U.S. Federal Route 40 is an east-west highway across Southeastern Baltimore County. It runs from the Harford/Baltimore County Line, near Gunpowder, to the Baltimore County/City of Baltimore Line, near Rosedale. U.S. Rt. 40 passes through the following towns in Eastern Baltimore County. Gunpowder White Marsh Rosedale U.S. Rt. 40 is not multi-plexed in Eastern Baltimore County. U.S. Rt. 40 intersects the following highways in Eastern Baltimore County. Maryland State Route 43, near White Marsh. Maryland State Route 700, near Middle River. Interstate 695, near Rosedale. Maryland State Route 7, near Rosedale.
