ABOUT MT. SACMt. San Antonio College is among the largest of California's 112 community colleges. Located in the city of Walnut, Mt. SAC serves nearly 20 communities and a million residents in the bustling San Gabriel Valley. Since the College opened its doors in 1946, Mt. SAC has provided quality and affordable educational opportunities to more than a million students of all ages. Today, the College offers more than 200 degree and certificate programs and has earned statewide and national distinction in a number of disciplines. Our alumni have distinguished themselves in both the private and public sectors.Here you can learn more about Mt. SAC, its history, mission, the College leadership and administration, and major departments as well as the College's financial profile and statistics about the campus, students, staff, and research results.