How many people live in ?

Updated annually
In 2025, there were 13.1 million people living in Pennsylvania. That makes Pennsylvania the fifth-most populous state, home to 3.8% of people living in the US.

13.1M

population of Pennsylvania (2025)

3.8%

Pennsylvania share of the US population (2025)
The population of Pennsylvania was about 2.1 times higher than it was in 1900. Between 2024 and 2025, the population of Pennsylvania grew by about 13,600 people.

About 13.1 million people lived in Pennsylvania in 2025. That's about 2.1 times more than in 1900.

Annual population estimates

What are Pennsylvania's age demographics?

About 2.67 million Pennsylvania residents were aged 65 and older in 2024. That represents 20.4% of the state’s population compared with 18% in the US overall.
Another 2.63 million Pennsylvania residents, or 20.1% of the state’s population, were aged under 18. For comparison, children account for 21.6% of the US population.

A higher share of Pennsylvania's population is is 65 and older than the US overall.

Population share by age group (2024)

What are Pennsylvania's racial and ethnic demographics?

A state’s population may have racial and ethnic differences compared with the US overall. These figures reflect how people identified their race alone (not in combination with other races), and separate Hispanic or Latino ethnicity, following Census Bureau reporting standards.
Non-Hispanic white residents make up 73.4% of Pennsylvania’s population, higher than the national share of 57.5%.
In contrast, Pennsylvania’s Hispanic population accounted for 9.5%, below the 20% share nationwide. The non-Hispanic Asian population makes up 4.4% of the state, compared with 6.5% nationally.

A higher share of Pennsylvania's population is is non-Hispanic white than the US overall.

Population share by race and ethnicity (2024)

What are Pennsylvania's most populous counties?

In 2024, nine out of 67 counties accounted for over half of Pennsylvania’s population:
  • Philadelphia County, 1.57 million (12.1% of the population)
  • Allegheny County, 1.23 million (9.4%)
  • Montgomery County, 879,200 (6.7%)
  • Bucks County, 650,100 (5%)
  • Delaware County, 584,900 (4.5%)
  • Lancaster County, 563,300 (4.3%)
  • Chester County, 560,700 (4.3%)
  • York County, 471,200 (3.6%)
  • Berks County, 439,100 (3.4%)

In 2024, Philadelphia County was the most populous county in Pennsylvania.

Population estimates

What are Pennsylvania's most populous cities?

The largest city in Pennsylvania is Philadelphia with about 1.57 million residents in 2024.

Cities and counties in Pennsylvania ranked by population

Cities and counties in Pennsylvania ranked by population
1.

Philadelphia 

1,573,916
2.

Pittsburgh 

307,668
3.

Allentown 

127,138
4.

Reading 

96,000
5.

Erie 

92,940
6.

Bethlehem 

79,453
7.

Scranton 

75,905
8.

Lancaster 

58,441
9.

Harrisburg 

50,649
10.

York 

45,241

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Methodology

USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.

The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.

Page sources

USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.