Southwestern Academy is a nonprofit, coeducational college preparatory school for grades 6-12, with two campuses—one in San Marino, California, and the other in Rimrock, Arizona, USA. The school is accredited by WASC (Western Association of Schools and Colleges). The school offers boarding and day enrollment for 145 students for grades 6-12 in San Marino and 40 students for grades 9-12 at the Rimrock campus. A year of postgraduate studies is offered at both campuses. Students can transfer between the two campuses.