COUNTY · CT

New Haven County, Connecticut

New Haven County is a county in Connecticut with FIPS code 09009.

County facts

Name: New Haven County
State: Connecticut
Type: county
FIPS code: 09009
State FIPS: 09

Population is the Census Bureau’s Vintage 2023 estimate. Connecticut’s 2023 estimates use planning regions instead of counties, so county population is not available.

Other counties in Connecticut

All 8

Questions

What is the FIPS code for New Haven County?

New Haven County, Connecticut has the five-digit FIPS code 09009: 09 for the state and 009 for the county.

What state is New Haven County in?

New Haven County is in Connecticut.

How do I know if an address is in this county?

Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.

Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.