Sullivan County Demographics

A map of Sullivan County's Population by Race

Sullivan County, Indiana has an estimated population of 20,780, a less than 1% change from the 20,817 recorded in the 2020 Census. The population is 90.4% White, 3.7% Multiracial, 3.0% Black, 1.9% Hispanic, 0.6% Native American/Other, and 0.4% Asian. This demographic dot map shows the population of Sullivan County, with one dot drawn for each person counted by the Census, color-coded by race.

Sullivan is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Indiana overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Sullivan County, that probability was 17.6% in 2020 and 18.0% in the most recent ACS estimates.

Sullivan County is ranked the 69th most populous county in Indiana, out of 92 counties. Sullivan County was ranked the 69th most populous county in the 2020 Census.

Sullivan County's White Population

18,788 residents of Sullivan County, or 90.4% of the population, identify as White. The share of White residents in Sullivan County is considerably higher than in Indiana overall, where 75.4% of the population is White. Sullivan County ranks 49th statewide in terms of White residents as a share of the population, out of 92 counties.

Since the 2020 Census, Sullivan County's White population has remained roughly the same. White residents' share of Sullivan County's population has remained roughly unchanged at 90.4%.

Sullivan County is more White than neighboring Vigo County (84% White), Crawford County (90.3% White), and Knox County (89.4% White). Sullivan County is less White than neighboring Clay County (94% White), and Clark County (95% White).

Sullivan County's Black Population

620 residents of Sullivan County, or 3.0% of the population, identify as Black. The share of Black residents in Sullivan County is lower than in Indiana overall, where 9.1% of the population is Black. Sullivan County ranks 20th statewide in terms of Black residents as a share of the population, out of 92 counties.

Since the 2020 Census, Sullivan County's Black population has declined by an estimated 29.3%. Black residents' share of Sullivan County's population has decreased from 4.2% to 3.0%.

Sullivan County is more Black than neighboring Knox County (1.7% Black), Clay County (0.5% Black), and Clark County (0.5% Black). Sullivan County is less Black than neighboring Vigo County (5.8% Black), and Crawford County (3.4% Black).

Sullivan County's Asian Population

80 residents of Sullivan County, or 0.4% of the population, identify as Asian. The share of Asian residents in Sullivan County is slightly lower than in Indiana overall, where 2.6% of the population is Asian. Sullivan County ranks 90th statewide in terms of Asian residents as a share of the population, out of 92 counties.

Since the 2020 Census, Sullivan County's Asian population has grown by an estimated 142.4%. Asian residents' share of Sullivan County's population has remained roughly unchanged at 0.4%.

Sullivan County is more Asian than neighboring Crawford County (0.2% Asian), and Clark County (0.1% Asian). Sullivan County is less Asian than neighboring Vigo County (2.1% Asian), and Knox County (0.9% Asian).

Sullivan County's Hispanic Population

393 residents of Sullivan County, or 1.9% of the population, identify as Hispanic. The share of Hispanic residents in Sullivan County is lower than in Indiana overall, where 8.6% of the population is Hispanic. Sullivan County ranks 75th statewide in terms of Hispanic residents as a share of the population, out of 92 counties.

Since the 2020 Census, Sullivan County's Hispanic population has grown by an estimated 17.7%. Hispanic residents' share of Sullivan County's population has remained roughly unchanged at 1.9%.

Sullivan County is less Hispanic than neighboring Vigo County (3.2% Hispanic), Crawford County (2.7% Hispanic), Knox County (3% Hispanic), and Clay County (2% Hispanic).

Sullivan County's Native American/Other Population

133 residents of Sullivan County, or 0.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Sullivan County is comparable to the share in Indiana overall, where 0.5% of the population is Native American/Other. Sullivan County ranks 65th statewide in terms of Native American/Other residents as a share of the population, out of 92 counties.

Since the 2020 Census, Sullivan County's Native American/Other population has grown by an estimated 68.4%. Native American/Other residents' share of Sullivan County's population has remained roughly unchanged at 0.6%.

Sullivan County is more Native American/Other than neighboring Knox County (0.2% Native American/Other), Clay County (0.2% Native American/Other), and Clark County (0% Native American/Other).

Sullivan County's Multiracial Population

766 residents of Sullivan County, or 3.7% of the population, identify as Multiracial. The share of Multiracial residents in Sullivan County is comparable to the share in Indiana overall, where 3.8% of the population is Multiracial. Sullivan County ranks 49th statewide in terms of Multiracial residents as a share of the population, out of 92 counties.

Since the 2020 Census, Sullivan County's Multiracial population has grown by an estimated 20.1%. Multiracial residents' share of Sullivan County's population has increased from 3.1% to 3.7%.

Sullivan County is more Multiracial than neighboring Crawford County (2.8% Multiracial), Clay County (2.9% Multiracial), and Clark County (2.5% Multiracial). Sullivan County is less Multiracial than neighboring Vigo County (4.4% Multiracial), and Knox County (4.8% 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.