Data / Rankings / Population / Counties in Connecticut

Counties in Connecticut by population

Capitol Planning Region had the highest population of 9 counties in 2022, at 975,074. Northeastern Connecticut Planning Region had the lowest, at 96,121. The median was 328,996 and the figure for Connecticut was 3.62 million. Source: the U.S. Census Bureau.

Highest975,074Capitol Planning Region
Lowest96,121Northeastern Connecticut Planning Region
Median328,9969 counties
Connecticut3,618,707History

All counties, 2022

CSVChart (SVG)

Capitol Planning RegionCapitol Planning Region: 975,074 persons975,074Western Connecticut Planning Regi…Western Connecticut Planning Region: 626,146 persons626,146South Central Connecticut Plannin…South Central Connecticut Planning Region: 569,606 persons569,606Naugatuck Valley Planning RegionNaugatuck Valley Planning Region: 453,927 persons453,927Greater Bridgeport Planning RegionGreater Bridgeport Planning Region: 328,996 persons328,996Southeastern Connecticut Planning…Southeastern Connecticut Planning Region: 279,495 persons279,495Lower Connecticut River Valley Pl…Lower Connecticut River Valley Planning Region: 176,095 persons176,095Northwest Hills Planning RegionNorthwest Hills Planning Region: 113,247 persons113,247Northeastern Connecticut Planning…Northeastern Connecticut Planning Region: 96,121 persons96,121
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2022
persons		Change on 2021
1Capitol Planning Region975,074+0.3%
2Western Connecticut Planning Region626,146+0.3%
3South Central Connecticut Planning Region569,606+0.1%
4Naugatuck Valley Planning Region453,927+0.4%
5Greater Bridgeport Planning Region328,996+0.7%
6Southeastern Connecticut Planning Region279,495-0%
7Lower Connecticut River Valley Planning Region176,095+0.3%
8Northwest Hills Planning Region113,247+0.2%
9Northeastern Connecticut Planning Region96,121+0.5%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

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. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Connecticut by population using official data, and cite the source.
rank_places {"indicator":"population","level":"province","within":"Connecticut","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population&level=province&within=Connecticut&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population?

Capitol Planning Region, with 975,074 in 2022, according to the U.S. Census Bureau.

Which county has the lowest population?

Northeastern Connecticut Planning Region, with 96,121 in 2022.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.

Population: other rankings

Counties in Connecticut: more rankings