The famous person Henry Clay Frick is associated with one of more of the Westmoreland County historic places.
Some of the country's most noteable architects helped create the Westmoreland County places including Thomas Tressler, Abraham Overholt, Olmstead, Frederick Law, Firm, J.A. Truxall, Ralph Adams Cram, J.C. Fulton, S.J. Zearly, Robert Bowers, Cookman, William H., et al. and J. F. McWilliams. Prominent architectural styles found in Westmoreland Country are Italianate, Colonial Revival and Greek Revival.