U.S. Federal Route 40 is an east-west highway across Northern Montgomery County. It runs from the Montgomery/Preble County Line, near Wengerlawn, to the Montgomery/Clark County Line, near Phoneton. U.S. Rt. 40 passes through the following towns in Montgomery County. Arlington Clayton Englewood Vandalia U.S. Rt. 40 is multi-plexed in Montgomery County. Ohio State Route 48, at Englewood. U.S. Rt. 40 intersects the following highways in Montgomery County. Ohio State Route 49, near Clayton. Ohio State Route 48, at Englewood. Ohio State Route 48, at Englewood. Interstate 75, at Vandalia.
