U.S. Federal Route 6 is an east-west highway in Dallas County. It runs from the Dallas/Madison Couny Line, near Dexter, to the Dallas/Polk County Line, at Clive. U.S. Rt. 6 passes through the following towns in Dallas County. Adek Waukee Clive U.S. Rt. 6 is multi-plexed in Dallas County. Interstate 80, near De Soto.