Household Average Size by Zip Code (ZCTA5) — Seattle Metro

NOTE: Gray indicates insufficient data or a suppressed estimate.

Household sizes in the Seattle metro follow a clear urban-suburban gradient, with the smallest averages (1.5–2.0) concentrated in downtown Seattle and adjacent neighborhoods like Capitol Hill and the University District, reflecting the dominance of single-person and couple households in dense apartment-heavy zip codes. Suburban and exurban areas to the northeast—particularly around Redmond, Kirkland, and the eastern fringe—exhibit notably larger household sizes (3.0–3.5+), consistent with family-oriented single-family housing stock. A similar pattern emerges south of Seattle, where outer zip codes near Kent and south of Tacoma trend larger, while Tacoma's urban core and waterfront zones mirror Seattle's lower averages.

Data: U.S. Census Bureau, 2023 ACS

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