Herriottsville is anunincorporated community inSouth Fayette Township, Allegheny County, Pennsylvania, United States. The community is located in the southeast corner of the township nearChartiers Run.[1] Herriottsville had one of the first post offices in South Fayette Township and was astagecoach stop on the Black Horse Trail.[2]
41°12′12″N77°11′40″W / 41.20332°N 77.19452°W /41.20332; -77.19452
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