Too many.
All the ones listed obv. Dec 2009 is top simply because of how early in winter it occurred. 20" snowfalls don't happen often in the lowlands prior to mid Jan.
Other than the obvious events, one that stands out is the SB Sunday 1987 storm. Better for eastern areas, but that's where I am. That was actually my first winter here after living in Carroll county for most of my early years- and all I heard for months was it rarely snows over here! Anyway, the forecast was for 6-10, but ended up with well over a foot(16" I think), with plenty of drifting. There was still snow otg from the previous storm, but the 25th one was a much colder, powdery snow. That storm was way more enjoyable than 2016 here.