NOTE: Gray indicates insufficient data or a suppressed estimate.
The lowest U.S. citizenship rates among adults concentrate in the urban core—particularly in Boston's Chinatown/Downtown, East Boston, and parts of Lynn—where percentages drop below 80%, likely reflecting dense immigrant communities. Outer suburban zip codes to the northwest and southwest consistently exceed 95% citizenship, creating a pronounced core-periphery gradient. Quincy stands out as a secondary pocket of lower citizenship rates south of Boston, contrasting sharply with neighboring Weymouth Town's higher values.
Data: U.S. Census Bureau, 2023 ACS
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