Harper's Ferry is in Maryland, just across the Potomac from Loudoun County, where Waterford, VA, and Loudoun County's Goose Creek are. Migrants from Pennsylania and the port of Philadelphia (Germans, Scotch-Irish and others) crossed the Potomac River at Harper's Ferry and also a little further downstream at what is now the US Route 15 bridge connecting Maryland and Virginia. The Great Wagon Road that traversed from Pennsylvania down through the Shenandoah Valley, on the western side of the Blue Ridge Mountains, and on to Tennessee, Texas and Georgia, etc., went through Loudoun County. Those who did not take the Great Wagon Road on through the Shenandoah, took the route that is now US 15 through Loudoun County and down through Virginia on the Eastern side of the Blue Ridge Mountains. If Harper's Ferry is mentioned in your information about your ancestors, then Loudoun County's Goose Creek and Waterford are where your Quaker Meeting House must be located. See my previous message about Waterford's Quaker Meeting House. Francine