ORD is the airport code for Chicago O'Hare International Airport, which is located on the Northwest Side of Chicago, Illinois, United States. It is approximately 17 miles (27 kilometers) northwest of Chicago's Loop business district

. O'Hare International Airport is one of the busiest airports in the world and serves as a major hub for domestic and international flights. It covers about 7,627 acres and has four terminals along with eight runways, making it a large and highly connected airport

. The airport's code "ORD" originates from its original name, Orchard Field Airport, before it was renamed after Edward "Butch" O'Hare, a U.S. Navy flying ace

. In summary, ORD refers to Chicago O'Hare International Airport, located in Chicago, Illinois, on the city's Northwest Side.