Pennsylvania Counties by Population (2024)

The most populous counties in Pennsylvania are Philadelphia County with 1,550,542, Allegheny County at 1,224,825, Montgomery County with 868,742, Bucks County at 645,984, and Delaware County with 576,720. You can get the most current Census population data for all 67 Pennsylvania counties, sorted from the most populous counties in Pennsylvania to the least, according to the 2023 Population Estimates Program.

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