St. Louis, Missouri

Where Is Area Code 557?

Area code 557 is in eastern Missouri and serves the St. Louis telephone service area. It is an overlay area code for the same region as area code 314. This area sits along the Mississippi River at the Missouri-Illinois border.

Area code 557 covers the independent City of St. Louis and parts of St. Louis County. Communities in this calling area include St. Louis, Kirkwood, Webster Groves, and other nearby places that already used 314 numbers. The exact service area follows the existing 314 footprint rather than county lines alone.

This area includes well-known St. Louis landmarks. These include the Gateway Arch, Forest Park, and major institutions such as Washington University in St. Louis and Saint Louis University. The Mississippi River is the main geographic feature tied to the region.

History of Area Code 557

Area code 557 was approved as an overlay for area code 314 in Missouri. The Missouri Public Service Commission approved the new code in 2021 after forecasts showed that 314 numbers were running low. The North American Numbering Plan Administrator set up 557 to serve the same area as 314.

Area code 557 entered service on August 12, 2022. It did not replace 314, and it did not split the region into two separate geographic zones. The change reflected long-term growth in demand for phone numbers from mobile phones, businesses, and other connected devices.

Key Facts About Area Code 557

• Area code 557 is in Missouri, and its main city is St. Louis.
• Area code 557 serves the same geographic area as area code 314.
• Area code 557 is an overlay area code, not an original area code and not a geographic split.
• Area code 557 entered service on August 12, 2022.
• Area code 557 covers the City of St. Louis and parts of St. Louis County.
• Area code 557 is in the Central Time Zone.
• Ten-digit dialing is required in the 314 and 557 service area because 557 overlays 314.
• The 557 area includes major St. Louis institutions and landmarks such as the Gateway Arch, Forest Park, Washington University in St. Louis, and Saint Louis University.

Frequently Asked Questions

What state is area code 557 in?

Area code 557 is in Missouri.

What major cities use area code 557?

Area code 557 serves St. Louis and nearby communities in the 314 service area, including places such as Kirkwood and Webster Groves.

Is area code 557 a toll-free number?

No. Area code 557 is a geographic area code for the St. Louis, Missouri region.