NOTE: Gray indicates insufficient data or a suppressed estimate.
The Greater Boston metro area exhibits the lowest U.S. citizenship rates among adults, with several zip codes in and around Boston, Cambridge, and surrounding communities falling below 85%, likely reflecting concentrations of immigrant populations in urban centers. Western and central Massachusetts zip codes consistently display citizenship rates at or near 100%, with the yellow-dominant landscape indicating highly native-born populations across rural and suburban areas. Notable pockets of lower citizenship rates also appear in select southeastern Massachusetts communities near New Bedford and on parts of Cape Cod, as well as a few scattered zip codes in the Pioneer Valley and Worcester County.
Data: U.S. Census Bureau, 2023 ACS
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