Mountain Plains, SD Demographics

A map of Mountain Plains's Population by Race

Mountain Plains, South Dakota has an estimated population of 350, an increase from the 327 recorded in the 2020 Census. The population is 82.9% White, 9.1% Multiracial, 7.4% Asian, 0.6% Hispanic, 0.0% Black, and 0.0% Native American/Other. This demographic dot map shows the population of Mountain Plains, with one dot drawn for each person counted by the Census, color-coded by race.

Mountain Plains has become considerably more racially diverse since the 2020 Census. It is considerably less diverse than South Dakota overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Mountain Plains, that probability was 12.2% in 2020 and 30.0% in the most recent ACS estimates.

Mountain Plains is ranked the 182nd most populous place in South Dakota, out of 485 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Mountain Plains was ranked the 186th most populous place in the 2020 Census.

Mountain Plains's White Population

290 residents of Mountain Plains, or 82.9% of the population, identify as White. The share of White residents in Mountain Plains is slightly higher than in South Dakota overall, where 79.8% of the population is White. Mountain Plains ranks 137th statewide in terms of White residents as a share of the population, out of 485 places.

Since the 2020 Census, Mountain Plains's White population has declined by an estimated 5.2%. White residents' share of Mountain Plains's population has decreased from 93.6% to 82.9%.

Mountain Plains is less White than neighboring Spearfish (87.3% White), North Spearfish (93.5% White), Central City (99.3% White), Lead (91.8% White), and Deadwood (90.3% White).

Mountain Plains's Black Population

0 residents of Mountain Plains, or 0.0% of the population, identify as Black. The share of Black residents in Mountain Plains is slightly lower than in South Dakota overall, where 2.1% of the population is Black. Mountain Plains ranks 128th statewide in terms of Black residents as a share of the population, out of 485 places.

Since the 2020 Census, Mountain Plains's Black population has declined by an estimated 100.0%. Black residents' share of Mountain Plains's population has remained roughly unchanged at 0.0%.

Mountain Plains is less Black than neighboring Spearfish (0.2% Black), North Spearfish (1.6% Black), Lead (0.2% Black), and Deadwood (0.7% Black).

Mountain Plains's Asian Population

26 residents of Mountain Plains, or 7.4% of the population, identify as Asian. The share of Asian residents in Mountain Plains is higher than in South Dakota overall, where 1.4% of the population is Asian. Mountain Plains ranks 176th statewide in terms of Asian residents as a share of the population, out of 485 places.

Since the 2020 Census, Mountain Plains's Asian population has grown from 0 to an estimated 26. Asian residents' share of Mountain Plains's population has increased from 0.0% to 7.4%.

Mountain Plains is more Asian than neighboring Spearfish (0.6% Asian), North Spearfish (0% Asian), Central City (0% Asian), Lead (0% Asian), and Deadwood (1.7% Asian).

Mountain Plains's Hispanic Population

2 residents of Mountain Plains, or 0.6% of the population, identify as Hispanic. The share of Hispanic residents in Mountain Plains is slightly lower than in South Dakota overall, where 4.8% of the population is Hispanic. Mountain Plains ranks 291st statewide in terms of Hispanic residents as a share of the population, out of 485 places.

Since the 2020 Census, Mountain Plains's Hispanic population has declined by an estimated 60.0%. Hispanic residents' share of Mountain Plains's population has decreased from 1.5% to 0.6%.

Mountain Plains is more Hispanic than neighboring Central City (0% Hispanic). Mountain Plains is less Hispanic than neighboring Spearfish (3.9% Hispanic), North Spearfish (2.9% Hispanic), Lead (2.4% Hispanic), and Deadwood (4.5% Hispanic).

Mountain Plains's Native American/Other Population

0 residents of Mountain Plains, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Mountain Plains is lower than in South Dakota overall, where 7.5% of the population is Native American/Other. Mountain Plains ranks 340th statewide in terms of Native American/Other residents as a share of the population, out of 485 places.

Since the 2020 Census, Mountain Plains's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Mountain Plains's population has remained roughly unchanged at 0.0%.

Mountain Plains is less Native American/Other than neighboring Spearfish (3.9% Native American/Other), North Spearfish (2% Native American/Other), Central City (0.7% Native American/Other), Lead (1.9% Native American/Other), and Deadwood (0.6% Native American/Other).

Mountain Plains's Multiracial Population

32 residents of Mountain Plains, or 9.1% of the population, identify as Multiracial. The share of Multiracial residents in Mountain Plains is slightly higher than in South Dakota overall, where 4.4% of the population is Multiracial. Mountain Plains ranks 145th statewide in terms of Multiracial residents as a share of the population, out of 485 places.

Since the 2020 Census, Mountain Plains's Multiracial population has grown by an estimated 128.6%. Multiracial residents' share of Mountain Plains's population has increased from 4.3% to 9.1%.

Mountain Plains is more Multiracial than neighboring Spearfish (4.1% Multiracial), North Spearfish (0% Multiracial), Central City (0% Multiracial), Lead (3.7% Multiracial), and Deadwood (2.3% 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.