NOTE: Gray indicates insufficient data or a suppressed estimate.
The southwestern corner of Connecticut, encompassing the Stamford and Greenwich area, displays notably lower U.S. citizenship rates among the adult population, with several zip codes falling below 80%, likely reflecting substantial immigrant communities in the Fairfield County coastal corridor. Interior and eastern regions of the state consistently register citizenship rates above 95%, with the highest concentrations of yellow (near 100%) visible across the rural northeast and along the eastern border. Urban centers including Hartford, New Haven, Bridgeport, and Waterbury form a secondary cluster of lower citizenship percentages (roughly 80–90%), contrasting sharply with their surrounding suburban zip codes.
Data: U.S. Census Bureau, 2023 ACS
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