Illinois State Route 1 is a north-south highway in Eastern Clark County. This runs from near West York to near Oliver. IL St Rt 1 passes through the following towns in Clark County. West Union
Walnut Prairie Snyder Ernst Marshall
IL St Rt 1 is not multi-plexed in Clark County. IL St Rt 1 intersects the following highways in Clark County. U.S. Rt. 40, at Marshall.
A BGS on EB I-70. A BGS on WB I-70. A Clark County mile marker. NB IL St Rt 1 north of U.S. Rt. 40. A street sign on National Road. NB IL St Rt 1 near Locust Street. NB IL St Rt 1 south of Marshall. NB IL St Rt 1 north of West Union. NB IL St Rt 1 south of West Union. NB IL St Rt 1 north of West York. NB IL St Rt 1 at the Clark/Crawford County Line.
