Jefferson County, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 7th-largest in Missouri
The population of Jefferson County, Missouri is 228,227 as of the 2023 American Community Survey, making it the 7th-largest county in Missouri. The median household income is $80,522, the median home value is $218,800, and the median age is 40.2.
The population of Jefferson County has grown 5.8% since 2010 (219,130 → 231,888), a +0.41% annualized rate.
228,227
Population
+0.41%
Annual growth
348
People / sq mi
$80,522
Median Income
$218,800
Median Home Value
Jefferson County covers 656 sq mi of land at 347.8 people per square mile.
About Jefferson County, MO
Jefferson County is a county in Missouri with a population of 228,227. It ranks #7 among counties in Missouri by population. The median age is 40.2, older than the national median. The population is 50.0% male and 50.0% female.
The median household income in Jefferson County is $80,522, above the US median of $74,580. 5.7% of residents live below the federal poverty level. Home values sit at a median of $218,800, with monthly rent averaging $972. The homeownership rate of 81.4% is higher than the national rate of 64.8%.
Educational attainment in Jefferson County reflects 23.6% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 10.1% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 30.4 minutes each way.
Jefferson County Population History (2010-2024)
The county of Jefferson County had a population of 219,130 in 2010 and 231,888 in 2024, a 5.8% growth over 14 years. The peak was 231,888 in 2024. Average annual growth rate: 0.41%.
231,888
Population (2024)
219,130
Population (2010)
231,888
Peak (2024)
0.41%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 219,130 |
| 2011 | 219,605 |
| 2012 | 219,885 |
| 2013 | 220,923 |
| 2014 | 222,066 |
| 2015 | 223,185 |
| 2016 | 223,439 |
| 2017 | 223,843 |
| 2018 | 224,656 |
| 2019 | 225,402 |
| 2020 | 226,947 |
| 2021 | 228,030 |
| 2022 | 229,268 |
| 2023 | 231,155 |
| 2024 | 231,888 |
Race & Ethnicity
| White | 90.0% |
| Black or African American | 1.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Age & Sex
40.2
Median Age
50.0%
Female
50.0%
Male
16.1%
Age 65+
Age Distribution
Children (under 15): 18.6% · Seniors (65+): 16.1%
Income & Poverty
| Median household income | $80,522+$11,602 vs state |
| Mean household income | $96,337 |
| Per-capita income | $37,869 |
| Poverty rate | 5.7%-2.7% vs state |
| Unemployment rate | 2.4% |
| Employment-to-population | 63.8% |
Top Industries by Employment
The largest employment sector in Jefferson County is professional & business services, accounting for 21.8% of workers.
How residents commute
0.1%
Drive alone
0.7%
Carpool
81.0%
Public transit
10.1%
Work from home
30.4 min
Avg commute
Housing
$218,800+$3,200 vs state
Median home value
$972
Median rent
81.4%
Homeownership rate
93,276
Total housing units
93.3%
Occupied
6.7%
Vacant
18.6%
Renter-occupied
Social & access
92.7%
With health insurance
95.1%
With broadband internet
17.7%
Foreign-born
7.9%
Veterans (18+)
13.3%
With a disability
96.7%
Speak language other than English at home
Education
91.5%
High School+
23.6%
Bachelor's+
Largest cities in Missouri
Other counties in Missouri
Part of Missouri
Metro areas in Missouri
County rankings
Frequently Asked Questions
Jefferson County, Missouri has a population of 228,227 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 7th-largest county in Missouri. Population density is 348 people per square mile.
The population of Jefferson County has grown 5.8% since 2010 (219,130 → 231,888), a +0.41% annualized rate.
The median household income in Jefferson County, Missouri is $80,522, with mean (average) household income of $96,337 and per-capita income of $37,869. 5.7% of residents live below the federal poverty level.
In Jefferson County, the largest racial and ethnic groups are White (90.0%), Black or African American (1.1%), Hispanic or Latino (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Jefferson County, Missouri is 40.2 years. Residents are 50.0% female and 50.0% male.
The median home value in Jefferson County is $218,800 and median monthly rent is $972. 81.4% of occupied housing units are owner-occupied. The county has 93,276 total housing units, 6.7% of which are vacant.
The largest employment sector in Jefferson County, Missouri is professional, scientific, and management services, employing 21.8% of workers. The unemployment rate is 2.4%.
Kansas City is among the largest cities associated with Jefferson County, Missouri, with a population of 508,233.
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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.