What is the city code for Denver, Colorado?

The city code for Denver, Colorado, is DEN. This code is used by airlines and travel-related industries to uniquely identify Denver International Airport, which is the primary airport serving the city and the surrounding metropolitan area. These three-letter codes help streamline ticketing, baggage handling, and airport logistics by providing a consistent and standardized method for identifying locations.

The other options represent different cities and their respective airport codes. For instance, FLL corresponds to Fort Lauderdale, Florida; BNA is the code for Nashville, Tennessee; and HOU stands for Houston, Texas. Each of these codes serves a different city and is important for travel and logistics, but they do not relate to Denver. Therefore, understanding these codes can assist travelers in efficiently navigating airport services.