NOTE: Gray indicates insufficient data or a suppressed estimate.
Larger average household sizes of 3.0 or above concentrate in southeastern Pennsylvania—particularly in suburban and exurban areas surrounding Philadelphia—as well as in scattered rural pockets of the northwest, likely reflecting communities with younger families or multigenerational living arrangements. Central Pennsylvania's university towns and Pittsburgh's urban core display notably lower averages, often falling below 2.0, consistent with high concentrations of student housing and single-occupant units. The south-central corridor running through Lancaster County stands out with elevated household sizes, aligning with the region's significant Amish and Mennonite populations.
Data: U.S. Census Bureau, 2023 ACS
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