NOTE: Gray indicates insufficient data or a suppressed estimate.
The vast majority of Iowa zip codes report U.S. citizenship rates above 95% among the adult population, with nearly uniform yellow coverage across the eastern, southern, and rural western portions of the state. Notable clusters of lower citizenship rates (80–90%) appear in north-central Iowa—particularly around the Storm Lake and Marshalltown areas—as well as scattered zip codes near Des Moines, Waterloo, and the southeastern corner, likely corresponding to communities with larger immigrant populations tied to meatpacking and agricultural industries. A few zip codes dip below 75%, most prominently one in the northwest quadrant near Storm Lake, representing the starkest contrast against the otherwise overwhelmingly high citizenship rates statewide.
Data: U.S. Census Bureau, 2023 ACS
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