Current estimates suggest there are nearly 10,000 deer breeding operations in North America, and the number is growing......
This was in the response, but its just breading facilities, couldn't begin to guess one the # of private HF or outfitter HF properties out there.
# of whitetail hunters may be tough in some states since you don't have to buy any special license indicating you're hunting deer. A lot do though. Would be a total guess, but it has to be in the 10s of millions.