Knox County, Indiana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 43rd-largest in Indiana
The population of Knox County, Indiana is 36,108 as of the 2023 American Community Survey, making it the 43rd-largest county in Indiana. The median household income is $58,863, the median home value is $123,500, and the median age is 39.1.
The population of Knox County has declined 6.6% since 2010 (38,394 → 35,872), a -0.48% annualized rate.
36,108
Population
-0.48%
Annual growth
70
People / sq mi
$58,863
Median Income
$123,500
Median Home Value
Knox County covers 516 sq mi of land at 70.0 people per square mile.
About Knox County, IN
Knox County is a county in Indiana with a population of 36,108. It ranks #43 among counties in Indiana by population. The median age is 39.1, in line with the national median. The population is 50.8% male and 49.2% female.
The median household income in Knox County is $58,863, below the US median of $74,580. 9.6% of residents live below the federal poverty level. Home values sit at a median of $123,500, with monthly rent averaging $782. The homeownership rate of 65.9% is close to the national rate of 64.8%.
Educational attainment in Knox County reflects 17.8% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 2.0% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 20.1 minutes each way.
Knox County Population History (2010-2024)
The county of Knox County had a population of 38,394 in 2010 and 35,872 in 2024, a -6.6% growth over 14 years. The peak was 38,479 in 2011. Average annual growth rate: -0.48%.
35,872
Population (2024)
38,394
Population (2010)
38,479
Peak (2011)
-0.48%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 38,394 |
| 2011 | 38,479 |
| 2012 | 37,986 |
| 2013 | 38,070 |
| 2014 | 37,979 |
| 2015 | 37,784 |
| 2016 | 37,367 |
| 2017 | 37,070 |
| 2018 | 36,602 |
| 2019 | 36,603 |
| 2020 | 36,257 |
| 2021 | 35,982 |
| 2022 | 35,895 |
| 2023 | 36,027 |
| 2024 | 35,872 |
Race & Ethnicity
| White | 90.5% |
| Black or African American | 1.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.1% |
| Two or More Races | 0.0% |
Age & Sex
39.1
Median Age
49.2%
Female
50.8%
Male
18.5%
Age 65+
Age Distribution
Children (under 15): 17.7% · Seniors (65+): 18.5%
Income & Poverty
| Median household income | $58,863$-11,188 vs state |
| Mean household income | $80,327 |
| Per-capita income | $33,762 |
| Poverty rate | 9.6%+1.2% vs state |
| Unemployment rate | 1.6% |
| Employment-to-population | 61.4% |
Top Industries by Employment
The largest employment sector in Knox County is professional & business services, accounting for 27.4% of workers.
How residents commute
0.3%
Drive alone
3.7%
Carpool
84.9%
Public transit
2.0%
Work from home
20.1 min
Avg commute
Housing
$123,500$-78,100 vs state
Median home value
$782
Median rent
65.9%
Homeownership rate
16,965
Total housing units
89.1%
Occupied
10.9%
Vacant
34.1%
Renter-occupied
Social & access
93.1%
With health insurance
91.8%
With broadband internet
17.0%
Foreign-born
6.2%
Veterans (18+)
18.1%
With a disability
96.1%
Speak language other than English at home
Education
90.1%
High School+
17.8%
Bachelor's+
Largest cities in Indiana
Other counties in Indiana
Part of Indiana
Metro areas in Indiana
County rankings
Frequently Asked Questions
Knox County, Indiana has a population of 36,108 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 43rd-largest county in Indiana. Population density is 70 people per square mile.
The population of Knox County has declined 6.6% since 2010 (38,394 → 35,872), a -0.48% annualized rate.
The median household income in Knox County, Indiana is $58,863, with mean (average) household income of $80,327 and per-capita income of $33,762. 9.6% of residents live below the federal poverty level.
In Knox County, the largest racial and ethnic groups are White (90.5%), Hispanic or Latino (2.1%), Black or African American (1.6%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Knox County, Indiana is 39.1 years. Residents are 49.2% female and 50.8% male.
The median home value in Knox County is $123,500 and median monthly rent is $782. 65.9% of occupied housing units are owner-occupied. The county has 16,965 total housing units, 10.9% of which are vacant.
The largest employment sector in Knox County, Indiana is professional, scientific, and management services, employing 27.4% of workers. The unemployment rate is 1.6%.
Indianapolis is among the largest cities associated with Knox County, Indiana, with a population of 882,043.
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Full rankings of Indiana counties
Statewide data for Indiana
Population, race, income, age, and trends across Indiana
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.