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2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the 2000 U.S. Census secondary school district boundaries in Illinois. Secondary school districts provide educati... U.S. Census Bureau. Geography Division.
2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the unified school district boundaries in Illinois. School districts are geographic entities within which state, ... U.S. Census Bureau. Geography Division.