what county is hadley pa
Hadley (in Mercer County, PA) Populated Place Profile. Hadley (GNIS FID: 1199876) is a populated place located within the Township of Perry, a minor civil division (MCD) of Mercer County. The elevation of Hadley is 1,060 feet. Hadley appears on the Hadley U.S. Geological Survey Map. Mercer County is in the Eastern Time Zone (UTC -5 hours).