Sioux County, North Dakota

Sioux County population, land area and income

Sioux County had 3,713 residents in the Census Vintage 2024 estimate, on 1,094.1 square miles of land. It ranks 29th of 53 in North Dakota by population and 34th by land area. That works out to 3.4 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in North Dakota has 3,853 residents, about the same as Sioux County.

Its SAIPE 2023 median household income of $46,931 is in the bottom quarter among 3,143 counties with an estimate.

How Sioux County's population changed since 2020

Sioux County lost 168 residents between the July 2020 and July 2024 estimates, a drop of 4.3%. That ranks 52nd of 53 in North Dakota for growth. The median North Dakota county changed by -1.3%, and the state as a whole by +2.2%.

Since the April 2020 estimates base, Sioux County recorded 235 births and 243 deaths, a natural change of -8. Net international migration added +2 and net domestic migration, people moving to or from other US counties, came to -169. The largest single component was domestic migration, which removed 169 people.

Where Sioux County is

The Census internal point of Sioux County is at 46.110600, -101.061300. It sits in UTM zone 14N. The map shades North Dakota's 53 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Sioux County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Sioux County

No incorporated place of 1,000 or more people has residents in Sioux County. Its 3,713 residents live in smaller towns, census-designated places, or unincorporated land, which the subcounty estimates do not list at this size.

Counties bordering Sioux County

The Census 2024 county adjacency file lists 5 neighbors for Sioux County, including 1 across a state line. The most populous is Morton County, ND, with 34,194 residents. Distances run between Census internal points in a straight line.

• Morton County

  34,194 people

  43 mi NNW

• SD

  Corson County, SD

  3,747 people

  30 mi S

• Emmons County

  3,209 people

  41 mi ENE

• Grant County

  2,247 people

  32 mi WNW

• Adams County

  2,141 people

  71 mi W

Distance to Bismarck and the nearest big city

Bismarck is 50.8 miles NNE of Sioux County's internal point in a straight line. The nearest place of 100,000 or more is Fargo, ND (population 136,285), 207.9 miles away. The nearest place of 10,000 or more is Mandan, ND (population 24,788), 50.3 miles away.

Sioux County FIPS code

The FIPS code of Sioux County is 38085: state code 38 for North Dakota plus county code 085. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $46,931.