Knox County, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 113th-largest in Missouri
The population of Knox County, Missouri is 3,760 as of the 2023 American Community Survey, making it the 113th-largest county in Missouri. The median household income is $53,333, the median home value is $97,200, and the median age is 39.8.
The population of Knox County has declined 9.3% since 2010 (4,125 → 3,740), a -0.70% annualized rate.
3,760
Population
-0.70%
Annual growth
7
People / sq mi
$53,333
Median Income
$97,200
Median Home Value
Knox County covers 504 sq mi of land at 7.5 people per square mile.
About Knox County, MO
Knox County is a county in Missouri with a population of 3,760. It ranks #113 among counties in Missouri by population. The median age is 39.8, in line with the national median. The population is 50.9% male and 49.1% female.
The median household income in Knox County is $53,333, below the US median of $74,580. 7.1% of residents live below the federal poverty level. Home values sit at a median of $97,200, with monthly rent averaging $661. The homeownership rate of 85.9% is higher than the national rate of 64.8%.
Educational attainment in Knox County reflects 16.9% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 22.3% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 21.2 minutes each way.
Knox County Population History (2010-2024)
The county of Knox County had a population of 4,125 in 2010 and 3,740 in 2024, a -9.3% growth over 14 years. The peak was 4,126 in 2011. Average annual growth rate: -0.68%.
3,740
Population (2024)
4,125
Population (2010)
4,126
Peak (2011)
-0.68%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 4,125 |
| 2011 | 4,126 |
| 2012 | 4,091 |
| 2013 | 4,060 |
| 2014 | 3,994 |
| 2015 | 3,907 |
| 2016 | 3,929 |
| 2017 | 3,971 |
| 2018 | 3,943 |
| 2019 | 3,957 |
| 2020 | 3,739 |
| 2021 | 3,786 |
| 2022 | 3,777 |
| 2023 | 3,736 |
| 2024 | 3,740 |
Race & Ethnicity
| White | 95.3% |
| Black or African American | 0.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.2% |
| Two or More Races | 0.0% |
Age & Sex
39.8
Median Age
49.1%
Female
50.9%
Male
21.0%
Age 65+
Age Distribution
Children (under 15): 20.6% · Seniors (65+): 21.0%
Income & Poverty
| Median household income | $53,333$-15,587 vs state |
| Mean household income | $67,196 |
| Per-capita income | $26,225 |
| Poverty rate | 7.1%-1.3% vs state |
| Unemployment rate | 2.2% |
| Employment-to-population | 53.1% |
Top Industries by Employment
The largest employment sector in Knox County is professional & business services, accounting for 22.2% of workers.
How residents commute
2.1%
Drive alone
3.9%
Carpool
65.1%
Public transit
22.3%
Work from home
21.2 min
Avg commute
Housing
$97,200$-118,400 vs state
Median home value
$661
Median rent
85.9%
Homeownership rate
1,940
Total housing units
62.6%
Occupied
37.4%
Vacant
14.1%
Renter-occupied
Social & access
75.6%
With health insurance
75.3%
With broadband internet
29.5%
Foreign-born
10.5%
Veterans (18+)
14.6%
With a disability
98.1%
Speak language other than English at home
Education
82.9%
High School+
16.9%
Bachelor's+
Largest cities in Missouri
Other counties in Missouri
Part of Missouri
Metro areas in Missouri
County rankings
Frequently Asked Questions
Knox County, Missouri has a population of 3,760 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 113th-largest county in Missouri. Population density is 7 people per square mile.
The population of Knox County has declined 9.3% since 2010 (4,125 → 3,740), a -0.70% annualized rate.
The median household income in Knox County, Missouri is $53,333, with mean (average) household income of $67,196 and per-capita income of $26,225. 7.1% of residents live below the federal poverty level.
In Knox County, the largest racial and ethnic groups are White (95.3%), Black or African American (0.9%), Hispanic or Latino (0.2%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Knox County, Missouri is 39.8 years. Residents are 49.1% female and 50.9% male.
The median home value in Knox County is $97,200 and median monthly rent is $661. 85.9% of occupied housing units are owner-occupied. The county has 1,940 total housing units, 37.4% of which are vacant.
The largest employment sector in Knox County, Missouri is professional, scientific, and management services, employing 22.2% of workers. The unemployment rate is 2.2%.
Kansas City is among the largest cities associated with Knox County, Missouri, with a population of 508,233.
More from Missouri
Population 996,618
Population 717,021
Population 409,830
Population 301,121
Full rankings of Missouri counties
Statewide data for Missouri
Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.