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
Homeownership is the standout figure in Jefferson County: 81.4% of homes are owner-occupied, higher than the national rate. Jefferson County is a county in Missouri with a population of 228,227. It is the #7-largest of all counties in Missouri nationally.
Median household income is $80,522, near the US median of $78,538. The poverty rate, 5.7%, is on the lower side for US counties and below the national 12.4%. The typical home is valued at $218,800, with typical rent around $972.
Degree attainment is mid-range for US counties: 23.6% of adults hold a four-year degree, below the national 35.0%. Around 10.1% of workers work from home, below the national 14.0%, and the average commute runs about 30 minutes each way.
The ownership rate anchors the housing story in Jefferson County, and tends to move with the age structure and home-value figures above.
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.
Jefferson County, MO Climate
Jefferson County, MO has an average annual temperature of 12.7°C (55°F) and receives about 992 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
12.7°C
Avg Temp
992
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -1° / 30° | 53 mm |
| February | 2° / 35° | 55 mm |
| March | 7° / 45° | 95 mm |
| April | 13° / 55° | 94 mm |
| May | 18° / 64° | 108 mm |
| June | 23° / 73° | 87 mm |
| July | 25° / 77° | 85 mm |
| August | 24° / 76° | 85 mm |
| September | 20° / 68° | 84 mm |
| October | 14° / 57° | 72 mm |
| November | 7° / 45° | 92 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 Jefferson County, MO
The most comfortable months to visit Jefferson County, MO 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 Jefferson County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.