The Orange Line is a rapid transit line in Chicago, Illinois, operated by the Chicago Transit Authority (CTA) as part of the Chicago "L" system. It is approximately 13 miles (21 km) long and runs on elevated and at grade tracks and serves the Southwest Side, running from the Loop to Midway International Airport. As of 2023, an average of 16,979 weekday riders board at stations served exclusively by the Orange Line, or roughly 32,000 daily riders total including shared stations.