U.S. Citizens (% of Population Over 18) by Zip Code (ZCTA5) — Wisconsin

NOTE: Gray indicates insufficient data or a suppressed estimate.

The vast majority of Wisconsin zip codes report U.S. citizenship rates above 95% among the adult population, with near-universal citizenship across the northern and rural portions of the state. Notable concentrations of lower citizenship rates—dropping to 75-85%—appear in the Milwaukee metropolitan area in the southeast, portions of the Madison area in south-central Wisconsin, and a distinct cluster in the west-central region likely corresponding to the La Crosse or Eau Claire areas. A single zip code on the western border stands out with the lowest citizenship percentage on the map, appearing in dark purple at roughly 75% or below.

Data: U.S. Census Bureau, 2023 ACS

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