ALT U.S. Federal Route 40 runs east-west in West-Central Frederick County. It runs from near Frederick to the Washington/Frederick County Line, near the Washington Monument State Park. ALT U.S. Rt. 40 passes through the following towns in Frederick County. Frederick Braddock Heights Middletown ALT U.S. Rt. 40 is not multi-plexed in Frederick County. ALT U.S. Rt. 40 intersects the following highways in Frederick County. U.S. Rt. 40, near Frederick. Interstate 70, near Frederick. Maryland State Route 17, at Middletown.
