Noncontiguous school attendance zone boundaries (AZBs) have a unique, relatively uncommon shape that assign two or more non-adjacent residential areas to the same school. Given their ability to shape school enrollments by taking advantage of residential sorting, noncontiguous AZBs have historically been linked to explicit efforts to both segregate…

Public elementary and secondary schools in Illinois that have remained stably racially mixed over time are identified in this study. The neighborhood characteristics, pupil assignment policies, instructional programs, and other circumstances that have contributed to that stability are also determined. Several alternative definitions of…