U.S. Federal Route 40 is the only east-west surface highway in Clark County. It runs through the central portion of the county. Clark County is the eastern most county in Illinois that U.S. Rt. 40 passes through. U.S. Rt. 40 passes through the following town in Clark County. Casey
Marshall
U.S. Rt. 40 is multi-plexed in Clark County. Interstate 70, near State Line.
U.S. Rt. 40 intersects the following highways in Clark County. Illinois State Route 49, at Casey.
EB U.S. Rt. 40 at the Clark/Cumberland County Line. EB U.S. Rt. 40 east of IL St Rt 49. EB U.S. Rt. 40 at IL St Rt 49. WB U.S. Rt. 40 in Casey. EB U.S. Rt. 40 northwest of Marshall. EB U.S. Rt. 40 west of IL St Rt 1. WB U.S. Rt. 40 east of IL St Rt 1. WB U.S. Rt. 40 at National Road. A Clark County mile marker. WB U.S. Rt. 40 near East Little Creek. WB U.S. Rt. 40 west of I-70. A BGS on WB I-70/U.S. Rt. 40. A BGS on WB I-70/U.S. Rt. 40. A BGS on EB I-70. WB I-70/U.S. Rt. 40 east of west I-70. WB I-70/U.S. Rt. 40 at the Illinois Welcome Sign. EB I-70/U.S. Rt. 40 at the Indiana/Illinois State Line. WB I-70/U.S. Rt. 40 at the Illinois/Indiana State Line.
