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# Missouri Area Code 314
The 314 area code serves the St. Louis metropolitan area in Missouri, covering the city of St. Louis and surrounding communities in the eastern portion of the state. Established in 1947 as one of the original area codes created under the North American Numbering Plan (NANP), the 314 area code has been integral to the region's telecommunications infrastructure for over seven decades. This area code encompasses a significant population center and serves as a vital communication hub for businesses, residents, and institutions throughout the greater St. Louis region, including areas like Clayton, Webster Groves, and Kirkwood.
The North American Numbering Plan is a standardized system that organizes telephone numbers across the United States, Canada, and several other North American territories. Developed by AT&T in the 1940s, the NANP assigns three-digit area codes to geographic regions, with the first digit traditionally indicating the region's size and location. Area codes like 314 were systematically assigned based on population density and geographic boundaries to ensure efficient call routing and network management. As telecommunications technology has evolved, area codes have been supplemented with overlay codes and new assignments to accommodate growing demand, though the original 314 area code remains the primary identifier for St. Louis's telephone infrastructure.