NOTE: Gray indicates insufficient data or a suppressed estimate.
Suburban zip codes south and west of Boston—particularly in the MetroWest corridor and communities like those in Norfolk and Middlesex counties—consistently display higher average household sizes in the 2.8–3.2 range, reflecting family-oriented residential areas. In contrast, the western portion of the state, including the Berkshires and Pioneer Valley college towns, skews notably lower at 2.0–2.4, as does Provincetown at the tip of Cape Cod, which registers among the smallest averages statewide. A handful of zip codes in the Greater Boston core and Nantucket fall below 1.8, likely driven by concentrations of single-person households, student populations, or seasonal housing stock.
Data: U.S. Census Bureau, 2023 ACS
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