Population By Race and Ethnicity in Dewey, SD in 2018

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2018, the 5,904 population of Dewey County, South Dakota comprised of 256 people who identified as Hispanic (4.34%), and 5,648 people who identified as Non-Hispanic (95.66%).

Race: The American Indian and Alaska Native Alone population was the largest racial group in Dewey County, South Dakota with a population of 4,423 (74.92%); White Alone population was the second largest racial group with a population of 1,203 (20.38%); and Two Or More Races was the third largest racial group with a population of 241 (4.08%).

Ethnicity: The American Indian and Alaska Native Alone - Non Hispanic population was the largest ethnic group in Dewey County, South Dakota in 2018, with a population of 4,239 (71.8%); the second largest ethnic group was White Alone - Non Hispanic with a population of 1,154 (19.55%); and the third largest ethnic group was Two Or More Races - Non Hispanic with a population of 222 (3.76%).

The charts and tables below shows the population and percentage of each racial and ethnicity group in Dewey, South Dakota.

You can find similar information for other South Dakota counties, and for South Dakota.

See this for other years:
Hispanics and Non Hispanics in Dewey, SD in 2018
Total Population:
Race in Dewey, SD in 2018
Total Population:
Ethnicity in Dewey, SD in 2018
Total Population:
Population By Race in Dewey , SD in 2018
Race Population Percentage
Black or African American Alone 23 0.39%
White Alone 1,203 20.38%
American Indian and Alaska Native Alone 4,423 74.92%
Asian Alone 13 0.22%
Native Hawaiian And Pacific Islander Alone 1 0.02%
Two Or More Races 241 4.08%
Population By Ethnicity in Dewey , SD in 2018
Ethnicity Population Percentage
Black or African American Alone - Hispanic 3 0.05%
White Alone - Hispanic 49 0.83%
American Indian and Alaska Native Alone - Hispanic 184 3.12%
Asian Alone - Hispanic 1 0.02%
Native Hawaiian And Pacific Islander Alone - Hispanic 0 0%
Two Or More Races - Hispanic 19 0.32%
Black or African American Alone - Non Hispanic 20 0.34%
White Alone - Non Hispanic 1,154 19.55%
American Indian and Alaska Native Alone - Non Hispanic 4,239 71.8%
Asian Alone - Non Hispanic 12 0.2%
Native Hawaiian And Pacific Islander Alone - Non Hispanic 1 0.02%
Two Or More Races - Non Hispanic 222 3.76%