NOTE: Gray indicates insufficient data or a suppressed estimate.
The vast majority of New Hampshire zip codes report U.S. citizenship rates above 95% among their adult populations, with nearly uniform yellow shading across the central and northern regions of the state. A notable cluster of lower citizenship rates, indicated by green shading in the 85–93% range, appears in the southern tier and along parts of the southeastern border, likely corresponding to more urbanized areas such as Manchester, Nashua, and the Seacoast region that attract higher concentrations of foreign-born residents. A few isolated zip codes in the far north also display slightly lower rates, possibly reflecting smaller populations where even modest numbers of non-citizens shift the percentage noticeably.
Data: U.S. Census Bureau, 2023 ACS
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