U.S. Federal Route 20 runs east-west across Winnebago County. Through out the whole county, this highway is multi-lane. Around the southside of the Rockford Metro-Area, U.S. Rt. 20 is a expressway. U.S. Rt. 20 passes through the following towns in Winnebago County. Rockford Cherry Valley U.S. Rt. 20 is multi-plexed in Winnebago County. Interstate 39, from Rockford to Cherry Valley. U.S. Rt. 51, from Rockford to Cherry Valley.
Branches of U.S. Rt. 20 in Winnebago County. EB U.S. Rt. 20 east of the Stephenson/Winnebago County Line. EB U.S. Rt. 20 near Winnebago. EB BUSN U.S. Rt. 20 on the westside of Rockford. EB U.S. Rt. 20 near IL St Rt 251. Winnebago County mile marker. EB U.S. Rt. 20 at I-39/U.S. Rt. 51. A BGS on EB I-90; SB I-39/U.S. Rt. 51.