I know each resort reports the overall vertical of all slopes but does anyone know what single slope has the most vertical?

I'm pretty sure it's Cupp Run (and sister slope Shay's Revenge) at Snowshoe Mountain in West Virginia. Both should be right around 1,500 foot vertical.

Yep, Cupp Run and Shay's Revenge at Snowshoe has the most single run vertical in the Mid-Atlantic, approx. 1,500 vert. ft.
Other verticals of approx. 1000 ft. vertical include Highlands area at Wintergreen, most top-bottom slopes at Timberline, top to bottom at Whitetail, Paradice from top to bottom of lodge slope at Massanutten, top to bottom at SNO Mountain in PA, and at least one run at Sugar in NC, maybe a couple of slopes at Elk.
Anyone think of any others?
The Colonel

Blue Knob in Pa. has 1,072 ft.

Snö (old Montage) and Elk also have over 1K. Montage has two runs with over 1K.