Sullivan County, Indiana Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 69th-largest in Indiana

The population of Sullivan County, Indiana is 20,766 as of the 2023 American Community Survey, making it the 69th-largest county in Indiana. The median household income is $54,985, the median home value is $122,200, and the median age is 41.3.

The population of Sullivan County has declined 2.9% since 2010 (21,387 → 20,768), a -0.21% annualized rate.

Sullivan County within Indiana · Source: US Census TIGER/Line via us-atlas

20,766

Population

-0.21%

Annual growth

People / sq mi

$54,985

Median Income

$122,200

Median Home Value

Sullivan County covers 447 sq mi of land at 46.4 people per square mile.

About Sullivan County, IN

Sullivan County is a county in Indiana with a population of 20,766. It ranks #69 among counties in Indiana by population. The median age is 41.3, older than the national median. The population is 54.4% male and 45.6% female.

The median household income in Sullivan County is $54,985, below the US median of $74,580. 10.0% of residents live below the federal poverty level. Home values sit at a median of $122,200, with monthly rent averaging $813. The homeownership rate of 75.6% is higher than the national rate of 64.8%.

Educational attainment in Sullivan County reflects 14.3% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 3.4% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 24.9 minutes each way.

Sullivan County Population History (2010-2024)

The county of Sullivan County had a population of 21,387 in 2010 and 20,768 in 2024, a -2.9% growth over 14 years. The peak was 21,387 in 2010. Average annual growth rate: -0.21%.

20,768

Population (2024)

21,387

Population (2010)

21,387

Peak (2010)

-0.21%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	21,387	-	-	estimate
2011	21,216	-171	-0.80%	estimate
2012	21,202	-14	-0.07%	estimate
2013	21,138	-64	-0.30%	estimate
2014	20,994	-144	-0.68%	estimate
2015	20,874	-120	-0.57%	estimate
2016	20,695	-179	-0.86%	estimate
2017	20,690	-5	-0.02%	estimate
2018	20,673	-17	-0.08%	estimate
2019	20,601	-72	-0.35%	estimate
2020	20,819	+218	+1.06%	estimate
2021	20,787	-32	-0.15%	estimate
2022	20,702	-85	-0.41%	estimate
2023	20,822	+120	+0.58%	estimate
2024	20,768	-54	-0.26%	estimate

Race & Ethnicity

White	91.1%
Black or African American	3.4%
Asian	0.0%
Hispanic or Latino (any race)	1.7%
Two or More Races	0.0%

Age & Sex

41.3

Median Age

45.6%

Female

54.4%

Male

18.5%

Age 65+

Age Distribution

Under 5

5.3%

5–9

4.8%

10–14

5.9%

15–19

5.0%

20–24

6.1%

25–34

13.9%

35–44

13.6%

45–54

13.5%

55–59

6.2%

60–64

7.3%

65–74

11.0%

75–84

5.4%

85+

2.1%

Children (under 15): 16.0% · Seniors (65+): 18.5%

Income & Poverty

Median household income	$54,985$-15,066 vs state
Mean household income	$74,197
Per-capita income	$29,424
Poverty rate	10.0%+1.6% vs state
Unemployment rate	2.7%
Employment-to-population	51.3%

Top Industries by Employment

Professional & business services

20.6%

Manufacturing

17.5%

Agriculture

7.2%

Construction

6.9%

Education & health care

6.5%

Retail trade

6.2%

Public administration

6.2%

Arts, entertainment & food

6.0%

The largest employment sector in Sullivan County is professional & business services, accounting for 20.6% of workers.

How residents commute

0.0%

Drive alone

1.2%

Carpool

84.5%

Public transit

3.4%

Work from home

24.9 min

Avg commute

Housing

$122,200$-79,400 vs state

Median home value

$813

Median rent

75.6%

Homeownership rate

8,798

Total housing units

87.5%

Occupied

12.5%

Vacant

24.4%

Renter-occupied

Social & access

93.2%

With health insurance

90.8%

With broadband internet

18.4%

Foreign-born

8.5%

Veterans (18+)

17.4%

With a disability

98.4%

Speak language other than English at home

Education

88.1%

High School+

14.3%

Bachelor's+

Largest cities in Indiana

Indianapolis (882,043)Fort Wayne (266,235)Evansville (116,441)South Bend (102,866)Fishers (100,918)Carmel (100,501)Bloomington (78,791)Hammond (77,098)Noblesville (71,940)Lafayette (70,650)All Indiana cities →

Other counties in Indiana

Marion County (971,822)Lake County (498,990)Allen County (388,791)Hamilton County (357,176)St. Joseph County (272,574)Elkhart County (206,868)Tippecanoe County (187,399)Vanderburgh County (179,908)Hendricks County (179,379)Porter County (174,150)All Indiana counties →

Part of Indiana

Indiana demographic profile All Indiana data →

Metro areas in Indiana

Chicago (9,359,555)Cincinnati (2,255,257)Indianapolis (2,106,327)Louisville/Jefferson County (1,361,847)Fort Wayne (451,440)South Bend (324,180)Evansville (269,721)Lafayette (225,019)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All rankings →

Frequently Asked Questions

Sullivan County, Indiana has a population of 20,766 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 69th-largest county in Indiana. Population density is 46 people per square mile.

The population of Sullivan County has declined 2.9% since 2010 (21,387 → 20,768), a -0.21% annualized rate.

The median household income in Sullivan County, Indiana is $54,985, with mean (average) household income of $74,197 and per-capita income of $29,424. 10.0% of residents live below the federal poverty level.

In Sullivan County, the largest racial and ethnic groups are White (91.1%), Black or African American (3.4%), Hispanic or Latino (1.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.

The median age in Sullivan County, Indiana is 41.3 years. Residents are 45.6% female and 54.4% male.

The median home value in Sullivan County is $122,200 and median monthly rent is $813. 75.6% of occupied housing units are owner-occupied. The county has 8,798 total housing units, 12.5% of which are vacant.

The largest employment sector in Sullivan County, Indiana is professional, scientific, and management services, employing 20.6% of workers. The unemployment rate is 2.7%.

Indianapolis is among the largest cities associated with Sullivan County, Indiana, with a population of 882,043.