This study investigates how much the geographic shapes of school attendance zones contributes to their levels of income segregation while holding constant levels of income segregation across residential areas. Income segregation across attendance zones is measured with the rank ordered information theory index. Income segregation across residential areas is measured using a spatial variant of segregation (newly developed to predict income segregation in school attendance zones). Findings indicate income segregation across residential areas is highly correlated with income segregation across attendance zones. Still, school districts with the most irregularly shaped zones have less income segregation than school districts with compact zones--net of residential income segregation.