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By Pennsylvania Census Statistics
The PA State Data Center 

Pennsylvania Gains Population in Urban Areas


August 19, 2021

Trends in Pennsylvania's Population by Age

Pa.'s older population cohorts continued to grow from 2010 to 2020 (chart above). The population age 65 to 69 and age 70 to 74 were the fastest growing cohorts (40.1 percent and 46.9 percent, respectively). Pennsylvania also experienced notable growth in its young adult population in the age 25 to 29 and age 30 to 34 cohorts (7.9 percent and 18.3 percent, respectively). Overall, the population under 25 years of age decreased by more than 310,000 persons (minus 7.7 percent), while the population 25 to 64 years of age decreased by just over 97,000 (minus 1.5 percent). The population over 65 years of age added over 488,000 persons and increased by 24.9 percent.

Pennsylvania grew by 2.4 percent over the last decade. Between 2010 and 2020, Pennsylvania's population grew from 12,702,379 to 13,002,700, an increase of 300,321 or 2.4 percent. Over this same period, 44 Pennsylvania counties lost population and 23 grew. Philadelphia County is still the largest county in the state.

Philadelphia County is the most populous county in Pennsylvania, with a 2020 Census population of 1,603,797, an increase of 5.1 percent since 2010. The second-largest county remains Allegheny County with 1,250,578 people, an increase of 2.2 percent since 2010. The five largest...

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