NOTE: Gray indicates insufficient data or a suppressed estimate.
The highest uninsured rates in Illinois, exceeding 25–50%, concentrate in a distinct cluster around the central part of the state near Champaign-Urbana and in portions of the southern region, likely reflecting areas with significant immigrant or college-age populations. The Chicago metropolitan area in the northeast displays considerable variation, with some zip codes in the low single digits adjacent to others exceeding 15–20%, suggesting sharp disparities across neighborhood lines. Rural zip codes throughout western and southern Illinois generally fall in the 5–10% range, while many suburban collar-county zip codes around Chicago consistently register among the lowest uninsured rates statewide.
Data: U.S. Census Bureau, 2023 ACS
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