Dewey County Demographics

A map of Dewey County's Population by Race

Dewey County, South Dakota had a population of 5,239 in 2020. It was 16.2% White, 0.2% Black, 0.1% Asian, 1.5% Hispanic, 78.0% Native American/Other, and 4.0% Multiracial. This map presents the population of Dewey County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Dewey County is the 35th most populous county of the 66 counties in South Dakota.

Dewey County's White Population

849 residents of Dewey County identify as White, or 16.2%. This makes the White share of the population of Dewey County considerably less than the White share of the population of South Dakota (79.6% White). Of the 66 counties in South Dakota, Dewey County is ranked #63 in terms of White residents as a share of the population.

Dewey County is less White than neighboring Corson County (24.5% White), Stanley County (85.7% White), Ziebach County (16.7% White), Sully County (92.3% White), and Walworth County (77.4% White).

Dewey County's Black Population

9 residents of Dewey County identify as Black, or 0.2%. This makes the Black share of the population of Dewey County roughly similar to the Black share of the population of South Dakota (2% Black). Of the 66 counties in South Dakota, Dewey County is ranked #42 in terms of Black residents as a share of the population.

Dewey County is more Black than neighboring Ziebach County (0% Black). Dewey County is less Black than neighboring Stanley County (0.4% Black), and Sully County (0.3% Black).

Dewey County's Asian Population

6 residents of Dewey County identify as Asian, or 0.1%. This makes the Asian share of the population of Dewey County roughly similar to the Asian share of the population of South Dakota (1.5% Asian). Of the 66 counties in South Dakota, Dewey County is ranked #55 in terms of Asian residents as a share of the population.

Dewey County is less Asian than neighboring Corson County (0.5% Asian), Stanley County (0.2% Asian), Sully County (0.4% Asian), and Walworth County (0.2% Asian).

Dewey County's Hispanic Population

81 residents of Dewey County identify as Hispanic, or 1.5%. This makes the Hispanic share of the population of Dewey County roughly similar to the Hispanic share of the population of South Dakota (4.4% Hispanic). Of the 66 counties in South Dakota, Dewey County is ranked #54 in terms of Hispanic residents as a share of the population.

Dewey County is more Hispanic than neighboring Corson County (1.2% Hispanic), Stanley County (1% Hispanic), and Ziebach County (1.4% Hispanic). Dewey County is less Hispanic than neighboring Sully County (2.9% Hispanic), and Walworth County (1.9% Hispanic).

Dewey County's Native American/Other Population

4,086 residents of Dewey County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 78.0%. This makes the Native American/Other share of the population of Dewey County considerably larger than the Native American/Other share of the population of South Dakota (8.7% Native American/Other). Of the 66 counties in South Dakota, Dewey County is ranked #5 in terms of Native American/Other residents as a share of the population.

Dewey County is more Native American/Other than neighboring Corson County (69.2% Native American/Other), Stanley County (6.9% Native American/Other), Sully County (0.7% Native American/Other), and Walworth County (15% Native American/Other). Dewey County is less Native American/Other than neighboring Ziebach County (78.9% Native American/Other).

Dewey County's Multiracial Population

208 residents of Dewey County identify as Multiracial, or 4.0%. This makes the Multiracial share of the population of Dewey County roughly similar to the Multiracial share of the population of South Dakota (3.9% Multiracial). Of the 66 counties in South Dakota, Dewey County is ranked #21 in terms of Multiracial residents as a share of the population.

Dewey County is more Multiracial than neighboring Ziebach County (2.8% Multiracial), and Sully County (3.4% Multiracial). Dewey County is less Multiracial than neighboring Corson County (4.4% Multiracial), Stanley County (5.8% Multiracial), and Walworth County (5.4% Multiracial).

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