NOTE: Gray indicates insufficient data or a suppressed estimate.
The Denver metropolitan area exhibits the most pronounced variation in U.S. citizenship rates, with several zip codes in the central urban core and Aurora dropping below 80%, contrasting sharply with surrounding suburban areas that maintain rates above 95%. Western Colorado's mountain communities, particularly around the ski resort corridors and agricultural valleys near Gunnison and the Roaring Fork area, display notably lower citizenship percentages in the 85–90% range, likely reflecting immigrant workforce populations. Rural eastern plains zip codes and southern Colorado outside of Pueblo consistently register at or near 100%, forming a broad yellow band across the less densely populated portions of the state.
Data: U.S. Census Bureau, 2023 ACS
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