What is the city code for Honolulu, Hawaii?

The city code for Honolulu, Hawaii, is HNL. This code is part of the International Air Transport Association (IATA) airport code system, which assigns three-letter codes to airports worldwide. HNL is specifically designated for Daniel K. Inouye International Airport, which serves Honolulu and is the main gateway to Hawaii. The use of HNL helps airlines, travel agencies, and passengers easily identify the airport associated with Honolulu, streamlining travel logistics.

In contrast, the other options represent different airports in the United States: ORD is the code for O'Hare International Airport in Chicago, Illinois; DEN refers to Denver International Airport in Colorado; and CLT represents Charlotte Douglas International Airport in North Carolina. Each of these codes corresponds to major airports in their respective cities, but none are related to Honolulu. Thus, HNL is the correct and relevant choice for Honolulu's city code.