Which airport code is assigned to Miami, Florida?

The airport code assigned to Miami, Florida, is MIA. This code stands for Miami International Airport, which is one of the busiest airports in the United States and serves as a major hub for American Airlines. The three-letter airport code is used internationally to identify airports and helps in reducing confusion that might arise from similar-sounding names.

The other codes provided do not correspond to Miami. MAR could refer to a different location, such as Maracaibo in Venezuela, MSN is the code for Madison, Wisconsin, and MEX is the airport code for Mexico City, Mexico. Each of these codes is specific to different airports, highlighting the importance of unique identifiers in the aviation industry.