The Snowtime-owned resorts (liberty, whitetail, roundtop) in Pennsylvania are closest to DC (about 1.5-2 hours from DC-proper, not 3). All have very short-runs, are vertically challenged, and ridiculously expensive. However, the need for a nearby session will inevitably lure you in.
WISP resort by Deep Creek Lake is the only one located in MD, right on the border of West VA. Much more and better quality terrain in comparison to the three above but about 2.5 hrs from DC.
Massanutten in VA is also there for you. This one I haven't checked out. Anyone want to chime in here?
Snowshoe in West VA and Seven Springs in PA are the ones that you really want to aim for if you're taking a multi-day trip in the immediate region. As stated, Snowshoe has pretty expensive ticket rates but Costco sells them discounted.