Is Connecticut's population growing or shrinking?
+14K
+0.38%
Connecticut gained 14,000 residents between 2024 and 2025.
Annual population change, 1901–2025
What contributes to population change in Connecticut?
- 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, 2011–2025
Which counties in Connecticut are growing? Which are shrinking?
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Between 2024 and 2025, Capitol Planning Region gained 0.5% in population, the largest increase in Connecticut.
Population change
How does population change in Connecticut compare to other states?
Connecticut ranked 35th in population growth between 2015 and 2025.
Percent change in population
Population change between 2024 and 2025, by county in Connecticut
| County | Population change rate | |
|---|---|---|
| 1. | Capitol Planning Region, CT | +0.5% |
| 2. | Northeastern Connecticut Planning Region, CT | +0.48% |
| 3. | Western Connecticut Planning Region, CT | +0.43% |
| 4. | Naugatuck Valley Planning Region, CT | +0.4% |
| 5. | Greater Bridgeport Planning Region, CT | +0.39% |
| 6. | Northwest Hills Planning Region, CT | +0.36% |
| 7. | Southeastern Connecticut Planning Region, CT | +0.3% |
| 8. | South Central Connecticut Planning Region, CT | +0.21% |
| 9. | Lower Connecticut River Valley Planning Region, CT | +0.15% |
Population change between 2015 and 2025, by state
| State | Population change rate | |
|---|---|---|
| 1. | Idaho | +22% |
| 2. | Utah | +17.9% |
| 3. | Florida | +16.5% |
| 4. | Texas | +15.8% |
| 5. | Nevada | +14.9% |
| 6. | South Carolina | +14.8% |
| 7. | Arizona | +13.7% |
| 8. | North Carolina | +12.4% |
| 9. | Delaware | +12.2% |
| 10. | Washington state | +11.4% |
How is the US population changing?
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
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.
