NOTE: Gray indicates insufficient data or a suppressed estimate.
The vast majority of Montana zip codes report U.S. citizenship rates above 95% among the adult population, with nearly uniform yellow shading across the central and eastern plains. Notable exceptions cluster in the western part of the state—particularly around Flathead Lake, Missoula, and Bozeman areas—where several zip codes dip into the 85–93% range, likely reflecting university communities and agricultural labor markets. A small number of outliers fall below 80%, including a conspicuous dark-shaded zip code along the south-central border and another in the northeastern region near what appears to be the Sidney/Williston Basin area, potentially tied to oil industry workforce migration.
Data: U.S. Census Bureau, 2023 ACS
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