NOTE: Gray indicates insufficient data or a suppressed estimate.
The vast majority of Maine's zip codes report U.S. citizenship rates above 95% among the adult population, with near-universal citizenship (approaching 100%) across much of the interior and northern regions. Notable exceptions appear in a few scattered coastal and southern zip codes, as well as a cluster in the eastern central area near the coast, where rates dip into the 85–90% range, likely corresponding to areas with immigrant or refugee populations such as the Portland and Lewiston metro areas. The large gray (no-data) zones in the sparsely populated northwestern interior reflect unincorporated territories with insufficient population for ZCTA-level reporting.
Data: U.S. Census Bureau, 2023 ACS
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