ALT U.S. Federal Route 40 is an eat-west highway in Northern Garrett County. It runs from the Garrett/Allegany County Line, near Frostburg, to U.S. Rt. 40, at Keyers Ridge. ALT U.S. Rt. 40 passes through the following towns in Garrett County. Grantsville
Keyers Ridge ALT U.S. Rt. 40 is not multi-plexed in Garrett County. ALT U.S. Rt. 40 intersects the following highways in Garrett County. Maryland State Route 546, near Frostburg. U.S. Rt. 219, near Grantsville.