Sioux County Demographics

A map of Sioux County's Population by Race

Sioux County, Iowa had a population of 35,872 in 2020. It was 83.4% White, 0.5% Black, 0.6% Asian, 13.7% Hispanic, 0.4% Native American/Other, and 1.4% Multiracial. This map presents the population of Sioux County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Sioux County is the 19th most populous county of the 99 counties in Iowa.

Sioux County's White Population

29,919 residents of Sioux County identify as White, or 83.4%. This makes the White share of the population of Sioux County roughly similar to the White share of the population of Iowa (82.7% White). Of the 99 counties in Iowa, Sioux County is ranked #81 in terms of White residents as a share of the population.

Sioux County is less White than neighboring Lyon County (93.6% White), Plymouth County (89.3% White), Union County (89.2% White), O'Brien County (88.9% White), and Lincoln County (89.8% White).

Sioux County's Black Population

184 residents of Sioux County identify as Black, or 0.5%. This makes the Black share of the population of Sioux County roughly similar to the Black share of the population of Iowa (4.1% Black). Of the 99 counties in Iowa, Sioux County is ranked #65 in terms of Black residents as a share of the population.

Sioux County is more Black than neighboring Lyon County (0.3% Black). Sioux County is less Black than neighboring Plymouth County (1.4% Black), Union County (1% Black), O'Brien County (1.1% Black), and Lincoln County (1.7% Black).

Sioux County's Asian Population

219 residents of Sioux County identify as Asian, or 0.6%. This makes the Asian share of the population of Sioux County roughly similar to the Asian share of the population of Iowa (2.4% Asian). Of the 99 counties in Iowa, Sioux County is ranked #34 in terms of Asian residents as a share of the population.

Sioux County is more Asian than neighboring Lyon County (0.2% Asian), and Plymouth County (0.4% Asian). Sioux County is less Asian than neighboring Union County (1.5% Asian), and Lincoln County (1.5% Asian).

Sioux County's Hispanic Population

4,914 residents of Sioux County identify as Hispanic, or 13.7%. This makes the Hispanic share of the population of Sioux County slightly larger than the Hispanic share of the population of Iowa (6.8% Hispanic). Of the 99 counties in Iowa, Sioux County is ranked #10 in terms of Hispanic residents as a share of the population.

Sioux County is more Hispanic than neighboring Lyon County (3.4% Hispanic), Plymouth County (5.8% Hispanic), Union County (3.9% Hispanic), O'Brien County (6.9% Hispanic), and Lincoln County (2.6% Hispanic).

Sioux County's Native American/Other Population

134 residents of Sioux County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 0.4%. This makes the Native American/Other share of the population of Sioux County roughly similar to the Native American/Other share of the population of Iowa (0.7% Native American/Other). Of the 99 counties in Iowa, Sioux County is ranked #61 in terms of Native American/Other residents as a share of the population.

Sioux County is less Native American/Other than neighboring Lyon County (0.6% Native American/Other), Plymouth County (0.9% Native American/Other), Union County (1% Native American/Other), O'Brien County (0.5% Native American/Other), and Lincoln County (0.9% Native American/Other).

Sioux County's Multiracial Population

502 residents of Sioux County identify as Multiracial, or 1.4%. This makes the Multiracial share of the population of Sioux County roughly similar to the Multiracial share of the population of Iowa (3.4% Multiracial). Of the 99 counties in Iowa, Sioux County is ranked #99 in terms of Multiracial residents as a share of the population.

Sioux County is less Multiracial than neighboring Lyon County (1.9% Multiracial), Plymouth County (2.2% Multiracial), Union County (3.4% Multiracial), O'Brien County (1.9% Multiracial), and Lincoln County (3.5% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.