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Authors find that the typical school attendance zone is relatively compact and resembles a square-like shape. Compact zones typically draw children from local residential areas, and since local areas are often racially homogeneous, this suggests that high levels of racial segregation in the largest school districts are largely structured by existing residential segregation.
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Although relatively rare, attendance zones that are highly irregular in shape almost always contain racially diverse student populations. This racial diversity contributes to racial integration within school districts. These findings contradict recent theoretical and empirical scholarship arguing that irregularly shaped zones contribute to racial segregation in schools.
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Their findings suggest that most racial segregation in school attendance zones is driven by large-scale segregation across residential areas rather than a widespread practice among school districts to exacerbate racial segregation by delineating irregularly shaped attendance zones.
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Their findings show that to a large degree racial segregation in public elementary schools is driven by residential segregation coupled with compact zoning practices.
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There is far less variation in racial diversity among highly irregular zones and the over-whelming majority of the most irregularly shaped zones are racially diverse. By contrast, compact zones are, on average, less racially diverse than irregular zones. But compact zones also contain the full range of diversity scores.
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As attendance zones become more irregular, it is more likely that children from different racial groups within them live in more spatially and racially distinct clumps. By contrast, compact zones are more likely to contain students of different racial groups who are interspersed in some-what of a checkboard fashion.
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The findings show that the more irregular in shape a zone is, the more likely it is to contain a racially diverse population and that irregular zones often achieve this desegregation by drawing children from distinct racial enclaves.
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One implication of their findings is that racially diverse school districts that want to delineate irregular zones to achieve racial integration must go to extraordinary lengths to achieve this end.