COUNTY · FL
Nassau County, Florida
Nassau County is a county in Florida with FIPS code 12089 and an estimated population of 101,501 (Census 2023), 37th largest of 67 in the state.
County facts
- Name
- Nassau County
- State
- Florida
- Type
- county
- FIPS code
- 12089
- State FIPS
- 12
- Population (2023)
- 101,501
- Change since 2020
- +11.5%
- State rank
- 37 of 67
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Nassau County?
Nassau County, Florida has the five-digit FIPS code 12089: 12 for the state and 089 for the county.
What state is Nassau County in?
Nassau County is in Florida.
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.