Welcome to Pennsylvania. Northampton County - Photo Pennsylvania welcome highway sign Welcome to Pennsylvania's heritage. Northampton County, PA.From Independence Hall in Philadelphia, to the battlefield at Gettysburg. From the Horseshoe Curve near Altoona, to the Underground Railroad on our side of the Mason-Dixon line. From the coal miners' village of Eckely, to the recreated cities of Pittsburgh and Bethlehem. Northampton County: Established more than 250 years ago in Pennsylvania’s Lehigh Valley. Pennsylvania/New Jersey State Line to Fredericksburg (Junction of I-81)