NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes with the highest Non-Hispanic American Indian population shares—often exceeding 50% and approaching 100%—cluster prominently across the central-western region of South Dakota, corresponding to the Cheyenne River, Standing Rock, Pine Ridge, and Rosebud reservations, with additional high-concentration areas visible in the northeast near the Sisseton-Wahpeton reservation. The eastern third of the state, particularly the southeastern corridor home to Sioux Falls and surrounding agricultural communities, consistently registers near 0–3%, creating a stark east-west demographic divide. Scattered zip codes in the north-central part of the state display moderate percentages (10–25%), likely reflecting reservation border towns and adjacent communities with mixed populations.
Data: U.S. Census Bureau, 2023 ACS
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