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
Remote work is unusually rare in Knox County: 2.0% of workers primarily work from home, below the 14.0% national rate. Knox County is a county in Indiana with a population of 36,108. It ranks #43 among counties in Indiana by population.
Household earnings are middling, with a median of $58,863 — below the US median of $78,538. Poverty runs at 9.6%, below the national 12.4%. Housing is relatively affordable, with a median home value of $123,500, with typical rent around $782.
College attainment is 17.8%, below the national 35.0%. Almost everyone commutes — only 2.0% work from home, below the national 14.0%, and the average commute runs about 20 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.
Knox County, IN Climate
Knox County, IN has an average annual temperature of 12.5°C (55°F) and receives about 1131 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
12.5°C
Avg Temp
1131
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -2° / 29° | 64 mm |
| February | 1° / 33° | 65 mm |
| March | 7° / 44° | 101 mm |
| April | 13° / 55° | 110 mm |
| May | 18° / 65° | 129 mm |
| June | 23° / 73° | 104 mm |
| July | 25° / 77° | 117 mm |
| August | 24° / 75° | 97 mm |
| September | 20° / 68° | 77 mm |
| October | 14° / 57° | 80 mm |
| November | 7° / 45° | 105 mm |
| December | 1° / 34° | 82 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Knox County, IN
The most comfortable months to visit Knox County, IN are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -6°C low). May is usually the wettest month.
Where to stay near Knox County
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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.