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Many of the top richest places in Pennsylvania are suburbs of Pittsburgh, located in Allegheny County, and the suburbs of Harrisburg, which include Cumberland and Dauphin counties. However, the overall richest area is the Delaware Valley, which is composed of suburban Philadelphia, and is located in a wealth corridor that runs from the suburbs of Washington, DC all the way into southern New Hampshire.How many counties in Pennsylvania?
Today, Pennsylvania is divided into 67 counties. States bordering Pennsylvania are New York, New Jersey, Delaware, Maryland, Ohio and West Virginia. Pennsylvania has no counties that are lost, defunct or extinct.