Area code 314, Telephone prefix in St. Louis, United States.
Area code 314 is a telephone prefix serving the central region of St. Louis and its immediate suburbs in St. Louis County, Missouri. It spans multiple neighborhoods and districts, covering both densely populated urban areas and residential zones.
The North American Numbering Plan established area code 314 in 1947 as one of the original telephone prefixes to serve the eastern Missouri region. This early assignment made it a core element of the region's telephone infrastructure during the development of the modern telecommunications network.
Area code 314 connects residents across diverse St. Louis communities, creating a shared identity for people living in the urban core and surrounding neighborhoods along the Mississippi River region.
Residents within the 314 area code need to dial all ten digits, including the area code, when making local calls due to overlay regulations in the region. This requires the complete number even for calls within the same local area.
In 2022, the Missouri Public Service Commission introduced area code 557 as an overlay to expand the numbering capacity of the 314 region. This means many new phone numbers are now assigned under 557 while existing 314 numbers remain active.
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