U.S. Federal Route 20 runs east-west across the south-central portion of Boone County. This highway runs along the Interstate 90 corridor in the county. U.S. Rt. passes through the following towns in Boone County. Belvidere Garden Prairie U.S. Rt. 20 is not multi-plexed in Boone County. U.S. Rt. 20 crosses the following highways in Boone County. Interstate 90, (Addams Tollway) near Cherry Valley. (NO INTERHCANGE) BUSN. U.S. Rt. 20, at Belvidere.
