I’ve noticed ORD is the codename for Chicago International O'Hare Airport. What actually does the letters ORD stand for? Usually, the letters have the city’s name in the code name.

Literally what everyone said. Honestly.

It was originally an military field called Orchard Field now its a commercial airport called ohare international Airport

ORD stands for "Orchard" Chicago’s O’Hare International Airport was the site of an aircraft factory known as Orchard Place.

ORD is a reference to the original airport name - Orchard Park. It was later renamed for pilot Bud O'Hare.