The Phoenix Union High School District is a school district in Phoenix, Arizona, United States. It is one of the state's oldest school districts and its largest high school-only district, serving 27,031 students in 16 schools and employing nearly 3,000 people. Areas served by the district mostly include central Phoenix, south Phoenix, and Laveen; a variety of other school districts serve the remaining areas of the city. The district has 13 different elementary school districts which feed into its service area. It is also one of the most diverse districts in the state; over 60 languages are represented, and more than half of district students come from residences where English is not the primary language.