Benjamin Banneker: SW-9 Intermediate Boundary Stone

Benjamin Banneker: SW-9 Intermediate Boundary Stone is a sandstone block in Falls Church Park, Arlington, that rises about 15 inches above ground and is surrounded by a protective iron fence. The stone carries inscriptions on different sides, including 'Jurisdiction of the United States' facing northeast and 'Virginia' on the opposite side.

President George Washington commissioned a series of forty boundary stones in 1791 to define the District of Columbia's perimeter as part of establishing the new capital. Surveyors including Banneker used mathematical and astronomical methods to mark these boundaries with precision.

The stone honors Benjamin Banneker, a free African American who worked as a mathematician and astronomer to help survey Washington D.C.'s original borders. His participation reflects the important role that Black professionals played in shaping the young nation's capital.

The stone is located in Falls Church Park and is easy to spot thanks to its protective iron fence marking the spot. It is best visited during daylight hours when you can clearly read the inscriptions on all sides.

This stone was the first among all District of Columbia boundary markers to be officially listed in the National Register of Historic Places. This recognition honored both its role in the historic survey and Banneker's remarkable contributions to the project.

GPS coordinates: 38.88252,-77.15889

Latest update: December 13, 2025 12:25