What is the city code for St. Louis, Missouri?

The city code for St. Louis, Missouri, is STL. City codes are typically designated three-letter codes used to identify airports and cities, making it easier for travelers and airline staff to reference locations. STL is a well-established code for St. Louis Lambert International Airport, which serves as the main airport for the area. This code reflects the city's name, making it intuitive for frequent travelers and airlines to recognize as representative of St. Louis.

The other options represent different cities and do not correspond to St. Louis. MEX is the code for Mexico City, IND is for Indianapolis, Indiana, and RSW is used for Southwest Florida International Airport. Knowing these codes is essential for understanding and navigating air travel effectively, making STL an important identifier for St. Louis.