Which city is identified by the code DCA?

The city identified by the code DCA is Washington, D.C. This designation comes from Ronald Reagan Washington National Airport, which is located in Arlington, Virginia, but primarily serves the Washington, D.C. metropolitan area. The airport's proximity to the nation’s capital makes the DCA code easily recognizable and directly associated with Washington, D.C.

Understanding airport codes is important, as they often reflect geographic or historical connections to the cities they serve. Each airport code is typically derived from the name of the city or the airport itself, and DCA is a clear example of that linkage.