Arnold is a city in Westmoreland County, Pennsylvania, United States. It is part of the Greater Pittsburgh metropolitan area. The population was …Arnold is a city in Westmoreland County, Pennsylvania, United States. It is part of the Greater Pittsburgh metropolitan area. The population was 5,157 at the 2010 census. Present-day Westmoreland County was part of the hunting reserves of the Iroquois Indians. White colonists began to penetrate the area in the 1750s, and circa 1781 Robert McCrea purchased the land on which Arnold is situated. William Jack acquired the property and later passed it on to Wilson Jack. The area around Arnold was first settled in 1852 by Major Andrew Arnold, who grew up in Kittanning.
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