A United States Post Office is located behind the Caver's Camp Store near the Mammoth Cave Campground. (270)758-2311.
The postal code for Mammoth Cave is 42259.
Mammoth Cave postage stamp and special cancellation issued May 27, 2006.
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Did You Know?
Mammoth Cave is the world's longest known cave. In fact it is so long that if the second and third longest caves in the world were joined together, Mammoth Cave would still be the planet's longest cave and have nearly 100 miles left over!