COUNTY · CT
Hartford County, Connecticut
Hartford County is a county in Connecticut with FIPS code 09003.
County facts
- Name
- Hartford County
- State
- Connecticut
- Type
- county
- FIPS code
- 09003
- 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.
Questions
What is the FIPS code for Hartford County?
Hartford County, Connecticut has the five-digit FIPS code 09003: 09 for the state and 003 for the county.
What state is Hartford County in?
Hartford 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.