Grindstone is an unincorporated community and census-designated place in Jefferson and Redstone townships, in Fayette County, Pennsylvania, United States. The community was a part of the Grind…Grindstone is an unincorporated community and census-designated place in Jefferson and Redstone townships, in Fayette County, Pennsylvania, United States. The community was a part of the Grindstone-Rowes Run CDP, before it was split into two separate CDPs for the 2010 census. As of the 2010 census, the population was 498. Its ZIP code is 15442.
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