Washington County, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 47th-largest in Missouri
The population of Washington County, Missouri is 23,483 as of the 2023 American Community Survey, making it the 47th-largest county in Missouri. The median household income is $51,886, the median home value is $118,400, and the median age is 40.2.
The population of Washington County has declined 6.4% since 2010 (25,198 → 23,583), a -0.47% annualized rate.
23,483
Population
-0.47%
Annual growth
31
People / sq mi
$51,886
Median Income
$118,400
Median Home Value
Washington County covers 760 sq mi of land at 30.9 people per square mile.
About Washington County, MO
Washington County is a county in Missouri with a population of 23,483. It ranks #47 among counties in Missouri by population. The median age is 40.2, older than the national median. The population is 51.8% male and 48.2% female.
The median household income in Washington County is $51,886, below the US median of $74,580. 15.2% of residents live below the federal poverty level. Home values sit at a median of $118,400, with monthly rent averaging $680. The homeownership rate of 76.3% is higher than the national rate of 64.8%.
Educational attainment in Washington County reflects 12.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 3.0% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 35.9 minutes each way.
Washington County Population History (2010-2024)
The county of Washington County had a population of 25,198 in 2010 and 23,583 in 2024, a -6.4% growth over 14 years. The peak was 25,198 in 2010. Average annual growth rate: -0.46%.
23,583
Population (2024)
25,198
Population (2010)
25,198
Peak (2010)
-0.46%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 25,198 |
| 2011 | 25,106 |
| 2012 | 25,088 |
| 2013 | 25,145 |
| 2014 | 25,078 |
| 2015 | 24,795 |
| 2016 | 24,847 |
| 2017 | 25,000 |
| 2018 | 24,900 |
| 2019 | 24,743 |
| 2020 | 23,432 |
| 2021 | 23,403 |
| 2022 | 23,389 |
| 2023 | 23,542 |
| 2024 | 23,583 |
Race & Ethnicity
| White | 92.3% |
| Black or African American | 1.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.2% |
| Two or More Races | 0.0% |
Age & Sex
40.2
Median Age
48.2%
Female
51.8%
Male
17.4%
Age 65+
Age Distribution
Children (under 15): 19.1% · Seniors (65+): 17.4%
Income & Poverty
| Median household income | $51,886$-17,034 vs state |
| Mean household income | $75,326 |
| Per-capita income | $28,855 |
| Poverty rate | 15.2%+6.8% vs state |
| Unemployment rate | 1.9% |
| Employment-to-population | 48.6% |
Top Industries by Employment
The largest employment sector in Washington County is professional & business services, accounting for 23.3% of workers.
How residents commute
0.0%
Drive alone
0.8%
Carpool
83.3%
Public transit
3.0%
Work from home
35.9 min
Avg commute
Housing
$118,400$-97,200 vs state
Median home value
$680
Median rent
76.3%
Homeownership rate
10,736
Total housing units
82.6%
Occupied
17.4%
Vacant
23.7%
Renter-occupied
Social & access
88.6%
With health insurance
88.1%
With broadband internet
16.1%
Foreign-born
8.5%
Veterans (18+)
23.7%
With a disability
98.2%
Speak language other than English at home
Education
83.2%
High School+
12.4%
Bachelor's+
Largest cities in Missouri
Other counties in Missouri
Part of Missouri
Metro areas in Missouri
County rankings
Frequently Asked Questions
Washington County, Missouri has a population of 23,483 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 47th-largest county in Missouri. Population density is 31 people per square mile.
The population of Washington County has declined 6.4% since 2010 (25,198 → 23,583), a -0.47% annualized rate.
The median household income in Washington County, Missouri is $51,886, with mean (average) household income of $75,326 and per-capita income of $28,855. 15.2% of residents live below the federal poverty level.
In Washington County, the largest racial and ethnic groups are White (92.3%), Black or African American (1.9%), Hispanic or Latino (1.2%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Washington County, Missouri is 40.2 years. Residents are 48.2% female and 51.8% male.
The median home value in Washington County is $118,400 and median monthly rent is $680. 76.3% of occupied housing units are owner-occupied. The county has 10,736 total housing units, 17.4% of which are vacant.
The largest employment sector in Washington County, Missouri is professional, scientific, and management services, employing 23.3% of workers. The unemployment rate is 1.9%.
Kansas City is among the largest cities associated with Washington 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.