Caneyville, KY

ZIP code 42721 covers the expansive terrain of the Mammoth Cave National Park in Edmonson County, Kentucky. Within this area lies the world's longest known cave system, which is a UNESCO World Heritage Site. Visitors can explore various cave tours and hiking trails that lead to stunning underground formations such as the Frozen Niagara and Mammoth Dome. The ZIP code is also home to the Green River, offering opportunities for water recreation.