NOTE: Gray indicates insufficient data or a suppressed estimate.
Married-couple households concentrate most heavily in the outer suburban ring, with zip codes in the Naperville–Bolingbrook corridor and north-northwest suburbs near Palatine routinely exceeding 60–70% of all households. A stark contrast emerges in Chicago's south side neighborhoods—particularly Englewood and surrounding areas—and in Gary, Indiana, where married-couple shares drop below 20–30%, forming a contiguous cluster of deeply purple zip codes. The urban core around The Loop and near-north lakefront also registers notably lower rates than the surrounding suburbs, though not as extreme as the south side, suggesting both income and housing-type dynamics shape the spatial gradient.
Data: U.S. Census Bureau, 2023 ACS
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