US 20 continues through Stone Park and Melrose Park before turning south and joining U.S. Routes 12/45 on Mannheim Road. In La Grange, the combined U.S. 12, 20, and 45 traveling on La Grange Road intersect with Ogden Avenue, which carries U.S. 34, one of the few places where four US numbered highways intersect. La Grange Road continues south until U.S. 20 turns onto 95th Street eastbound with U.S. 12. This combination later joins with U.S. Route 41, where the three routes follow Ewing Avenue and Indianapolis Boulevard, which are the last portions of US 20 prior to its crossing the state line into Indiana.