Exhibit # 21 Subsidiaries of the Registrant Mountainview Thoroughbred Racing Association Pennsylvania National Turf Club, Inc. Penn National Speedway, Inc. Sterling Aviation, Inc. Penn National Holding Company Penn National Gaming Of West Virginia, Inc. Penn National Gaming Of Indiana, Inc. PNGI Pocono, Inc. The Plains Company Pocono Downs, Inc. Northeast Concessions, Inc. Audio Video Concepts, Inc. Backside, Inc. The Downs Off-Track Wagering, Inc. Mill Creek Land, Inc. PNGI Charles Town Gaming, Limited Liability Company (80% owned) 103