dial 10 digits for 557?
Yes — dial the area code plus the seven-digit number.
How do I call a 557 number from another country?
Dial your exit code (or +), then 1, then 557, then the number: +1 557 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 557 number does not pinpoint a street or ZIP code.
Number holders in area code 557
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 95 prefixes are in use in 557, shared by 19 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| New Cingular Wireless PCS, LLC | 23 | 24% |
| Onvoy, LLC | 17 | 18% |
| Teleport Communications America, LLC | 15 | 16% |
| Multiple Ocn Listing | 9 | 9% |
| Cellco Partnership Dba Verizon Wireless | 8 | 8% |
| 5 | 5% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
Complaints about 557 numbers
- Reports to the FTC, last 30 days
- 19
- Recorded messages or robocalls
- 47%
- Rank among area codes
- #398 of 670
- Most reported subjects
- Other (13)
- Calls pretending to be government, businesses, or family and friends (4)
- Dropped call or no message (1)
Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.
Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).
All US area codes United States +1 Map of area code 557 — cities & rate centres