The largest planning region in Connecticut
Unusually, Connecticut gives the same answer on both measures: Capitol Planning Region is the largest by land area and the most populous.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.
By land area
| Rank | Name | Land area | Population |
|---|---|---|---|
| 1 | Capitol Planning Region | 1,027 sq mi | 994,115 |
| 2 | Northwest Hills Planning Region | 786.6 sq mi | 114,690 |
| 3 | Southeastern Connecticut Planning Region | 598.1 sq mi | 284,015 |
| 4 | Northeastern Connecticut Planning Region | 553.9 sq mi | 98,096 |
| 5 | Western Connecticut Planning Region | 532.1 sq mi | 640,482 |
| 6 | Lower Connecticut River Valley Planning Region | 424.1 sq mi | 177,311 |
| 7 | Naugatuck Valley Planning Region | 412.8 sq mi | 463,349 |
| 8 | South Central Connecticut Planning Region | 367.3 sq mi | 578,741 |
| 9 | Greater Bridgeport Planning Region | 140.2 sq mi | 337,697 |
By population
| Rank | Name | Population | Density |
|---|---|---|---|
| 1 | Capitol Planning Region | 994,115 | 968 per sq mi |
| 2 | Western Connecticut Planning Region | 640,482 | 1,204 per sq mi |
| 3 | South Central Connecticut Planning Region | 578,741 | 1,576 per sq mi |
| 4 | Naugatuck Valley Planning Region | 463,349 | 1,122 per sq mi |
| 5 | Greater Bridgeport Planning Region | 337,697 | 2,409 per sq mi |
| 6 | Southeastern Connecticut Planning Region | 284,015 | 475 per sq mi |
| 7 | Lower Connecticut River Valley Planning Region | 177,311 | 418 per sq mi |
| 8 | Northwest Hills Planning Region | 114,690 | 146 per sq mi |
| 9 | Northeastern Connecticut Planning Region | 98,096 | 177 per sq mi |
And the smallest
More on Connecticut
Rebuilt from source data 30 August 2026. How these figures are produced.