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Area codes 314 and 557 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of Missouri, serving the city of St. Louis and most of its inner-ring suburbs in neighboring St. Louis County.
Find out the area codes for different regions of Missouri, including St. Louis and its suburbs. Learn about the history and allocation of area codes in the state.
Lookup area code 314 details: major cities and timezone. View the 314 area code map in Missouri. Find the name of any phone number in area code 314.
Saint Louis, MO uses area codes 314 and 557, which are both overlaid on the same geographic area. Learn more about Saint Louis, MO area code information, time zone, and other Missouri area codes.
To find information on a specific area code, use the area code lookup that makes it easy to find an area code by number and gives detailed information including city/state, timezone, and area code maps.
Find out how to call Saint Louis, Missouri from another country with the exit code, country code and area code. See the list of Saint Louis zip codes and the current local time in Saint Louis.
Missouri currently utilizes 9 area codes. When first established by AT&T and the Bell System in 1947, 314 covered eastern Missouri including St. Louis and 816 covered northwestern Missouri including Kansas City. The most recently added was 235 in 2024 as an overlay to 573.
