NOTE: Gray indicates insufficient data or a suppressed estimate.
The suburban zip codes ringing Washington, D.C.—particularly in Prince George's and Montgomery counties—display notably elevated household sizes (3.0–3.5+), likely reflecting larger family households in those high-density suburban corridors. In contrast, the Eastern Shore and the Ocean City area at Maryland's southeastern tip register some of the lowest average household sizes (1.5–2.0), consistent with retirement communities and seasonal housing stock. Western Maryland's Allegany and Garrett counties also trend smaller, while scattered yellow-hued pockets north of Baltimore suggest suburban family enclaves with averages exceeding 3.0.
Data: U.S. Census Bureau, 2023 ACS
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