NOTE: Gray indicates insufficient data or a suppressed estimate.
The vast majority of Illinois zip codes report U.S. citizenship rates above 95% among the adult population, with nearly uniform yellow coverage across the central and southern portions of the state. A pronounced cluster of lower citizenship rates—dipping to 75–85%—is concentrated in the Chicago metropolitan area, particularly in zip codes on the city's north and west sides, consistent with established immigrant community corridors. Scattered pockets of moderately lower rates (85–92%) also appear around smaller urban centers such as the Champaign-Urbana area, the Quad Cities region, and portions of central Illinois, likely reflecting university communities or localized immigrant populations.
Data: U.S. Census Bureau, 2023 ACS
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