Sonic Corp. operates and franchises a chain of quick-service drive-in restaurants in the United States. As of August 31, 2017, the company operated 3,593 Sonic Drive-Ins in 45 states, of which 228 were owned and operated by the company and 3,365 were owned and operated by franchisees. The company also owns and leases 135 properties; and sublease 53 properties to franchisees and other parties. The company was founded in 1953 and is headquartered in Oklahoma City, Oklahoma.