NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes in the western and southwestern portions of the metro, particularly around Ellicott City and Columbia in Howard County, display notably lower U.S. citizenship rates among adults (roughly 80–85%), likely reflecting larger immigrant communities in those areas. In contrast, many zip codes in the northern and northeastern periphery consistently reach 95–100%, suggesting predominantly native-born populations. Within Baltimore City itself, citizenship rates vary sharply by neighborhood, with several central and southern zip codes showing higher rates (yellow) adjacent to areas with markedly lower percentages, indicating significant demographic heterogeneity at a fine geographic scale.
Data: U.S. Census Bureau, 2023 ACS
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