NOTE: Gray indicates insufficient data or a suppressed estimate.
Zip codes in the southwestern portion of South Dakota, particularly around the Pine Ridge and Rosebud reservation areas, display notably higher average household sizes exceeding 3.0, consistent with larger multigenerational households common in Native American communities. Urban centers such as Sioux Falls in the southeast and Rapid City in the west tend toward moderate values around 2.2–2.6, while scattered small-town and rural zip codes across the central and northern tiers show considerable variability, with some of the lowest values (below 1.8) likely reflecting aging populations or college-town demographics. The starkest contrasts appear in the west, where adjacent zip codes can differ by more than a full person per household, underscoring the demographic heterogeneity driven by reservation boundaries and rural settlement patterns.
Data: U.S. Census Bureau, 2023 ACS
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