NOTE: Gray indicates insufficient data or a suppressed estimate.
The Portland metropolitan area in the northwest exhibits the greatest concentration of zip codes with lower U.S. citizenship rates among the adult population, with several zones falling below 85%, likely reflecting established immigrant communities in areas such as east Portland and Woodburn in the Willamette Valley. Eastern Oregon is overwhelmingly yellow, indicating near-universal citizenship rates at or above 95%, consistent with its rural, less demographically diverse profile. Notable outliers include a cluster in south-central Oregon near the Klamath Basin and a zip code along the northeastern border that dip into the 75–80% range, suggesting localized non-citizen populations potentially tied to agricultural labor or tribal land demographics.
Data: U.S. Census Bureau, 2023 ACS
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