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What is the city code for St. Louis?

  1. STC

  2. STL

  3. SLG

  4. SLC

The correct answer is: STC

The city code for St. Louis is STL. This code is specifically designated to represent St. Louis Lambert International Airport, which is the primary airport serving the city. The use of STL aligns with the common practice of using three-letter codes for airports to ensure clarity and efficiency in travel. St. Louis is a major city, and its airport, STL, is well-known for both domestic and international flights. The other options do not correspond to St. Louis: STC is not recognized as a city code for any significant airport, SLG is not associated with St. Louis, and SLC corresponds to Salt Lake City. This demonstrates how the codes serve to distinctly identify different airports, ensuring travelers and airlines have clear information.