Huntingdon is a borough in and county seat of Huntingdon County, Pennsylvania, United States. It lies along the Juniata River about 32 miles (51 km) east of larger Altoona and 92 miles (148 km) west of the state capital of Harrisburg on the Susquehanna River. With a population of 6,827 in the 2020 U.S. Decennial Census, it is the largest population center near Raystown Lake, a winding, 28-mile-long (45 km) flood-control reservoir managed by the United States Army Corps of Engineers.