NOTE: Gray indicates insufficient data or a suppressed estimate.
The Chicago suburban collar counties—particularly the North Shore and western DuPage County—display the highest median household incomes in the state, with numerous zip codes exceeding $125,000, while zip codes within Chicago's South and West sides show stark contrasts, dipping below $30,000 in some areas. Central Illinois exhibits a patchwork pattern where zip codes anchored by mid-sized cities like Peoria, Springfield, and Champaign tend toward moderate incomes ($50,000–$70,000), surrounded by rural areas with generally lower earnings. Southern Illinois consistently registers among the lowest median incomes statewide, with concentrations of deep purple zip codes below $30,000 clustered in the Cairo region and along the southeastern border counties.
Data: U.S. Census Bureau, 2023 ACS
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