Sioux County Demographics

A map of Sioux County's Population by Race

Sioux County, North Dakota has an estimated population of 3,740, a decrease from the 3,898 recorded in the 2020 Census. The population is 83.2% Native American/Other, 12.1% White, 2.2% Multiracial, 1.5% Hispanic, 0.7% Asian, and 0.4% Black. This demographic dot map shows the population of Sioux County, with one dot drawn for each person counted by the Census, color-coded by race.

Sioux has become more racially diverse since the 2020 Census. It is less diverse than North Dakota overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Sioux County, that probability was 27.9% in 2020 and 29.3% in the most recent ACS estimates.

Sioux County is ranked the 30th most populous county in North Dakota, out of 53 counties. Sioux County was ranked the 29th most populous county in the 2020 Census.

Sioux County's White Population

452 residents of Sioux County, or 12.1% of the population, identify as White. The share of White residents in Sioux County is significantly lower than in North Dakota overall, where 81.7% of the population is White. Sioux County ranks 53rd statewide in terms of White residents as a share of the population, out of 53 counties.

Since the 2020 Census, Sioux County's White population has grown by an estimated 12.7%. White residents' share of Sioux County's population has increased from 10.3% to 12.1%.

Sioux County is less White than neighboring Corson County (29.9% White), Grant County (92.3% White), Morton County (86.7% White), Emmons County (93.1% White), and Dewey County (21% White).

Sioux County's Black Population

14 residents of Sioux County, or 0.4% of the population, identify as Black. The share of Black residents in Sioux County is slightly lower than in North Dakota overall, where 3.3% of the population is Black. Sioux County ranks 48th statewide in terms of Black residents as a share of the population, out of 53 counties.

Since the 2020 Census, Sioux County's Black population has grown by an estimated 366.7%. Black residents' share of Sioux County's population has remained roughly unchanged at 0.4%.

Sioux County is more Black than neighboring Corson County (0% Black), Grant County (0.1% Black), and Emmons County (0.1% Black). Sioux County is less Black than neighboring Morton County (1.6% Black), and Dewey County (0.5% Black).

Sioux County's Asian Population

25 residents of Sioux County, or 0.7% of the population, identify as Asian. The share of Asian residents in Sioux County is comparable to the share in North Dakota overall, where 1.6% of the population is Asian. Sioux County ranks 47th statewide in terms of Asian residents as a share of the population, out of 53 counties.

Since the 2020 Census, Sioux County's Asian population has grown by an estimated 1150.0%. Asian residents' share of Sioux County's population has increased from 0.1% to 0.7%.

Sioux County is more Asian than neighboring Corson County (0% Asian), Morton County (0.1% Asian), Emmons County (0.2% Asian), and Dewey County (0.1% Asian). Sioux County is less Asian than neighboring Grant County (1.5% Asian).

Sioux County's Hispanic Population

56 residents of Sioux County, or 1.5% of the population, identify as Hispanic. The share of Hispanic residents in Sioux County is slightly lower than in North Dakota overall, where 4.7% of the population is Hispanic. Sioux County ranks 40th statewide in terms of Hispanic residents as a share of the population, out of 53 counties.

Since the 2020 Census, Sioux County's Hispanic population has declined by an estimated 11.1%. Hispanic residents' share of Sioux County's population has remained roughly unchanged at 1.5%.

Sioux County is more Hispanic than neighboring Corson County (0.5% Hispanic), Grant County (1.2% Hispanic), Emmons County (1.2% Hispanic), and Dewey County (1% Hispanic). Sioux County is less Hispanic than neighboring Morton County (4.4% Hispanic).

Sioux County's Native American/Other Population

3,110 residents of Sioux County, or 83.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Sioux County is significantly higher than in North Dakota overall, where 4.7% of the population is Native American/Other. Sioux County ranks 1st statewide in terms of Native American/Other residents as a share of the population, out of 53 counties.

Since the 2020 Census, Sioux County's Native American/Other population has declined by an estimated 5.2%. Native American/Other residents' share of Sioux County's population has decreased from 84.2% to 83.2%.

Sioux County is more Native American/Other than neighboring Corson County (66.5% Native American/Other), Grant County (2.3% Native American/Other), Morton County (4.6% Native American/Other), Emmons County (1.5% Native American/Other), and Dewey County (73.8% Native American/Other).

Sioux County's Multiracial Population

83 residents of Sioux County, or 2.2% of the population, identify as Multiracial. The share of Multiracial residents in Sioux County is comparable to the share in North Dakota overall, where 4% of the population is Multiracial. Sioux County ranks 14th statewide in terms of Multiracial residents as a share of the population, out of 53 counties.

Since the 2020 Census, Sioux County's Multiracial population has declined by an estimated 43.9%. Multiracial residents' share of Sioux County's population has decreased from 3.8% to 2.2%.

Sioux County is less Multiracial than neighboring Corson County (3% Multiracial), Grant County (2.5% Multiracial), Morton County (2.6% Multiracial), Emmons County (3.8% Multiracial), and Dewey County (3.6% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.