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

NOTE: Gray indicates insufficient data or a suppressed estimate.

Central Washington's agricultural regions, particularly the Yakima Valley and portions of the Columbia Basin, display notably lower U.S. citizenship rates among adults, with several zip codes falling below 80%, likely reflecting substantial immigrant farmworker populations. Eastern Washington's rural zip codes consistently show citizenship rates at or near 100%, forming a stark contrast with the central corridor. The Seattle-Tacoma metropolitan area presents a mixed pattern, with some urban zip codes—particularly in south King County and parts of Tacoma—dipping below 85%, while surrounding suburban areas generally maintain rates above 90%.

Data: U.S. Census Bureau, 2023 ACS

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