About Sonic: Sonic Drive-In, more commonly known as Sonic, is an American drive-in fast-food restaurant chain based in Oklahoma City, Oklahoma. As of September 5, 2017, there are 3,557 Sonic restaurants in 45 U.S. states. It was founded in 1953. Although Sonic has operated since the early 1950s, Sonic Corp. incorporated in Delaware in 1978. It has its corporate headquarters in Oklahoma City; the headquarters […]