NOTE: Gray indicates insufficient data or a suppressed estimate.
The southeastern corner of Pennsylvania, encompassing the Philadelphia metropolitan area, displays stark contrasts with pockets of very low median ages (under 25, likely corresponding to university areas like University City and State College in the center of the state) adjacent to suburban zip codes with median ages well above 45. Rural northern-tier counties and areas along the Allegheny Plateau generally trend older, with median ages in the 45–55 range, while the Pittsburgh metro region in the southwest shows a mixed pattern of younger urban cores surrounded by aging suburban and exurban communities. A notable band of younger-skewing zip codes extends across the south-central part of the state, potentially reflecting younger family-oriented communities in the Lancaster, York, and Cumberland County corridors.
Data: U.S. Census Bureau, 2023 ACS
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