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
Remote work is unusually prominent in Knox County: 22.3% of workers primarily work from home, above the 14.0% national rate. Knox County is a county in Missouri with a population of 3,760.
Earnings trail the nation, with the median household making $53,333, below the US median of $78,538. Poverty runs at 7.1%, below the national 12.4%. Real estate is inexpensive, with a typical home worth only $97,200, with typical rent around $661.
Degree attainment is on the lower side for US counties: 16.9% of adults hold a bachelor’s degree, below the national 35.0%. Working from home is common here: 22.3% of workers do so, above the national 14.0%, and the average commute runs about 21 minutes each way.
The remote-work concentration is telling in Knox County — it skews toward higher-income, college-educated workers and reshapes both commute patterns and housing demand.
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.
Knox County, MO Climate
Knox County, MO has an average annual temperature of 11.1°C (52°F) and receives about 958 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.1°C
Avg Temp
958
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -4° / 24° | 38 mm |
| February | -1° / 29° | 32 mm |
| March | 5° / 41° | 69 mm |
| April | 11° / 53° | 86 mm |
| May | 17° / 63° | 112 mm |
| June | 22° / 72° | 99 mm |
| July | 25° / 77° | 108 mm |
| August | 24° / 74° | 99 mm |
| September | 19° / 66° | 115 mm |
| October | 13° / 55° | 86 mm |
| November | 5° / 41° | 64 mm |
| December | -1° / 29° | 50 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, MO
The most comfortable months to visit Knox County, MO are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -9°C low). September is usually the wettest month.
Where to stay near Knox County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.