COUNTY · NY
Seneca County, New York
Seneca County is a county in New York with FIPS code 36099 and an estimated population of 32,349 (Census 2023), 57th largest of 62 in the state.
County facts
- Name
- Seneca County
- State
- New York
- Type
- county
- FIPS code
- 36099
- State FIPS
- 36
- Population (2023)
- 32,349
- Change since 2020
- -3.5%
- State rank
- 57 of 62
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Seneca County?
Seneca County, New York has the five-digit FIPS code 36099: 36 for the state and 099 for the county.
What state is Seneca County in?
Seneca 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.