NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes in the outer suburban ring—particularly in western Chester County, upper Bucks County, and southern Delaware County—consistently display U.S. citizenship rates above 95%, reflecting established, predominantly native-born communities. In contrast, a distinct corridor of lower citizenship rates (75–85%) runs through central Philadelphia, parts of Camden, and several zip codes near Trenton, aligning with areas known for larger immigrant populations. Notably, a few isolated zip codes in the northern suburbs near Norristown and Lansdale also dip into the mid-80s range, suggesting pockets of foreign-born residents outside the urban core.
Data: U.S. Census Bureau, 2023 ACS
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