Find any 557- phone number in Missouri

The 557 area code is an area code located in the North American Numbering Plan (NANP). It was established in 2003 to provide more telephone numbers to the state of Missouri. The area code services the eastern part of the state, including places such as the St. Louis metropolitan area and the city of Columbia. It is bordered by the 636, 314, 417, 660, and 479 area codes.

The North American Numbering Plan is a system that assigns telephone numbers to geographic areas, giving each area a unique three-digit area code. This system was developed in 1947 to provide sufficient telephone numbers for large cities as well as small towns across the United States, Canada, and its territories. The NANP is managed by the US Federal Communications Commission and remains in use today, with some updates to adjust to the large increase in telephone numbers since 1947.