COUNTY · ND
Sioux County, North Dakota
Sioux County is a county in North Dakota with FIPS code 38085 and an estimated population of 3,643 (Census 2023), 30th largest of 53 in the state.
County facts
- Name
- Sioux County
- State
- North Dakota
- Type
- county
- FIPS code
- 38085
- State FIPS
- 38
- Population (2023)
- 3,643
- Change since 2020
- -6.1%
- State rank
- 30 of 53
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in North Dakota
Questions
What is the FIPS code for Sioux County?
Sioux County, North Dakota has the five-digit FIPS code 38085: 38 for the state and 085 for the county.
What state is Sioux County in?
Sioux County is in North Dakota.
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.