Sunnyside Unified School District is a growing, dynamic school district which serves more than 16,000 students in Tucson, Arizona, U.S.A. Established in 1921, it is now the third largest district in Pima County. Its boundaries encompass 100 square miles and stretch from southern Tucson to the pecan orchards near Sahuarita, and from Interstate 19 to Wilmot Road. The District also serves part of the San Xavier District of the Tohono O'odham Nation.