Official NPS reports state the number as 483,319 visitors.
In 2009 it had 503,856 visitors.
Mammoth Cave has 5 levels of passages.
morm them a millal
About 500,000.
About 591 kilometers of mapped area.
More then 390 miles of passageways have been mapped.
The height and width of Mammoth Cave varies depending on where you happen to be in the cave. Its explored length is about 400 miles (over 600 km), and spelunkers report that there are still many more miles to discover.
It is difficult to determine exactly how many miles of Mammoth Cave have not been discovered as the cave system is constantly being explored and mapped. However, the known explored length of Mammoth Cave is over 400 miles, making it the longest known cave system in the world.
There are more than 300!
You'd have to study the surveys or formal reports by the cave's explorers to establish that. Generally cavers don't usually count the number of passages (just that, not "~ways") but do quote the total length surveyed - approaching 400miles for the Mammoth / Flint Ridge System.
Over 390 miles.
Over 390 miles of passageways have been mapped.