Data / Population / Sioux County

Population in Sioux County

Population in Sioux County was 3,667 in 2025, according to the U.S. Census Bureau. That is down 1.3% from 2024. That is the 30th highest of 53 counties in 2025.

2025, persons3,667
Change on 2024-1.3%
Rank30th of 53Counties in North Dakota ranked
Series high3,8762020
Series low3,6412023

Population in Sioux County, 2020 to 2025

CSVChart (SVG)

3,6003,6503,7003,7503,8003,8503,9002020202120222023202420252020: 3,876 persons2021: 3,739 persons2022: 3,682 persons2023: 3,641 persons2024: 3,717 persons2025: 3,667 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
20253,667
20243,717
20233,641
20223,682
20213,739
20203,876

Compared with North Dakota and United States

Place2025
Sioux County3,667
North Dakota799,358
United States341,784,857

Rankings

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

What is the population in Sioux County?

Population in Sioux County was 3,667 in 2025, according to the U.S. Census Bureau. That is down 1.3% from 2024. That is the 30th highest of 53 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Sioux County?

3,876 in 2020, the highest value since 2020 in this series.

More statistics for Sioux County

All statistics for Sioux County