Illinois State Route 135 runs completely within Warren County. It runs north-south from Illinois State Route 164, near Kirkwood, to the Warren/Mercer County Line, near Little York. At the Warren/Mercer County Line it runs east-west along the county line to Alexis. IL St Rt 135 passes through the following towns in Mercer County. Little York
A junction marker on EB IL St Rt 164. The western end of IL St Rt 135. The western end marker. NB IL St Rt 135 south of Little York. NB IL St Rt 94/135 north of Little York. EB IL St Rt 135 near Norwood. EB IL St Rt 135 west of U.S. Rt. 67. A Warren County mile marker. EB IL St Rt 135 near Alexis. The eastern end of IL St Rt 135. The eastern end marker.
