NOTE: Gray indicates insufficient data or a suppressed estimate.
The Chicago metropolitan area's North Shore and western suburbs display the highest concentrations of bachelor's degree attainment, with numerous zip codes exceeding 50%, while zip codes on Chicago's south and west sides fall below 10%, creating one of the sharpest educational attainment gradients in the state. Downstate urban centers such as Champaign-Urbana, Springfield, and Bloomington-Normal appear as isolated pockets of higher attainment (30–50%) surrounded by rural zip codes that generally range between 10–20%. Southern Illinois consistently registers the lowest educational attainment levels statewide, with broad swaths of zip codes in the sub-15% range, particularly in the region south of Interstate 64.
Data: U.S. Census Bureau, 2023 ACS
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