The area code 314 is located in Florissant, Missouri.
Area code 314 serves Florissant, Missouri, and much of the core St. Louis metro. It covers the independent City of St. Louis and nearby north and central St. Louis County, placing Florissant in a long‑established hub for business, culture, and travel. The region includes major landmarks like the Gateway Arch National Park, Forest Park, and St. Louis Lambert International Airport (STL). Established in 1947, 314 is one of the original North American Numbering Plan area codes, giving it deep roots in Missouri’s phone history.
“Area code 314 was assigned in 1947 as one of the original area codes in the North American Numbering Plan.” — North American Numbering Plan Administrator (NANPA)
Cities and communities commonly associated with area code 314 include:
In 1996, 314 split to create 573, and in 1999 it split again to form 636, narrowing 314 to the urban core. To add more numbers without changing existing ones, Missouri introduced the 557 overlay in 2022, and local calls now use 10‑digit dialing. An interesting local tradition is “314 Day” on March 14, when St. Louis celebrates its area code with community events and hometown pride. Phones in the 314/557 region follow Central Time (CT), and numbers are part of the U.S. +1 country code, making 314 a recognizable signal of the St. Louis–Florissant area for both wireless and landline phone numbers.