Arnold City is an unincorporated community and census-designated place in Washington Township, Fayette County, Pennsylvania, United States. It is located approximately east of the borough of Belle Vernon, in far northwestern Fayette County. As of the 2020 census, Arnold City had a population of 462.
Like many towns in the area, Arnold City has been home to many coal miners supporting the coal industry in the region. The town supported housing for several nearby coal mines, including the Naomi Mine in Fayette City. Housing was constructed by the Hillman Coal and Coke Company, creating a Coal Patch Town,
In addition to the Naomi mine, four additional mines operated in the area:
The village was the location of mine strike-related violence in 1931.