Data / Rankings / Population density / Counties in Connecticut

Counties in Connecticut by population density, 2025

Greater Bridgeport Planning Region had the highest population density of 9 counties in 2025, at 930 inhabitants per km². Northwest Hills Planning Region had the lowest, at 56.3 inhabitants per km². The median was 373.6 inhabitants per km² and the figure for Connecticut was 294.1 inhabitants per km². Source: the U.S. Census Bureau.

Highest930Greater Bridgeport Planning Region
Lowest56.3Northwest Hills Planning Region
Median373.69 counties
Connecticut294.1History

All counties, 2025

CSVChart (SVG)

Greater Bridgeport Planning RegionGreater Bridgeport Planning Region: 930 inhabitants per km²930South Central Connecticut Plannin…South Central Connecticut Planning Region: 608.4 inhabitants per km²608.4Western Connecticut Planning Regi…Western Connecticut Planning Region: 464.7 inhabitants per km²464.7Naugatuck Valley Planning RegionNaugatuck Valley Planning Region: 433.4 inhabitants per km²433.4Capitol Planning RegionCapitol Planning Region: 373.6 inhabitants per km²373.6Southeastern Connecticut Planning…Southeastern Connecticut Planning Region: 183.3 inhabitants per km²183.3Lower Connecticut River Valley Pl…Lower Connecticut River Valley Planning Region: 161.4 inhabitants per km²161.4Northeastern Connecticut Planning…Northeastern Connecticut Planning Region: 68.4 inhabitants per km²68.4Northwest Hills Planning RegionNorthwest Hills Planning Region: 56.3 inhabitants per km²56.3
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2025
inhabitants per km²		Change on 2024
1Greater Bridgeport Planning Region930+0.4%
2South Central Connecticut Planning Region608.4+0.2%
3Western Connecticut Planning Region464.7+0.4%
4Naugatuck Valley Planning Region433.4+0.4%
5Capitol Planning Region373.6+0.5%
6Southeastern Connecticut Planning Region183.3+0.3%
7Lower Connecticut River Valley Planning Region161.4+0.1%
8Northeastern Connecticut Planning Region68.4+0.5%
9Northwest Hills Planning Region56.3+0.4%

Other periods

About this ranking

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.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

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

Which county has the highest population density?

Greater Bridgeport Planning Region, with 930 inhabitants per km² in 2025, according to the U.S. Census Bureau.

Which county has the lowest population density?

Northwest Hills Planning Region, with 56.3 inhabitants per km² in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: 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 2026-10-09.

Population density: other rankings

Counties in Connecticut: more rankings