The Hillsboro School District 1J is a unified school district located in Hillsboro, Oregon, United States. The district operates 26 elementary schools, four middle schools, and four high schools. Founded in 1851, the school district covers Hillsboro, Scholls, Reedville, North Plains, West Union, and other area communities. Total enrollment as of the 2014-2015 school year is 20,884 students, fourth largest in the state.