NOTE: Gray indicates insufficient data or a suppressed estimate.
Married-couple households concentrate most heavily in the outer northern and northwestern suburbs, where several zip codes exceed 70–80%, while Baltimore City's core zip codes consistently fall below 30%, creating a stark urban-suburban divide. Ellicott City and Columbia in Howard County maintain moderately high rates in the 50–65% range, forming a secondary cluster of married-couple households to the southwest. The eastern and southeastern portions of the metro display more variability, with pockets of higher rates adjacent to zip codes dropping sharply near the city boundary.
Data: U.S. Census Bureau, 2023 ACS
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