557 Area Code
St. Louis (overlay), Missouri
Area code 557 is located in St. Louis (overlay), Missouri. It covers St. Louis, Clayton, and surrounding areas in the Central time zone (UTC-6). Administered by NANPA.
Where is area code 557?
Area code 557 is located in St. Louis (overlay), Missouri. It covers St. Louis, Clayton, and surrounding areas in the Central time zone (UTC-6).
Cities Covered by Area Code 557
Area code 557 primarily serves the St. Louis (overlay) area of Missouri. The exact coverage includes St. Louis, Clayton, and Chesterfield, along with surrounding communities and suburbs.
Time Zone
Central Time — UTC-6
Area code 557 operates in the Central Time Zone. When calling 557 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 557
Area code 557 was introduced in 2022 as a geographic area code serving St. Louis (overlay), Missouri. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.