NOTE: Gray indicates insufficient data or a suppressed estimate.
The southern interior of Delaware, particularly in the Sussex County area, contains a prominent cluster of zip codes with notably lower U.S. citizenship rates among adults, dipping below 80%—likely corresponding to agricultural communities around Georgetown and Bridgeville with significant immigrant populations. Northern Delaware, especially the Wilmington metro area, displays considerable variation, with some zip codes reaching near-universal citizenship while adjacent areas in and around the city fall to roughly 85–90%. Coastal and rural Kent County zip codes generally maintain citizenship rates above 95%, forming a consistent band of yellow-green tones along the eastern shore and through the state's midsection.
Data: U.S. Census Bureau, 2023 ACS
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