It runs from the Maryland border at the Mason–Dixon line in Mount Joy Township north to U.S. Route 15 Business (US 15 Bus.)

North of here, the route passes through Round Top and serves Gettysburg National Military Park before reaching its northern terminus.

From the state line, the route heads north along two-lane undivided Taneytown Road through agricultural areas with a few homes and patches of woods in Mount Joy Township.

Past this interchange, the road enters the grounds of Gettysburg National Military Park and passes through the community of Round Top.

[7] A west gate for the Gettysburg National Cemetery was built on Taneytown Road at Cemetery Hill, followed by the nearby entrance gate to the Gettysburg National Military Park designed by Emmor Cope for Grand Central Avenue's north end on the Taneytown Road's west side.