Data / Population density / Philadelphia County

Population density in Philadelphia County

Population density in Philadelphia County was 4,525.1 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.1% from 2024. That is the 1st highest of 67 counties in 2025.

2025, inhabitants per km²4,525.1
Change on 2024+0.1%
Rank1st of 67Counties in Pennsylvania ranked
Series high4,601.12020
Series low4,500.82023

Population density in Philadelphia County, 2020 to 2025

CSVChart (SVG)

4,5004,5254,5504,5754,6004,6252020202120222023202420252020: 4,601.1 inhabitants per km²2021: 4,570.9 inhabitants per km²2022: 4,519.5 inhabitants per km²2023: 4,500.8 inhabitants per km²2024: 4,520.6 inhabitants per km²2025: 4,525.1 inhabitants per km²
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09, published 2026-03-26.
All 6 values
Periodinhabitants per km²
20254,525.1
20244,520.6
20234,500.8
20224,519.5
20214,570.9
20204,601.1

Compared with Pennsylvania and United States

Place2025
Philadelphia County4,525.1
Pennsylvania112.7
United States37.3

Rankings

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

What is the population density in Philadelphia County?

Population density in Philadelphia County was 4,525.1 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.1% from 2024. That is the 1st highest of 67 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved by Invokely on 2026-10-09.

What was the highest population density in Philadelphia County?

4,601.1 inhabitants per km² in 2020, the highest value since 2020 in this series.

More statistics for Philadelphia County

All statistics for Philadelphia County