Data / Population density / Arlington County

Population density in Arlington County

Population density in Arlington County was 3,622.8 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 1.8% from 2024. That is the 2nd highest of 133 counties in 2025.

2025, inhabitants per km²3,622.8
Change on 2024+1.8%
Rank2nd of 133Counties in Virginia ranked
Series high3,622.82025
Series low3,467.52022

Population density in Arlington County, 2020 to 2025

CSVChart (SVG)

3,4503,5003,5503,6003,6502020202120222023202420252020: 3,546.9 inhabitants per km²2021: 3,467.6 inhabitants per km²2022: 3,467.5 inhabitants per km²2023: 3,480.7 inhabitants per km²2024: 3,559.7 inhabitants per km²2025: 3,622.8 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
20253,622.8
20243,559.7
20233,480.7
20223,467.5
20213,467.6
20203,546.9

Compared with Virginia and United States

Place2025
Arlington County3,622.8
Virginia86.8
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 Arlington County?

Population density in Arlington County was 3,622.8 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 1.8% from 2024. That is the 2nd highest of 133 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 Arlington County?

3,622.8 inhabitants per km² in 2025, the highest value since 2020 in this series.

More statistics for Arlington County

All statistics for Arlington County