My ranking by skier visits would be:
Vail (1.75 million)
Breckenridge (1.3 million)
Mammoth (1.2 million)
Keystone (1 million)
Winter Park (1 million)
Steamboat (950K)
Beaver Creek (900K)
Heavenly (900K)
Copper (900K pre-POWDR)
Squaw (800K and now merged with Alpine Meadows)
Park City (a guess, numbers not published)
Snowmass (700K)
Killington
Other names tossed around in this thread:
A Basin only does about 450K.
Loveland doesn't release numbers but I'd bet it's comparable to A Basin.
Mount Bachelor peaked at 600K skier visits and is now down around 500K after all their local problems. Mount Hood Meadows now claims the most skier visits in Oregon at slightly more than 500K.
How Many Skier Visits Does K Do and How Does it Rank
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