 Pennsylvania's 10th congressional district, located in central and northeastern Pennsylvania, includes Bradford County, Juniata County, Lycoming County, Mifflin County, Pike County, Snyder County, Sullivan County, Susquehanna County, Union County, Wayne County, and portions of Perry County, Tioga County, Lackawanna County, Monroe County, and Northumberland County.In 2010, Marino decided to challenge incumbent Democratic U.S.Congressman Chris Carney of Pennsylvania's 10th congressional district.