NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes in the western part of South Dakota, particularly those overlapping tribal reservation lands such as Pine Ridge and Rosebud, display notably elevated uninsured rates reaching 25–50%, forming a distinct cluster of health coverage gaps. The eastern portion of the state, especially around the Sioux Falls metropolitan area, generally exhibits lower uninsured rates in the 5–10% range, though scattered rural zip codes throughout the central and eastern regions still show pockets of 15–20% uninsured populations. A substantial number of gray (no-data) zip codes are concentrated in sparsely populated areas of central and western South Dakota, likely reflecting low population thresholds that suppress reliable estimates.
Data: U.S. Census Bureau, 2023 ACS
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