Hadley is an unincorporated community in Mercer County, Pennsylvania, United States. The community is located along Pennsylvania Route 358 12.9 miles north of Mercer. Hadley has a post office with ZIP code 16130.David Hadley came to Perry Township in 1843. He was a shoemaker by trade, but with his family took such an active part in clearing his lands and building mills that when the Lake Shore Railroad was built across the township and a station erected... Show more

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