Piscataway Park is a National Park Service-protected area located 20 miles southwest of downtown Washington, D.C. in and around Accokeek, Maryland. It protects the National Colonial Farm, Marshall Hall, and the Accokeek Creek Site. The park is located across the Potomac River from George Washington's Mount Vernon estate. Piscataway Park is named after Piscataway Creek, itself named for a Native American tribe.