Known as Popes Creek Road, the state highway runs 1.73 miles (2.78 km) from SR 3 near Potomac Mills east to George Washington Birthplace National Monument in northwestern Westmoreland County.

The state highway heads straight east-northeast through a forested area with intermittent farmland.

As SR 204 approaches George Washington Birthplace National Monument, the state highway passes between fields and is flanked by rows of trees.

The state highway reaches its eastern terminus at the entrance to the national monument, just east of which is a four-leg roundabout that contains in its center a replica of the Washington Monument.

The section from SR 3 to the George Washington Birthplace was a renumbering of State Route 610, and a second section from US 360 north to Oak Row was a renumbering of State Route 609.