NOTE: Gray indicates insufficient data or a suppressed estimate.
Central Portland zip codes exhibit the smallest average household sizes in the metro area, dropping to approximately 1.5 persons per household in the downtown core and inner Northwest/Southwest neighborhoods, consistent with high concentrations of apartments and single-occupant units. Household sizes increase substantially moving outward, with the largest averages (approaching 3.0–3.5) found in the southern periphery, the Hillsboro corridor to the west, and a notably high-value cluster southeast of Gresham, areas typically characterized by newer suburban single-family development. Vancouver and the northern reaches of the metro also trend toward moderately larger households (2.6–3.0), while Beaverton, Lake Oswego, and inner East Portland occupy a middle band, reflecting a mix of housing types and demographic compositions.
Data: U.S. Census Bureau, 2023 ACS
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