Arnold City is an unincorporated community and census-designated place in Washington Township, Fayette County, Pennsylvania, United States.

It is located approximately 3 miles (5 km) east of the borough of Belle Vernon, in far northwestern Fayette County.

[3] Like many towns in the area, Arnold City has been home to many coal miners supporting the coal industry in the region.

[5] 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,[6][7] In addition to the Naomi mine, four additional mines operated in the area:[5]