Piercys Mill is an unincorporated community in Greenbrier County, West Virginia, United States. Piercys Mill is 10.8 miles (17.4 km) north-northeast of Alderson.
Within the community is Piercy's Mill Cave, a privately-owned cavern that extends just under a mile. A stream flows out of the cave's mouth and into Muddy Creek, a tributary of the Greenbrier River. A side passage inside of Piercy's Mill Cave leads to a series of rimstone dam rooms.
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