U.S. Federal Route 40 runs east-west in Northern Warren County. This highway is completly multi-plexed with Interstate 70 through this county. U.S. Rt. 40 passes through the following towns in Warren County. Wright City
Warrenton
U.S. Rt. 40 is multi-plexed in Warren County. Interstate 70, through Warren County.
WB I-70/U.S. Rt. 40 at the St. Charles/Warren County Line. WB I-70/U.S. Rt. 40 east of Wright City. WB I-70/U.S. Rt. 40 at Wright City. WB I-70/U.S. Rt. 40 at Warrenton. A junction marker on NB MO St Rt 47. A guide marker on NB MO St Rt 47. WB I-70/U.S. Rt. 40 near Pendleton.