Lyman County Demographics

A map of Lyman County's Population by Race

Lyman County, South Dakota has an estimated population of 3,724, a less than 1% change from the 3,718 recorded in the 2020 Census. The population is 57.1% White, 39.7% Native American/Other, 2.0% Multiracial, 1.2% Hispanic, 0.0% Black, and 0.0% Asian. This demographic dot map shows the population of Lyman County, with one dot drawn for each person counted by the Census, color-coded by race.

Lyman has become less racially diverse since the 2020 Census. It is considerably more 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 Lyman County, that probability was 54.2% in 2020 and 51.6% in the most recent ACS estimates.

Lyman County is ranked the 43rd most populous county in South Dakota, out of 66 counties. Lyman County was ranked the 43rd most populous county in the 2020 Census.

Lyman County's White Population

2,127 residents of Lyman County, or 57.1% of the population, identify as White. The share of White residents in Lyman County is significantly lower than in South Dakota overall, where 79.8% of the population is White. Lyman County ranks 57th statewide in terms of White residents as a share of the population, out of 66 counties.

Since the 2020 Census, Lyman County's White population has grown by an estimated 11.1%. White residents' share of Lyman County's population has increased from 51.5% to 57.1%.

Lyman County is more White than neighboring Buffalo County (17.5% White). Lyman County is less White than neighboring Hughes County (80.2% White), Tripp County (79.9% White), Hyde County (86.1% White), and Brule County (81.2% White).

Lyman County's Black Population

1 residents of Lyman County, or 0.0% of the population, identify as Black. The share of Black residents in Lyman County is slightly lower than in South Dakota overall, where 2.1% of the population is Black. Lyman County ranks 57th statewide in terms of Black residents as a share of the population, out of 66 counties.

Since the 2020 Census, Lyman County's Black population has declined by an estimated 66.7%. Black residents' share of Lyman County's population has remained roughly unchanged at 0.0%.

Lyman County is less Black than neighboring Hughes County (0.1% Black), Tripp County (0.8% Black), Hyde County (0.3% Black), and Brule County (0.6% Black).

Lyman County's Asian Population

1 residents of Lyman County, or 0.0% of the population, identify as Asian. The share of Asian residents in Lyman County is comparable to the share in South Dakota overall, where 1.4% of the population is Asian. Lyman County ranks 56th statewide in terms of Asian residents as a share of the population, out of 66 counties.

Since the 2020 Census, Lyman County's Asian population has declined by an estimated 75.0%. Asian residents' share of Lyman County's population has remained roughly unchanged at 0.0%.

Lyman County is less Asian than neighboring Hughes County (0.7% Asian), and Tripp County (0.4% Asian).

Lyman County's Hispanic Population

44 residents of Lyman County, or 1.2% of the population, identify as Hispanic. The share of Hispanic residents in Lyman County is slightly lower than in South Dakota overall, where 4.8% of the population is Hispanic. Lyman County ranks 59th statewide in terms of Hispanic residents as a share of the population, out of 66 counties.

Since the 2020 Census, Lyman County's Hispanic population has declined by an estimated 2.2%. Hispanic residents' share of Lyman County's population has remained roughly unchanged at 1.2%.

Lyman County is less Hispanic than neighboring Hughes County (3.3% Hispanic), Tripp County (1.9% Hispanic), Buffalo County (1.7% Hispanic), Hyde County (1.6% Hispanic), and Brule County (2.3% Hispanic).

Lyman County's Native American/Other Population

1,478 residents of Lyman County, or 39.7% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Lyman County is significantly higher than in South Dakota overall, where 7.5% of the population is Native American/Other. Lyman County ranks 10th statewide in terms of Native American/Other residents as a share of the population, out of 66 counties.

Since the 2020 Census, Lyman County's Native American/Other population has declined by an estimated 9.2%. Native American/Other residents' share of Lyman County's population has decreased from 43.8% to 39.7%.

Lyman County is more Native American/Other than neighboring Hughes County (10.8% Native American/Other), Tripp County (13.8% Native American/Other), Hyde County (0.9% Native American/Other), and Brule County (10.1% Native American/Other). Lyman County is less Native American/Other than neighboring Buffalo County (79.1% Native American/Other).

Lyman County's Multiracial Population

73 residents of Lyman County, or 2.0% of the population, identify as Multiracial. The share of Multiracial residents in Lyman County is slightly lower than in South Dakota overall, where 4.4% of the population is Multiracial. Lyman County ranks 29th statewide in terms of Multiracial residents as a share of the population, out of 66 counties.

Since the 2020 Census, Lyman County's Multiracial population has declined by an estimated 40.7%. Multiracial residents' share of Lyman County's population has decreased from 3.3% to 2.0%.

Lyman County is more Multiracial than neighboring Buffalo County (1.7% Multiracial). Lyman County is less Multiracial than neighboring Hughes County (5.1% Multiracial), Tripp County (3.1% Multiracial), Hyde County (11.2% Multiracial), and Brule County (5.8% 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.