Is population growing or shrinking?

Updated annually
It grew by 14,000 between 2024 and 2025. Changes in population reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. Connecticut’s 0.38% annual increase was primarily driven by immigration to the state. In the decade between 2015 and 2025, Connecticut’s population grew by 2.1%.

+14K

population change (2024 to 2025)

+0.38%

percent change in population (2024 to 2025)
Since 2000, Connecticut's population increased in 20 of 25 years. The largest increase occurred between 2023 and 2024, when it gained 33,100 residents. The state's largest decline during the 21st century occurred between 2019 and 2020 when it lost 27,500 residents.

Connecticut gained 14,000 residents between 2024 and 2025.

Annual population change

A state’s population is influenced by three factors:
  • Natural population change: If births outnumber deaths in a given year, natural population growth is positive. If deaths exceed births, it is negative. Between 2024 to 2025 natural population change was positive in Connecticut, with births exceeding deaths by 2,300.
  • Immigration: international migration directly into or out of a state. If more people move in than move out, population change from immigration is positive. If more people move out than move in, it’s negative. Connecticut’s population change from immigration was positive, with about 17,500 more people coming from another country to Connecticut than leaving.
  • Domestic migration, moving between states: Connecticut’s population change from domestic migration was negative, with about 5,900 more people leaving for another state than moving in.

Between 2024 and 2025, immigration was the primary driver of population growth in Connecticut.

Components of population change

Among 9 county equivalents, Capitol Planning Region had the largest population growth in Connecticut, welcoming 8,182 new residents. Northwest Hills Planning Region gained the fewest, with a gain of 563 residents. County-level population data is available as of 2024.
Greater Bridgeport Planning Region led Connecticut in percent population increase between 2023 and 2024 at 1.3%. Lower Connecticut River Valley Planning Region ranked last with a 0.49% increase.

Between 2023 and 2024, Greater Bridgeport Planning Region gained 1.3% in population, the largest increase in Connecticut.

Population change

Between 2015 and 2025, Connecticut’s population has increased by 2.1%. During that same period, the US population grew by 6.2%. Connecticut ranks 35th among states in population growth over that decade.

Connecticut ranked 35th in population growth between 2015 and 2025.

Percent change in population

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Methodology

USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.

The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.

Page sources

USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.