NOTE: Gray indicates insufficient data or a suppressed estimate.
The lowest U.S. citizenship rates among adults concentrate heavily in the Washington, D.C. suburban corridor of Montgomery and Prince George's counties, where several zip codes fall below 80%, reflecting the region's large immigrant communities. A secondary cluster of lower citizenship rates appears on the lower Eastern Shore near Salisbury, likely tied to agricultural workforce demographics. By contrast, western Maryland, the upper Eastern Shore, and southern Maryland's rural zip codes consistently exceed 95%, highlighting a sharp urban-suburban versus rural divide in foreign-born population concentration.
Data: U.S. Census Bureau, 2023 ACS
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