Business planning by county

Connecticut county reference

9 counties and county equivalents in Connecticut. Search names or FIPS codes, compare Census geography and keep the original sources with your work.

• Capitol Planning Region

  Connecticut · FIPS 09110

  994,115 residents · 2025 estimate

• Greater Bridgeport Planning Region

  Connecticut · FIPS 09120

  337,697 residents · 2025 estimate

• Lower Connecticut River Valley Planning Region

  Connecticut · FIPS 09130

  177,311 residents · 2025 estimate

• Naugatuck Valley Planning Region

  Connecticut · FIPS 09140

  463,349 residents · 2025 estimate

• Northeastern Connecticut Planning Region

  Connecticut · FIPS 09150

  98,096 residents · 2025 estimate

• Northwest Hills Planning Region

  Connecticut · FIPS 09160

  114,690 residents · 2025 estimate

• South Central Connecticut Planning Region

  Connecticut · FIPS 09170

  578,741 residents · 2025 estimate

• Southeastern Connecticut Planning Region

  Connecticut · FIPS 09180

  284,015 residents · 2025 estimate

• Western Connecticut Planning Region

  Connecticut · FIPS 09190

  640,482 residents · 2025 estimate

Use the county data

Use a county reference when organizing a market-research brief, outreach territory or business calculation. County population gives geographic context; it does not measure the number of qualified customers.

These are geographic reference records, not contact lists or verified sales leads.

Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.