Sioux County, North Dakota
Sioux County, North Dakota, has 3,667 residents (July 2025 estimate). Its county seat is Fort Yates. It uses Central Time and Mountain Time and covers 1,094 sq mi (2,834 km²) of land.
- Resident population, July 2025
- 3,667
- Land area
- 1,094 sq mi (2,834 km²)
- County seat or government
- Fort Yates
- Time zone
- Central Time, Mountain TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $42,083 ± $7,116
- Median home value
- $85,400 ± $11,826
- Median rent, with utilities
- $444 ± $55
- Homes lived in by their owners
- 46.6% ± 5.2 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Bismarck, ND metro area
- Water area
- 34.2 sq mi (88.4 km²)
- State
- North Dakota
- County code (FIPS)
- 38085
- Coordinates (central point)
- 46.110618, -101.061284
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Sioux County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
| Mountain TimeAmerica/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Sioux County straddles a time-zone line; check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 585382,171 people
- 576421,969 people
- 576381,852 people
- 58528677 people
- 58568544 people
- 58570437 people
- 57641215 people
- 57645184 people
- 57660111 people
9 ZIP Code areas overlap Sioux County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Sioux County, largest first
- Menz Township17 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in North Dakota, by county
School districts in Sioux County, largest first
- Fort Yates Public School District 42,409 people
- Solen Public School District 3982 people
- Selfridge Public School District 8392 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Tribal areas in Sioux County, largest first
- Standing Rock Reservation7,546 people
American Indian, Alaska Native and Native Hawaiian areas as the Census Bureau maps them, with at least 2% of their area here, water included. These lines don’t decide membership, jurisdiction or land status.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Cannon Ball, North Dakota (CDP)748 people
- Selfridge, North Dakota (city)198 people
- Porcupine, North Dakota (CDP)138 people
- Fort Yates, North Dakota (city)107 people
- Solen, North Dakota (city)105 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Corson County, South Dakota30 mi south
- Grant County, North Dakota32 mi northwest
- Emmons County, North Dakota41 mi east
- Morton County, North Dakota43 mi north
- Adams County, North Dakota71 mi west
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
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