Demographics of Sullivan County, Indiana

Sullivan County, Indiana had 20,831 people on July 1, 2025, by the Census Bureau’s estimate: +11 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Sullivan County, in four figures

20,831
Population: July 1, 2025, Vintage 2025 estimate.; +0.1%
Change since July 2020: +11 people.; 41.7 ±0.5
Median age: ACS 2020–⁠2024.; $56,204 ±$4,192
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Sullivan County, Indiana's population grew 0.1% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sullivan County, Indiana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Sullivan County, Indiana's population grew 0.1% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sullivan County, Indiana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	20,820	100.0	100.0
2021	20,783	99.8	100.2
2022	20,664	99.3	100.7
2023	20,714	99.5	101.6
2024	20,693	99.4	102.5
2025	20,831	100.1	103.1

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Population of Sullivan County, Indiana on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	20,820	+1	−6	0	+1
2021	20,783	−37	−66	0	+10
2022	20,664	−119	−45	+10	−75
2023	20,714	+50	−53	0	+106
2024	20,693	−21	−48	−1	+30
2025	20,831	+138	−51	−1	+191

Age, 2020–2024

The median age is 41.7 ±0.5: for men 40.1 ±0.9 and for women 44.8 ±0.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sullivan County by age, ACS 2020–2024
Age	People	Share	Indiana	United States
Under 5	1,014 ±51	4.9% ±0.2	6.0% ±<0.1	5.6% ±<0.1
5 to 17	2,893 ±202	13.9% ±1.0	17.3% ±0.1	16.3% ±<0.1
18 to 24	1,605 ±179	7.7% ±0.9	9.6% ±0.1	9.1% ±<0.1
25 to 44	5,617 ±277	27.0% ±1.3	25.8% ±0.1	26.9% ±<0.1
45 to 64	5,714 ±278	27.5% ±1.3	24.5% ±0.1	24.8% ±<0.1
65 and over	3,937 ±298	18.9% ±1.4	16.8% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $56,204 ±$4,192, and income per person $30,787 ±$1,833, in 2024 dollars. The median is $71,957 ±$352 in Indiana and $80,734 ±$166 in the United States.

Households by income

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Households in Sullivan County by income, ACS 2020–2024
Household income	Households	Share	Indiana	United States
Under $25,000	1,454 ±244	18.6% ±3.1	15.0% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,938 ±288	24.7% ±3.6	19.4% ±0.2	16.7% ±<0.1
$50,000 to $74,999	1,562 ±224	19.9% ±2.8	17.7% ±0.2	15.5% ±<0.1
$75,000 to $99,999	1,103 ±199	14.1% ±2.5	13.9% ±0.2	12.6% ±<0.1
$100,000 to $149,999	815 ±186	10.4% ±2.4	17.5% ±0.2	17.5% ±<0.1
$150,000 to $199,999	683 ±159	8.7% ±2.0	8.3% ±0.1	9.6% ±<0.1
$200,000 or more	277 ±105	3.5% ±1.3	8.2% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Sullivan County by age, ACS 2020–2024
Age	Below poverty	Rate	Indiana	United States
All ages	2,592 ±426	13.9% ±2.3	12.3% ±0.2	12.5% ±0.1
Under 18	752 ±207	19.4% ±5.1	16.0% ±0.3	16.1% ±0.1
18 to 59	1,286 ±235	13.3% ±2.4	11.9% ±0.2	11.6% ±0.1
60 and over	554 ±127	10.7% ±2.4	9.6% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Sullivan County, ACS 2020–2024
Measure	Sullivan County	Indiana	United States
Housing units	8,791 ±31	2,976,568 ±617	143,775,355 ±10,234
Occupied	89.1% ±2.3	91.2% ±0.2	89.9% ±0.1
Vacant	10.9% ±2.3	8.8% ±0.2	10.1% ±0.1
Owner occupied	76.4% ±2.8	70.6% ±0.3	65.2% ±0.3
Renter occupied	23.6% ±2.6	29.4% ±0.3	34.8% ±0.1
Median home value	$131,100 ±$10,580	$218,200 ±$739	$332,700 ±$236
Median gross rent	$829 ±$38	$1,062 ±$5	$1,413 ±$2
Median year built	1973 ±3	1976 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Sullivan County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Indiana	United States
Hispanic or Latino	393 ±0	1.9% ±<0.1	8.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	18,788 ±116	90.4% ±0.6	75.4% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	620 ±104	3.0% ±0.5	9.1% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 161	0% to 0.8%	2.6% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 34	0% to 0.2%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 24	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	8 to 234	< 0.1% to 1.1%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	766 ±141	3.7% ±0.7	3.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Sullivan County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Indiana	United States
Born in the state	16,265 ±564	78.3% ±2.7	67.0% ±0.2	57.3% ±<0.1
Born in another state	4,267 ±559	20.5% ±2.7	25.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	29 to 131	0.1% to 0.6%	0.8% ±<0.1	1.7% ±<0.1
Born abroad	76 to 260	0.4% to 1.3%	6.3% ±0.1	14.1% ±<0.1
Naturalized citizens	27 to 199	0.1% to 1.0%	2.6% ±0.1	7.4% ±<0.1
Not citizens	20 to 90	0.1% to 0.4%	3.7% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Sullivan County among the counties of Indiana

69th of 92 by population, July 2025. Every one is listed on the Indiana page.

Counties of Indiana near Sullivan County in population, July 2025
County	July 2025	Change since 2020
Randolph County	24,438	+0.1%
Fayette County	23,533	+0.7%
Starke County	23,425	+0.1%
Franklin County	23,286	+2.2%
Owen County	21,886	+2.6%
Sullivan County	20,831	+0.1%
Carroll County	20,655	+1.6%
Jay County	20,118	−1.8%
Fulton County	20,091	−1.9%
Spencer County	20,061	+1.2%
Orange County	19,834	−0.1%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026