NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes along the Texas-Mexico border—particularly in the Rio Grande Valley and the El Paso area—display the lowest U.S. citizenship rates among adults, frequently falling below 80%, reflecting the high concentration of non-citizen immigrant populations in these border communities. The rural Panhandle, East Texas, and much of the central Hill Country trend strongly toward 95–100% citizenship, consistent with predominantly native-born populations in less urbanized areas. Major metropolitan cores such as Dallas-Fort Worth, Houston, and San Antonio exhibit notable internal variation, with certain inner-city and suburban zip codes dropping into the 80–85% range while surrounding areas maintain higher rates, suggesting localized clusters of foreign-born non-citizen residents within these metros.
Data: U.S. Census Bureau, 2023 ACS
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