Marshall County Demographics

A map of Marshall County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	3,636	3,599	83.7%	83.6%
Hispanic	278	255	6.4%	5.9%
Native American/Other	252	325	5.8%	7.5%
Multiracial	165	109	3.8%	2.5%
Asian	8	12	0.2%	0.3%
Black	5	6	0.1%	0.1%

Marshall County, South Dakota has an estimated population of 4,344, a less than 1% change from the 4,306 recorded in the 2020 Census. The population is 83.7% White, 6.4% Hispanic, 5.8% Native American/Other, 3.8% Multiracial, 0.2% Asian, and 0.1% Black. This demographic dot map shows the population of Marshall County, with one dot drawn for each person counted by the Census, color-coded by race.

Marshall is about as racially diverse as it was in 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 Marshall County, that probability was 29.2% in 2020 and 29.0% in the most recent ACS estimates.

Marshall County is ranked the 37th most populous county in South Dakota, out of 66 counties. Marshall County was ranked the 37th most populous county in the 2020 Census.

Marshall County's White Population

3,636 residents of Marshall County, or 83.7% of the population, identify as White. The share of White residents in Marshall County is slightly higher than in South Dakota overall, where 79.8% of the population is White. Marshall County ranks 46th statewide in terms of White residents as a share of the population, out of 66 counties.

Since the 2020 Census, Marshall County's White population has grown by an estimated 1.0%. White residents' share of Marshall County's population has remained roughly unchanged at 83.7%.

Marshall County is more White than neighboring Day County (83% White), and Roberts County (56.5% White). Marshall County is less White than neighboring Sargent County (89.6% White), Ransom County (91.8% White), and Brown County (84.7% White).

Marshall County's Black Population

5 residents of Marshall County, or 0.1% of the population, identify as Black. The share of Black residents in Marshall County is comparable to the share in South Dakota overall, where 2.1% of the population is Black. Marshall County ranks 48th statewide in terms of Black residents as a share of the population, out of 66 counties.

Since the 2020 Census, Marshall County's Black population has declined by an estimated 16.7%. Black residents' share of Marshall County's population has remained roughly unchanged at 0.1%.

Marshall County is more Black than neighboring Day County (0% Black). Marshall County is less Black than neighboring Sargent County (3.2% Black), Roberts County (0.3% Black), Ransom County (1.1% Black), and Brown County (1.3% Black).

Marshall County's Asian Population

8 residents of Marshall County, or 0.2% of the population, identify as Asian. The share of Asian residents in Marshall County is comparable to the share in South Dakota overall, where 1.4% of the population is Asian. Marshall County ranks 36th statewide in terms of Asian residents as a share of the population, out of 66 counties.

Since the 2020 Census, Marshall County's Asian population has declined by an estimated 33.3%. Asian residents' share of Marshall County's population has remained roughly unchanged at 0.2%.

Marshall County is more Asian than neighboring Day County (0.1% Asian). Marshall County is less Asian than neighboring Sargent County (0.3% Asian), Roberts County (0.8% Asian), Ransom County (0.7% Asian), and Brown County (2.9% Asian).

Marshall County's Hispanic Population

278 residents of Marshall County, or 6.4% of the population, identify as Hispanic. The share of Hispanic residents in Marshall County is comparable to the share in South Dakota overall, where 4.8% of the population is Hispanic. Marshall County ranks 5th statewide in terms of Hispanic residents as a share of the population, out of 66 counties.

Since the 2020 Census, Marshall County's Hispanic population has grown by an estimated 9.0%. Hispanic residents' share of Marshall County's population has increased from 5.9% to 6.4%.

Marshall County is more Hispanic than neighboring Sargent County (2.9% Hispanic), Day County (2.8% Hispanic), Roberts County (2.6% Hispanic), Ransom County (2.7% Hispanic), and Brown County (4.7% Hispanic).

Marshall County's Native American/Other Population

252 residents of Marshall County, or 5.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Marshall County is comparable to the share in South Dakota overall, where 7.5% of the population is Native American/Other. Marshall County ranks 21st statewide in terms of Native American/Other residents as a share of the population, out of 66 counties.

Since the 2020 Census, Marshall County's Native American/Other population has declined by an estimated 22.5%. Native American/Other residents' share of Marshall County's population has decreased from 7.5% to 5.8%.

Marshall County is more Native American/Other than neighboring Sargent County (0.3% Native American/Other), Ransom County (0.3% Native American/Other), and Brown County (3% Native American/Other). Marshall County is less Native American/Other than neighboring Day County (9.9% Native American/Other), and Roberts County (34.6% Native American/Other).

Marshall County's Multiracial Population

165 residents of Marshall County, or 3.8% of the population, identify as Multiracial. The share of Multiracial residents in Marshall County is comparable to the share in South Dakota overall, where 4.4% of the population is Multiracial. Marshall County ranks 44th statewide in terms of Multiracial residents as a share of the population, out of 66 counties.

Since the 2020 Census, Marshall County's Multiracial population has grown by an estimated 51.4%. Multiracial residents' share of Marshall County's population has increased from 2.5% to 3.8%.

Marshall County is more Multiracial than neighboring Sargent County (3.7% Multiracial), Ransom County (3.4% Multiracial), and Brown County (3.4% Multiracial). Marshall County is less Multiracial than neighboring Day County (4.2% Multiracial), and Roberts County (5.2% 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.