Data / Population density / Suffolk County

Population density in Suffolk County

Population density in Suffolk County was 655.3 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.2% from 2024. That is the 9th highest of 62 counties in 2025.

2025, inhabitants per km²655.3
Change on 2024+0.2%
Rank9th of 62Counties in New York ranked
Series high655.32025
Series low645.12020

Population density in Suffolk County, 2020 to 2025

CSVChart (SVG)

6456486506536556582020202120222023202420252020: 645.1 inhabitants per km²2021: 650.1 inhabitants per km²2022: 649.3 inhabitants per km²2023: 649.9 inhabitants per km²2024: 654.2 inhabitants per km²2025: 655.3 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
2025655.3
2024654.2
2023649.9
2022649.3
2021650.1
2020645.1

Compared with New York and United States

Place2025
Suffolk County655.3
New York163.9
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 Suffolk County?

Population density in Suffolk County was 655.3 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.2% from 2024. That is the 9th highest of 62 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 Suffolk County?

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

More statistics for Suffolk County

All statistics for Suffolk County