Household Average Size by Zip Code (ZCTA5) — Connecticut

NOTE: Gray indicates insufficient data or a suppressed estimate.

Larger household sizes (3.0+) cluster in suburban and exurban zip codes across Fairfield County's interior and parts of the upper Connecticut River valley, consistent with family-oriented communities with higher homeownership rates. In contrast, the smallest average household sizes (below 2.0) concentrate in urban cores—particularly visible in New Haven, Hartford, and several smaller city centers—where higher shares of single-person households and rental housing typically prevail. A notable east-west gradient emerges in the southern coastal corridor, with southwestern zip codes near Stamford and Greenwich trending larger than their counterparts along the central and eastern shoreline.

Data: U.S. Census Bureau, 2023 ACS

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