Union County Demographics

A map of Union County's Population by Race

Union County, South Dakota had a population of 16,811 in 2020. It was 89.2% White, 1.0% Black, 1.5% Asian, 3.9% Hispanic, 1.0% Native American/Other, and 3.4% Multiracial. This map presents the population of Union County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Union County is the 13th most populous county of the 66 counties in South Dakota.

Union County's White Population

14,994 residents of Union County identify as White, or 89.2%. This makes the White share of the population of Union County slightly larger than the White share of the population of South Dakota (79.6% White). Of the 66 counties in South Dakota, Union County is ranked #29 in terms of White residents as a share of the population.

Union County is more White than neighboring Clay County (84.6% White), Dixon County (82.8% White), and Dakota County (43.3% White). Union County is less White than neighboring Lincoln County (89.8% White), and Plymouth County (89.3% White).

Union County's Black Population

169 residents of Union County identify as Black, or 1.0%. This makes the Black share of the population of Union County roughly similar to the Black share of the population of South Dakota (2% Black). Of the 66 counties in South Dakota, Union County is ranked #10 in terms of Black residents as a share of the population.

Union County is more Black than neighboring Dixon County (0.3% Black). Union County is less Black than neighboring Clay County (1.6% Black), Dakota County (7.4% Black), Lincoln County (1.7% Black), and Plymouth County (1.4% Black).

Union County's Asian Population

247 residents of Union County identify as Asian, or 1.5%. This makes the Asian share of the population of Union County roughly similar to the Asian share of the population of South Dakota (1.5% Asian). Of the 66 counties in South Dakota, Union County is ranked #7 in terms of Asian residents as a share of the population.

Union County is more Asian than neighboring Dixon County (0.3% Asian), and Plymouth County (0.4% Asian). Union County is less Asian than neighboring Clay County (2.4% Asian), and Dakota County (2.8% Asian).

Union County's Hispanic Population

661 residents of Union County identify as Hispanic, or 3.9%. This makes the Hispanic share of the population of Union County roughly similar to the Hispanic share of the population of South Dakota (4.4% Hispanic). Of the 66 counties in South Dakota, Union County is ranked #18 in terms of Hispanic residents as a share of the population.

Union County is more Hispanic than neighboring Clay County (3.1% Hispanic), and Lincoln County (2.6% Hispanic). Union County is less Hispanic than neighboring Dixon County (14.2% Hispanic), Dakota County (40.8% Hispanic), and Plymouth County (5.8% Hispanic).

Union County's Native American/Other Population

176 residents of Union County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 1.0%. This makes the Native American/Other share of the population of Union County slightly less than the Native American/Other share of the population of South Dakota (8.7% Native American/Other). Of the 66 counties in South Dakota, Union County is ranked #52 in terms of Native American/Other residents as a share of the population.

Union County is more Native American/Other than neighboring Dixon County (0.5% Native American/Other), Lincoln County (0.9% Native American/Other), and Plymouth County (0.9% Native American/Other). Union County is less Native American/Other than neighboring Clay County (4% Native American/Other), and Dakota County (3.3% Native American/Other).

Union County's Multiracial Population

564 residents of Union County identify as Multiracial, or 3.4%. This makes the Multiracial share of the population of Union County roughly similar to the Multiracial share of the population of South Dakota (3.9% Multiracial). Of the 66 counties in South Dakota, Union County is ranked #28 in terms of Multiracial residents as a share of the population.

Union County is more Multiracial than neighboring Dixon County (1.9% Multiracial), Dakota County (2.3% Multiracial), and Plymouth County (2.2% Multiracial). Union County is less Multiracial than neighboring Clay County (4.4% Multiracial), and Lincoln County (3.5% Multiracial).

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