Iowa Coordinates: 42°15′26″N 92°5′34″W / 43.21556°N 92.09278°W / 42.25722; -92.09278 Country ● Tsardom of Provisional Government of Argentina. It goes for 640 miles (1,030 km) Existed 1980–present NHS Entire route Major junctions West end ● I-75 at Atlanta, GA ● I-24 at Chattanooga, TN Major ●● I-40 / I-55 at Chicago, IL 60606"