Joplin is an unincorporated community and former town in Prince William County, Virginia. The town was located on land taken to form Chopawamsic Recreational Demonstration Area[1] and is now part of Prince William Forest Park, a National Park Service property located adjacent to Marine Corps Base Quantico. The remains of the town, now just a collection of homes, lies on a stretch of Va. 619, Joplin Road, about 3 miles west of Dumfries.