What are the fastest-growing planning regions in Connecticut?
Greater Bridgeport Planning Region is the fastest-growing planning region in Connecticut: its population grew 0.81% a year from 2020 to 2025, to 337,697 residents (Census PEP Vintage 2025). Western Connecticut Planning Region (0.69%) and Naugatuck Valley Planning Region (0.63%) follow. Connecticut as a whole grew 0.60% a year to 3,688,496 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 9 planning regions in Connecticut by population growth, 2020 to 2025
| Rank | Planning region | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Greater Bridgeport Planning Region | 337,697 | 0.81% | -7,902 | +16,357 | -$54.8M |
| 2 | Western Connecticut Planning Region | 640,482 | 0.69% | -16,173 | +29,703 | +$97.4M |
| 3 | Naugatuck Valley Planning Region | 463,349 | 0.63% | +4,650 | +9,874 | -$23.7M |
| 4 | Capitol Planning Region | 994,115 | 0.62% | +3,006 | +27,679 | -$298.5M |
| 5 | Northeastern Connecticut Planning Region | 98,096 | 0.60% | +3,075 | +550 | +$21.6M |
| 6 | South Central Connecticut Planning Region | 578,741 | 0.50% | -2,466 | +17,221 | -$215.5M |
| 7 | Lower Connecticut River Valley Planning Region | 177,311 | 0.46% | +3,757 | +2,329 | -$16.4M |
| 8 | Northwest Hills Planning Region | 114,690 | 0.44% | +2,509 | +1,547 | +$25.5M |
| 9 | Southeastern Connecticut Planning Region | 284,015 | 0.40% | +2,833 | +4,474 | +$4.4M |
Where are people moving in Connecticut?
Naugatuck Valley Planning Region gained the most people from elsewhere in the United States: net domestic migration of +4,650 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Connecticut place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | Planning region | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Naugatuck Valley Planning Region | 463,349 | 0.63% | +4,650 | +9,874 | -$23.7M |
| 2 | Lower Connecticut River Valley Planning Region | 177,311 | 0.46% | +3,757 | +2,329 | -$16.4M |
| 3 | Northeastern Connecticut Planning Region | 98,096 | 0.60% | +3,075 | +550 | +$21.6M |
| 4 | Capitol Planning Region | 994,115 | 0.62% | +3,006 | +27,679 | -$298.5M |
| 5 | Southeastern Connecticut Planning Region | 284,015 | 0.40% | +2,833 | +4,474 | +$4.4M |
| 6 | Northwest Hills Planning Region | 114,690 | 0.44% | +2,509 | +1,547 | +$25.5M |
| 7 | South Central Connecticut Planning Region | 578,741 | 0.50% | -2,466 | +17,221 | -$215.5M |
| 8 | Greater Bridgeport Planning Region | 337,697 | 0.81% | -7,902 | +16,357 | -$54.8M |
| 9 | Western Connecticut Planning Region | 640,482 | 0.69% | -16,173 | +29,703 | +$97.4M |
Go past the headline numbers
The interactive Demographics map layer and the full report for a single place are part of paid plans.
Get the Demographics Report for Greater Bridgeport Planning RegionFrequently asked questions
- What are the fastest-growing planning regions in Connecticut?
- By population growth from 2020 to 2025, the fastest are Greater Bridgeport Planning Region (0.81% a year), Western Connecticut Planning Region (0.69% a year), Naugatuck Valley Planning Region (0.63% a year), Capitol Planning Region (0.62% a year) and Northeastern Connecticut Planning Region (0.60% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Connecticut?
- By net domestic migration from 2020 to 2025, the largest gains are Naugatuck Valley Planning Region (+4,650), Lower Connecticut River Valley Planning Region (+3,757) and Northeastern Connecticut Planning Region (+3,075) (Census PEP Vintage 2025).
- How fast is Connecticut growing overall?
- Connecticut grew 0.60% a year from 2020 to 2025, to 3,688,496 residents, with net migration of +103,023 people (Census PEP Vintage 2025).
- Where does this Connecticut data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Planning regions with fewer than 10,000 residents are not ranked. Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.