UNIFIED SCHOOL DISTRICT

A 'unified school district' is a school district which includes both primary school (kindergarten through middle school or junior high) and high school (grades 9-12). In Illinois, these districts are called 'unit school districts'.
This distinction exists primarily in Illinois and western U.S. states, where elementary school districts and high school districts can be separate. The Los Angeles Unified School District (sometimes called "LA Unified") is a major example of a California unified school district.
Unified school districts are not to be confused with union school districts, which are usually formed by the consolidation of multiple school districts of the same type.