NOTE: Gray indicates insufficient data or a suppressed estimate.
The vast majority of South Carolina zip codes report U.S. citizenship rates above 95% among the adult population, with the highest concentrations of near-100% citizenship spanning rural areas of the Pee Dee region, the Midlands, and the upstate interior. Notable exceptions cluster around the southern coastal zone near Hilton Head and Beaufort, where several zip codes drop below 80%, likely reflecting significant immigrant and seasonal worker populations in the resort and agricultural sectors. A secondary band of moderately lower citizenship rates (85–92%) appears in the Greenville-Spartanburg upstate corridor and portions of the Columbia metropolitan area, consistent with urban centers that attract larger foreign-born populations.
Data: U.S. Census Bureau, 2023 ACS
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