What is 314 area code?

The 314 area code is located in the eastern part of the state of Missouri in the United States. It primarily serves the city of St. Louis and the majority of its inner-ring suburbs. Established in 1947, 314 was one of the original area codes created by the North American Numbering Plan. Over the years, the area code's reach was reduced due to population growth and the subsequent creation of new area codes, like 636, to serve surrounding areas. The 314 area code is notable for covering a significant urban area and is associated with a vibrant cultural and historical city known for its landmarks such as the Gateway Arch.