Huntingdon is a borough in and county seat of 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 6,827 at the 2020 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.