COUNTY · NE
Sioux County, Nebraska
Sioux County is a county in Nebraska with FIPS code 31165 and an estimated population of 1,154 (Census 2023), 81st largest of 93 in the state.
County facts
- Name
- Sioux County
- State
- Nebraska
- Type
- county
- FIPS code
- 31165
- State FIPS
- 31
- Population (2023)
- 1,154
- Change since 2020
- +1.2%
- State rank
- 81 of 93
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Sioux County?
Sioux County, Nebraska has the five-digit FIPS code 31165: 31 for the state and 165 for the county.
What state is Sioux County in?
Sioux County is in Nebraska.
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.