Huntingdon is a borough in Huntingdon County, Pennsylvania, United States. It is located along the Juniata River, approximately 32 miles east of Altoona and 92 miles west of Harrisburg. With a popu…Huntingdon is a borough in Huntingdon County, Pennsylvania, United States. It is located along the Juniata River, approximately 32 miles east of Altoona and 92 miles west of Harrisburg. With a population of 7,093 at the 2010 census, it is the largest population center near Raystown Lake, a winding, 28-mile-long flood-control reservoir managed by the U.S. Army Corps of Engineers.