COUNTY · NY
Nassau County, New York
Nassau County is a county in New York with FIPS code 36059 and an estimated population of 1,381,715 (Census 2023), 5th largest of 62 in the state.
County facts
- Name
- Nassau County
- State
- New York
- Type
- county
- FIPS code
- 36059
- State FIPS
- 36
- Population (2023)
- 1,381,715
- Change since 2020
- -0.6%
- State rank
- 5 of 62
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Nassau County?
Nassau County, New York has the five-digit FIPS code 36059: 36 for the state and 059 for the county.
What state is Nassau County in?
Nassau County is in New York.
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.