Poston Butte High School is located in San Tan Valley, an unincorporated area of Pinal County. San Tan Valley is serviced by three unified school districts: Florence, J. O. Combs, and Coolidge. Poston Butte is part of the Florence Unified School District. The district is geographically large and divided into two distinct areas: the greater Florence area and the more highly populated Hunt Highway corridor. PBHS is located in the Hunt Highway area and is 20.4 miles from Florence High School and the Florence USD district offices.