Keystone School District
 The Keystone School District is a small rural public school district in Clarion County Pennsylvania. It serves the boroughs of Shippenville Knox and Callensburg as well as the townships of Beaver Township Elk Township Licking Township Ashland Township and Salem Township. The Keystone School District encompasses approximately 126 square miles. According to 2000 federal census data it serves a resident population of 7589.