NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes in the San Francisco Bay Area and parts of the Los Angeles Basin display notably lower U.S. citizenship rates among adults, with several clusters falling below 80%, reflecting areas with significant immigrant populations. Rural and inland regions—particularly in the northern Sacramento Valley, Sierra Nevada foothills, and eastern desert areas—consistently register citizenship rates above 95%, appearing in bright yellow. The Central Valley presents a striking patchwork, with agricultural communities in the San Joaquin and Salinas valleys showing some of the lowest percentages statewide, often adjacent to higher-rate zip codes just a few miles away.
Data: U.S. Census Bureau, 2023 ACS
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