557 Area Code
The 557 area code serves St. Louis and most of its inner-ring suburbs in St. Louis County, Missouri.
Federal Data
State Data
County Data
City Data
The 557 area code serves St. Louis and most of its inner-ring suburbs in St. Louis County, Missouri.
Federal Data
State Data
County Data
City Data
Phone numbers with the 557 area code originate from the core of the St. Louis area, including the city of St. Louis and its inner-ring suburbs.
Area code 557 is an overlay to area code 314. Area code 314 was established in 1947. Area code 557 was added on August 12, 2022. Ten-digit dialing is required.
Area code 557 is a general purpose code which was placed in service on August 12, 2022.
Our Missouri phone number lookup service will analyze the three-digit prefix of any 557 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Missouri geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
| Company | Number of Prefixes |
|---|
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
| Rate Center | Number of Prefixes |
|---|
Browse other Missouri area codes: