Which city code is used for Columbus, Ohio?

The city code for Columbus, Ohio, is CMH. This code is derived from the port of entry, which is conveniently located in the area and is designed to be easily identifiable for travelers and airlines. CMH stands for "Columbus Metropolitan Airport," which serves as the primary airport for Columbus and is the key identifier used in flight schedules, booking systems, and various airline communications.

The other codes provided in the options represent different cities and airports. CAK, for example, refers to Akron-Canton Airport, which is located in the nearby areas of Akron and Canton, Ohio. BUF is the code for Buffalo Niagara International Airport in New York, and CLT is the code for Charlotte Douglas International Airport in North Carolina. Each code is distinct to its respective city and airport, making it crucial for travelers to recognize these identifiers accurately.