NOTE: Gray indicates insufficient data or a suppressed estimate.
The Philadelphia metro area exhibits a clear urban-suburban age gradient, with the youngest median ages (under 25) concentrated in zip codes near central Philadelphia, Camden, and Chester—areas likely influenced by university populations and younger urban demographics. Suburban zip codes in the outer ring, particularly to the northwest and north toward Bucks County, skew considerably older with median ages reaching into the mid-40s to upper 50s, while one zip code north of Norristown stands out with a median age exceeding 60. King of Prussia and the western Montgomery County corridor display moderate median ages in the 38–45 range, forming a transitional band between the younger urban core and the older exurban periphery.
Data: U.S. Census Bureau, 2023 ACS
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